KGUSS - Buying Guide

Bestselling from KGUSS on Amazon

1. Topping DX3pro+ LDAC Headphone Amplifier - ES9038Q2M XU208 NFCA Bluetooth5.0 Audio Decoder USB/Opt/C...
2. FX-Audio DAC-X6 Mini HiFi 2.0 Digital Audio Decoder DAC Input USB/Coaxial/Optical Output RCA/Headpho...
3. Topping DX1 Mini Stereo DAC Headphone Amplifier Combo - 280mW x2 Powerful Output Two-Stage GAIN Swit...
4. Topping D10s Mini USB DAC CSS XMOS XU208 ES9038Q2M OPA2134 Audio Amplifier Decoder Black
5. Topping DX7 Pro+ DAC HiFi ES9038PRO NFCA Headphone Amp I/V ConversionUSB/Bluetooth5.1/Coax/Opt/AES/I...
6. KGUSS Topping HS02 USB2.0 Audio Isolator withstands up to 1500VDC, USB-B and Type-C Input, USB-A and...
7. KGUSS Mini Audio Component Rack Black Acrylic 2-Layer Rack Aluminium Holders Small Desktop Rack for ...
8. Gustard R26 Discrete R2R DAC - R2R+1Bit XMOS DSD512 PCM768kHz LDAC Balanced K2 Clock Decoder with Re...
9. KGUSS Topping A70Pro Fully Balanced Headphone Amplifier Preamp - 17000mWx2 Output Power, 2 Gain, R2R...
10. Topping E30 II DAC Preamp Audio Decoder- 2xAK4493S Hi-Res XMOS XU208 DAC 32Bit/768kHz DSD512 DSD Dir...

Features

• High-end audio - TOPPING DX3 Pro+ DAC is a high-performance DAC with USB, optical fiber, coaxial, Bluetooth input, Line Out, and headphone amplifier output.
• About Topping DX3 Pro+ - Equipped with the latest QCC5125 chip, it supports LDAC / AAC / SBC / APTX / APTX LL / APTX HD protocols. It uses the ES9038Q2M decoder, supports high-resolution music transmission, and can be played back with clear sound.
• Bluetooth 5.0 - Connect the Bluetooth of the phone, tablet or notebook to DX3Pro+, and connect the power amplifier, active speakers or headphones to the DX3Pro+'s output, then DX3Pro+ becomes your Bluetooth Headphone amp 1 Bluetooth DAC. You can easily enjoy the high quality music and convenience brought by Bluetooth 5.0. If your device supports LDAC transmission, you will get even better experience.
• High performance DAC for media player - Whether it is Apple IOS device, Android device and media player, as long as it supports OTG external sound card, it can be connected to the USB input of DX3Pro+ to make DX3Pro+ be their external high performance DAC.
• DAC+Pre-amplifier application - TOPPING DX3Pro+ has a simple Pre amp function that you can use to adjust the volume. The digital volume ad- justment will not has any imbalance between the left and right channels.
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Features

• Do your headphones need more power? If so, the FX-Audio DAC-X6 may be what you're looking for. This digital audio decoder ensures that every sound, whether in games or music, is delivered with unparalleled clarity. The DAC's versatile inputs and outputs, combined with a headphone amp, make it the perfect companion for the 16 Ohm to 300 Ohm headphones.
• Chipset: The mini amps chip uses TPA6120A2+LM4562NA+SA9123+CS4398+CS8416 to provide strong guarantee for tone input and output.The op amp can be freely replaced and upgraded, so there's actual upgradability with this. At the same time, a relay protectors may protect the headphones and speakers.
• The rear panel has a Type-B USB input, a Toslink optical and a coaxial digital input that can be connected to Computer/PC/TV/X-BOX/PS5/DVD/DCD; Plus the two RCA pre outs to connected to power amplifier, tube vacuum amp, active speaker. The attractive brushed aluminum front panel has a large volume knob and two mini toggle switches - one for power, and the other is a 3way input selector.
• Plug-n-play, No Driver Needed The device is simple to set up and requires no special software, app, or driver installation, as it is a true plug-and-play digital audio adapter. USB input supports 24bit/96kHz and 6bit 192kHz. Optical/Coaxial inputs supports 24bit 192kHz.
• This unit can be your first foray into the world of external DAC and amps. Its simple design gives you just the features you need, plenty of connections and plenty of power, without coloring the audio. It really is a great addition to your PC setup whether you're into music, movies, or gaming.
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Features

• Newest 32bit-AK4493S DAC chip The DX1 uses the newest sub-flagship AK4493S chips of AKM's VELVET Sound technology. The DX1 decodes up to 32-bit/384kHz PCM in a stunning 120dB of dynamic range.
• Powerful Output for IEMs and Full-size headphones With high/low gain options and two outputs (6.35mm and 3.5mm), the DX1 is ready for IEMs, full-size headphones, and everything in between. Despite its small size, it can output up to 280mWx2 @32 and 51mWx2 @300 of power.
• Plug and Play DX1 has a wide range of compatibility: Windows 10, Windows 11, MAC, Linux, IOS, Android can be plug and play, don't need to install a driver. ( Except Windows ASIO applications)
• Discrete LNRD The Discrete LNRD circuit filters out the noise and interference of USB 5V power and provides stable and clean power supply of ultra-low noise reference level for DX1. With this technology, the noise of the DAC part is lower than 2.0uV, and the noise of the AMP part is lower than 1.0uV. Even high sensitive IEMs will not be bothered by noise.
• Pure DAC Function DX1 has Line out with fixed volume, which can be used as a pure DAC with headphone amplifiers, power amplifiers and other devices. Note, please consider the following information before deciding to add to cart. 1. DX1 does not use nfca module 2. The volume of line out is fixed at the maximum and cannot be adjusted 3. The headphone amplifier output and the line output will come out simultaneously
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Features

• Up to DSD256 and PCM384 TOPPING D10s USB DAC is compatible with 16-32bit/44.1-384kHz and DSD64 - DSD256(support both Dop and Native) If you need a DSD configuration guide, please contact the seller HIFI COLLEGE.
• XMOS XU208 and Customized Driver TOPPPING D10s DAC use XMOS XU208 for USB interface and use customized driver which from Thesycon for better compatibility with high resolution audio file especially DSD native.And use ESS ES9038Q2M to make THD+N as low as 0.0002%@1kHz
• Automatic Power On/Off Although the USB port support power after PC has shutdown,D10s still will synchronously power on/off with PC
• Replaceable OP It has OP amp socket,DIYer could change the OP amp to get different sound.Notice:D10's electrical parameters will change if use other OP
• Multiple Applications Connect TOPPING D10s to your active speakers.D10s Provide not only DSD and higher-specification PCM compatibility but also a better sound quality than your computer's built-in sound card or a regular DAC; You can connect D10s's line out to your amplifier/headphone amplifier's input to make D10s one part of your HIFI system You also can connect D10s's coaxial/optical output to your DAC, then D10s serve as a USB interface
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Features

• ESS9038PRO Chip DX7 Pro+ uses ESS SABRE ES9038PRO, with 32bit Hyperstream architecture, and achieves ultra-high performance in the audio field. Each channel of the DX7 Pro+ will be arranged in parallel by 4 conventional balanced channels. This makes the performance of DX8 Pro+ even better.
• Brand New I/V Conversion A brand new I/V conversion circuit is designed for better quality audio reproduction. The unique circuit design provided lower distortion, lower noise while occupying less space. The new circuit is pushed close to the limit of physics so that we are able to squeeze out the last bit of performance of the DAC chip.
• Built-in NFCA Headphone Amp The new DX8 Pro+ has the NFCA circuit optimized for this unit, giving the ultra low noise and distortion. It pairs with high sensitivity IEMs and power hungry high impedance headphones nicely.
• Plug and Play DX7 Pro+ has a wide range of compatibility: Windows 10 and above, MAC, Linux, lOS, Android can be plug and play. DX7 Pro+ uses 2nd generation 8 core XMOS XU208, USB supports up to PCM32bit768kHz and DSD513 native.
• Sound Simulation According to the unique harmonic performance of tubes and transistors, we added the sound simulation function of tubes and transistors to the DX7 Pro+, so that you can hear 4 different performances.
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Features

• Fully Isolated Design The HS02 has a fully isolated design, which does not introduce new interference when the auxiliary power supply is used while the audio signal is isolated from ground loop interference. Say goodbye to the ground loop and hum.
• Switching between two interfaces The HS02 has two input interfaces (including a USB-B and a Type-C) and two output interfaces (including a USB-A and a Type-C), either of which can be selected by an input switch or an output switch. Note: Input is used to connect to the computer, output is used to connect to USB devices.
• High speed is also highly compatible HS02 supports automatic identification of USB2.0 transmission at low speed, full speed, and high speed. The powerful transmission capability is compatible with high resolution audio such as PCM32bit/768kHz and DSD512 Native.
• Ultra Low Latency The Latency is only 0.073us, which fully meets hifi and professional applications' needs.
• Effectively eliminate the noise introduced by the ground loop The noise can be reduced by up to 50dB in real world measurement.
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Features

• Suitable for Most Small Amplifiers The Shelf can fit and suitable for most small HiFi amplifiers, headphone amps, DAC decoders etc.
• Large Weight Capacity Mini design but with large weight capacity about 3kg, can store 2 amplifiers or headphone amplifiers.
• 2 Layers Design More Stable The shelf with 2 layers can store 2 amplifiers, space-saving keep your table more clean and tidy. Stable design keep your amplifier safe all the time.
• Easy to Install Quickly Just install in minutes by yourself, easy and time-saving, round edge corner design to keep you and your amplifier away from scratch.
• Durable Material and Fashion Outlook Durable Acrylic boards and Aluminium Alloy holders make it a fashion look, decorate your amplifiers. All the acrylic boards come with the protective cover without scratch.
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Features

• Dual architecture: Independent R2R 1Bit,support native PCM native DSD and DSD to PCM.
• PCM NOS: Without any digital signal processing,bypassing the volume adjustment,raw PCM stream was decoded by the R2R array directly.
• Native 1Bit DAC,support DSD 512 (via USB)and DSD 1024 (via IIS).The DSD stream decoded by the independent 1 bit convertor without DSD to PCM converting. *Volume is fixed under this mode.
• Streamer/Renderer: Support roon,upnp and more protocols in the future.
• Replace the input signal's clock with precision oscillators (local or external). Interference from the input source's clock is avoided.
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Features

• T'ang-ku-la Module The T'ang-ku-la Module uses a new three-stage feedback circuit. Further reducing noise and high frequency distortion, making the dynamic range rise to an unmatched 147dB new realm. The new technology greatly reduces heat generation, thus greatly improving reliability, extending electronic component life, and reducing thermal noise.
• Ground Loop Noise Disappearing magic When multiple devices are used in combination, ground loop noise may be encountered. A70 Pro adds a GND/LIFT switch, when ground loop noise is encountered switch to LIFT and the noise will disappear.
• Relay volume control A70 Pro uses relays and resistor networks to form R2R volume control module, which provides precise volume control, long service life, and will not deviate even at low volume.
• A Headphone Amp, also a Preamp The A70 Pro drives headphones well, and it can also be used as a preamp. It has the same high performance as the headphone amp mode, with an RCA output impedance of only 50 and an XLR output impedance of only 100 , allowing it to be used with a wide range of input impedance for various power amplifiers. In addition, a full-featured remote control makes operation even easier.
• Expandable inputs The A70 Pro has one set of balanced XLR and one set of single-ended RCA inputs. But with the Ext90 input expansion, you get a total of four balanced XLR and two single-ended RCA inputs.
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Features

• Supports high-resolution audio TOPPING E30 II uses two sub-flagship AK4493S chips of AKM's VELVET Sound technology. AK4493S is an upgraded version of the previous AK4493. Two AK4493S in parallel can achieve better performance and reduction ability than a single chip.
• Coaxial and Optical also has good performance The optical and coaxial input of E30 II supports up to 24bit192kHz audio, which is suitable for digital turntables, disk players, set-top boxes, and game consoles, so that traditional equipment can also give a new sound. The Digital Processing module provides better compatibility than the E30.
• 5V power supply,anytime and anywhere E30 II uses DC5V for power supply, which can easily access almost everywhere. You can power it up by USB port of PC, mobile phone charger or even a power bank. The built-in protection circuit will protect the E30 II and prompt on the screen after connecting to the wrong power supply.
• Discrete LNRD How to solve the noise problem of 5V power supply? The E30 II's answer is the Discrete LNRD circuit (low noise reference driver). The Discrete LNRD circuit filters out the noise of various 5V power input and provides stable power supply of ultra-low noise reference level for E30 II. With this technology, the noise floor of E30 II is lower than 1 .5uV.
• Pure DAC & DAC+Preamp application E30 II is able to fix to maxmum output level so that it can be worked as a pure DAC. E30 II has built-in volume control function that can adjust the volume from -99dB to 0dB by using the remote control, so you are able to directly connect E30 II to power amplifier or active speakers, and control the volume of E30 II through remote control.
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Features

• Excellent Power Supply - Topping p50 match to E50/D50s&D50/D50s+A50.It is a excellent partner to DX3 Pro
• Compatible with Globlal Voltage - 115V for AC 100V-120V 50/60 Hz,230V for AC220V-240V 50/60 Hz
• Low Noise - The sealed toroidal transformer has small magnetic leakage and low noise,which is very suitable for HIFI use.And the transformer is designed to suppress EMC and noise
• High Power Reserve - The 15V modules providesmore than 10000uF capacitors in total,and the 5V modules provides total more than 8000uF capacitors in total;giving the out enough energy reserves
• Linear Regulator - The P50 is regulated with three TPS7A4700 ultralow noise linear regulators.It is capable of high-accuracy,high-precision instrumentation-level applications and HIFI applications,making in the best choice for high-performance analog circuits
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Features

• Supports high-resolution audio The E30 II lite uses AKM's VELVET Sound technology's sub-flagship AK4493S chip. It has won wide acclaim from audio enthusiasts for its outstanding performance and top-notch sound quality. With the AK4493S, the E30 II lite has a dynamic range of up to 121dB and THD <0.0004%. This not only ensures the high accuracy of audio signal restoration but also gives you a live music experience as if you were there.
• Professional performance, instant listening E30 II lite supports playback of audio streams up to DSD512 and PCM768kHz. E30 II lite is widely compatible with operating systems including Windows 10, Windows 11, MAC, Linux and iOS/Android systems. Simply connect the audio source and use E30 II lite immediately. Only the driver installation and setup is required to use ASIO applications on Windows systems*.
• Preamp Mode The E30 II lite is equipped with a built-in volume control function that makes it easy to adjust the volume from -99dB to 0dB using the remote control. The E30 II lite can also be connected directly to an amplifier, pure power amplifiers or active speakers, controlling the volume level through the E30 II lite, allowing you to enjoy music more comfortably.
• Coaxial and Optical The optical and coaxial input of E30 II lite supports up to 24bit/192kHz, which is suitable for digital turntables, CD players, set-top boxes and game consoles, so that traditional equipment can also give a new sound.
• Good partner L30 II headphone amplifier E30 II lite and L30 II have the same design concept, both detailed workmanship and sound quality performance show the high quality of the product. The L30II headphone amplifier can drive most of the headphones on the market and match perfectly. Whether you are a music enthusiast or an everyday user, its excellent sound quality can meet your needs.
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Features

• Portable beats desktop Portable beats desktop. G5 integrates a USB DAC, a Bluetooth DAC, a NFCA headphone amplifier into a portable volume.
• Plug and play G5 has a wide range of compatibility: Windows 10 or above, MAC, Linux, IOS, Android can be plug and play. G5 uses 2nd generation XMOS, USB supports up to PCM32bit768kHz and DSD512 native. The G5 has a built-in 4000mAh battery so that it does not need to reply on the power supply of the mobile phone like other portable DAC/AMP, so it will not reduce the battery life of the mobile phone.
• LDAC 24bit96kHz G5 has the certification of Hi-Res Audio Wireless and LDAC. It uses newest QCC5125 chipset to support LDAC/AAC/SBC/APTX/APTX LL/APTX HD/APTX Adaptive protocol.To get even better sound quality from Bluetooth, we abandon the built-in DAC of QCC5125 and connect its digital signal to ES9068AS to decode. After pairing the G5 with mobile phone/player/tablet by Bluetooth, the headphone is free from the cables. It is not a burden to put the G5 in your pocket, bag, or desktop.
• Suitable for almost all kinds of headphones G5 provides 3 step gain settings, so that high-sensitivity or low-sensitivity headphones can obtain a comfortable gain range; the output level as high as 21Vpp and the output power of 175mW under 300 load are enough to drive high impedance headphones; The <0.3uVrms ultra-low noise and <0.1 output impedance allow sensitive IEMs to perform satisfactorily.
• Built-in NFCA Headphone amp The G5 uses an NFCA module specially modified for portable devices, which can achive large output, low distortion, and good battery life. It pairs with high sensitivity IEMs and power hungry high impedance headphones nicely.
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Features

• Good Sound Quality - With the help of careful design and adjustment, E50 pro- vides a distortion as low as 0.00009% and a dynamic range of 126dB, providing you with perfect sound quality. This also makes E50 suitable for applications: high-fidelity PC-HIFI system, mobile phone/tablet OTG, CD play- er/turntable external DAC, digital broadcastingexternal DAC, TV DAC and so on
• Hearing Is Knowing - TOPPING E50 uses the latest high performance DAC chip ES9068AS. With our excellence in design and engineering, it provides realistic and transparent sound quality.And USB supports DSD512 & PCM768kHz.USB input has the best performance of E50. It uses XMOS 2nd 16-core processor XU216, which brings the support of 32bit768kHz PCM, DSD512 native high-reso- lution audio and MQA full decoding.It have audiophile quality sound,bring you a better hearing feast
• Some upgrades - On the E50, the traditional optical and coaxial input not only supports 24bit192kHz PCM, but also supports Dop DSD64 and MQA rendering.And using CPLD to process the clock and greatly optimize the digital signal, achieved incredible jitter suppression capa- bilities. The use of new technology makes the femtosec- ond crystal and external clock no longer needed to sup- press jitter.And you can choose TRS only, RCA only or TRS+RCA output to meet different usages in the systems
• 5V Power Supply - TOPPING E50 uses a DC5V power supply, which can be easily accessed almost everywhere. You can power it up by USB port of PC, mobile phone charger or even a power bank.(Note: The product does not provide a 5V power adapter.)
• Preamplifier function - E50 has preamplifier function So you can control the output volume on the remote control. This will provide great convenience when connected to a power amplifier or monitor speakers. And also help you leave the budget for a preamplifier
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Features

• Flagship DAC chip AK4499EX, the audio industry's highest performance.
• Low-noise voltage reference power supply The distortion of E70 VELVELVET is as low as-125db and the noise is no higher than 1.3uVrms.
• LDAC 24bit96kHz Bluetooth transmission E70 VELVET has the certification of Hi-Res Audio Wireless and LDAC. It uses the newest QCC5125 chipset to support LDAC/AAC/SBC/aptX/aptX LL/aptX HD/aptX Adaptive protocol by Bluetooth 5.1.
• Widely compatible Newest XU316 supports DSD512&PCM768kHz ,USB input of E70 VELVET has a wide range of compatibility: Windows 10, Windows 11, MAC, Linux, IOS, Android can be plug and play. Only for Windows ASIO applications, you need to install the driver and set it up.
• L70 will be the best headphone amplifier for E70 VELVET L70 and E70 VELVET have fully matched design languages and styles, L70 is suitable for almost all kinds of headphones. The E70 VELVET and L70 can be switched on and off through the 12V Trigger interface, so that the L70 can be synchronized with the automatic or manual on/off of the E70 VELVET.
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Features

• TOPPING D50 III - 3rd Generation Upgraded Version The D50 III uses 2x ES9039Q2M, one for the left channel and another for the right channel,which delivers higher SNR(132dB), higher dynamic range(132dB), and lower distortion(<1.3uVrms) than the D50s. A brand new I/V conversion circuit is designed for better audio reproduction. The D50 III's ability to restore music has reached a new level with its details perfectly displayed.
• LDAC wireless available D50 III is equipped with QCC5125 and Bluetooth 5.1. It is compatible with LDAC/aptX-Adaptive/aptX-HD/AAC/SBC, supporting up to 96kHz/24bit. So that high-quality audio can be transmitted wirelessly to obtain music experience beyond CD level.
• Plug and play D50 III has a wide range of compatibility and applies to various OS such as Windows 10, Windows 11, MAC, Linux and iOS/Android. Only for Windows ASIO applications, you need to install the driver and set it up. The USB hardware is based on XMOS XU316 andThesycon driver (Drivers only for Windows, other OS needn't driver). In addition, the D50 III supports up to PCM768kHz/32bit and DSD512.
• Dual Type-C interface,Fast and stable Use Type-C for signal transmission and power. It is recommended to add an auxiliary power supply for better performance when the D50 III is often fixed on a desktop or connected to a cell phone for use.
• Ten-band PEQ adjustment We develop a brand new PEQ adjustment*that supports ten customizable frequency bands. Topping's brand new PEQ algorithm and desktop software allow you to fine-tune the frequency, gain, and bandwidth of each PEQ band. The software supports the import of target and original curves as well as the compensation of curves using target curves. It can also save multiple profiles for easy switching.*The PEQ function supports up to PCM 192kHz/32bit. This function is supported only for USB input.
• Choose your output mode at will The D50 III has not only RCA output, but also TRS balanced output, which are widely used in the professional field. In addition to the versatile TRS 4V and RCA 2V outputs, the D50 III adds TRS 5V and RCA 2.5V. Adapt more devices when selecting TRS 4V and RCA 2V. Take performance to the next level when selecting TRS 5V and RCA 2.5V.
• Preamplifier function - Desktop speaker companion In addition to the DAC mode, the D50 III also has a preamp mode. In preamp mode, you can adjust the volume at D50 III, maximizing ease of use with active speakers or pure power amplifiers.
• Perfect partner A50 III The D50 III and A50 III have the same design language. This combination has unique metallic aesthetics no matter how it's placed. And they meet the needs of most headphones and active speakers. The A50 III can also be switched on and off with the D50 III via 12V Trigger.
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Features

• TOPPING MX3s DAC/Headphone Amp/Power Amp The TOPPING MX3s is a comprehensive audio solution that combines a DAC, headphone amplifier, and power amplifier. With this versatile system, you can experience your favorite music and movies through a variety of devices, including in-ear monitors, full-sized headphones, and even a 2.1 speaker system.
• Merus Class D amplifier It can output 62W x2 at 10% distortion and 50W x2 at 1% distortion under 4-ohm load. 40W x2 at 10% distortion and 30W x2 at 1% distortion under 8-ohm load.
• Built-in AK4437 DAC The TOPPING MX3s features an AK4437 DAC and is equipped with a Qualcomm Bluetooth chip, the QCC3040, providing exceptional USB, optical, coaxial, and Bluetooth input capabilities. This allows for easy connection of various audio sources, such as computers, set-top boxes, DVD players, smartphones and tablets, making it incredibly versatile.
• Nice Bluetooth performance The TOPPING MX3s supports Bluetooth protocols such as AAC, SBC, aptX, aptX-HD, and aptX Adaptive, achieving transmission distortion below 0.001%. It brings you an exceptional audio experience.
• Subwoofer Output The TOPPING MX3s has a built-in subwoofer output that can be wired for a full 2.1-channel premium listening experience.
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Features

• Two ES9039SPRO chips - Each of the left and right audio channels independently utilizes an ES9039SPRO, providing higher SNR (135dB) , greater dynamic range, and lower distortion (<0.000045% THD+N) compared to the D90SE. Clearer details flow into your ears.
• Advanced CPLD processing - We achieved incredible jitter rejection using CPLD to process the clock signal and optimize the digital signal.Regardless of USB, optical, coaxial, AES input, jitter is as low as -160dB.
• Brand new I/V conversion - A brand new I/V conversion circuit is designed for better quality audio reproduction. The new circuit design provides lower distortion and lower noise while occupying less space. The new circuit is pushed close to the limit of physics so that we are able to squeeze out the last bit of performance of the DAC chip.
• LDAC wireless available - D90 III SABRE is equipped with QCC5125 and Bluetooth 5.1, supports LDAC/aptX-Adaptive/aptX-HD/AAC/SBC. It can support up to 96kHz/24bit, so that high-quality audio can be transmitted wirelessly to obtain music experience beyond CD level.
• Universal compatibility and ease of use - The D90 III is a breeze to use with its wide compatibility range. It supports various operating systems like Windows, Mac, Linux, and iOS/Android. For Windows ASIO, a simple driver setup is all it takes. The device's USB hardware is based on XMOS XU316 and Thesycon drivers, ensuring stability and reliability.
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Features

• TOPPING Pre90 Preamplifier Pre90 adopts full balanced structure, which can handle balanced and single-ended signal processing. The output can be balanced, sin-gle-ended, balanced + single-ended. With the balanced + single-ended two-way input, in addition to the normal preamplifier usetage, Pre90 can be used for "balanced to sin-gle-ended"or "single-ended to balanced"signal conversion.
• Selectable XLR / RCA output The output of Pre90 could be config to XLR only , RCA only or XLR + RCA . Therefore, the amplified signal can be connected to two different amplifiers. Good combination with EXT90 D90.
• Ultra-high Performance NFCA modules Pre90 uses the similar NFCA ( Nested Feedback Composite Amplifier )module from flagship A90 Voltage Current hybrid feedback architecturelong with UHGF ( Ultra High Gain Feedback ) technology provides excellent DC and AC performance. Ultra-low noise of 0.3uv is milesahead of the competition, giving an absurdly high dynamic range of 145db and no audible noise and darkest background.
• Relay volume control A large number of high quality Japanese small signal relayIsed fovolume control of Pre90. Brings the advantages of precise control remote control, longevity, and complete channel balanceIf the volume was set high while turn on or switch in, Pre90 will automatically reduced to a safe volume to avoid your speakers/headphones blown by sudden high volume.
• Ext90 could extend you more inputs A standard Pre90 provide you 1 x RCA and 1 x XLR stereo inputs. But when it working with a Ext90, they could provide totally 2 x RCA and 4 x XLR stereo inputs. This is enough for multi source systems.
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Features

• Flagship performance The D70 Pro SABRE adopts the ES9039SPRO, the flagship 32-bit DAC chip of SABRE redesigned by ESS company. New IV conversion circuitry is designed to give you higher quality audio playback. Bluetooth 5.1 supports LDAC / aptX-Adaptive / aptX HD /aptx / AAC / SBC audio encoding, allowing high quality audio to be transmitted wirelessly for a better sound experience.
• A Headphone Amp, also a Preamp The A70 Pro drives headphones well, and it can also be used as a preamp. It has the same high performance as the headphone amp mode, with an RCA output impedance of only 50 and an XLR output impedance of only 100 , allowing it to be used with a wide range of input impedance for various power amplifiers. In addition, a full-featured remote control makes operation even easier.
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Features

• The counterattack of discrete amplifier TOPPING LA90 Discrete,an unprecedented performance benchmark will bring you a breathtaking listening experience. The newly developed discrete NFCA power amplifier reaches a new level of pristine sound and accuracy. The unprecedented level of performance will bring you absolute amazement on the sound quality.You will experience the darkest background you ever experienced with jaw dropping clarity.
• Rock solid The LA90 Discrete's housing is a high-precision CNC machined all-aluminum enclosure that provides exquisite detail and rugged protection. Passive cooling on both sides provides reliable and fast heat dissipation for the LA90 Discrete amplifier circuitry.
• Low distortion The LA90 Discrete's THD+N is <0.0001%@4 /5W, <0.0001@8 /5W. This is already as low as an excellent DAC. It means a more accurate reproduction of the music source. The LA90 Discrete has a very wide working range with low distortion under load. Even in the commonly used 4 load 1W-60W output and 8 load 1W-40W output, the LA90 Discrete can control the distortion around 0.0001%.
• BTL mode - More power than you need High current discrete output circuit gives higher bridging power. With 4 ohms bridged, up to 180W of power is enough to make the sound more complete and fuller.
• Mono mode and Stereo mode The LA90 Discrete can be configured in the common stereo two-channel mode or in high-power mono mode, with a minimum load of 4 when using the mono mode.
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Features

• Dual AK4499EX & AK4191 DAC Chips The GUSTARD A26 DAC combines two AK4499EX DAC chips with one AK4191 modulator from Asahi Kasei Microdevices. With independent power supply and grounding for each channel, separate digital-analog architecture eliminates interferences from the beginning. Note: Currently, the A26 firmware upgrade only supports Windows. Please contact the seller for details.
• FPGA Exclusive Technology & Streamer / Renderer Adopting FPGA exclusive technology, the A26 features signal routing, clock management, 2rd order PLL, DOP decoding, and Depop for PCM & DSD. Besides, utilizing Streamer/Renderer, an easy access to high-quality online streams, the GUSTARD A26 can supports Roon /UPnP /HQ Player NAA at present, and there will be more protocols in the future.
• Clock Synthetization & XMOS XU216 Solution Equipped with K2, ultra-low noise clock synthesizer, the A26 DAC features a precision clock from local oscillators or external clock in. It is worth mentioning that the GUSTARD A26 can replace the input signal' s clock with precision oscillators (local or external) and avoid the interference from the input source' s clock. In addition, the A26 DAC applies XU216 from XMOS, supporting up to PCM768 (with MQA-support) and DSD512.
• LPF Discrete Circuits Design LPF is specifically designed for the AK4499EX using discrete devices, whose final parameters of the circuit are adjusted with subjective listening. Different from ICs, these discrete circuits provide the possibilities to control every detail in sound and performance. However, these parasitic effects would introduce huge challenges to development experience and device's quality.
• Full-Functional Remote Control Except for its excellent configuration, GUSTARD A26 characterizes a sandblasted aluminum alloy case with an OLED display and a touch panel. And users can easily enjoy their music rich in details by using the standard remote control.
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Features

• Fully discrete NFCA also create wonderful amp TOPPING A90D uses fully discrete components to redesign the NFCA (Nested Feedback Composite Amplifier)module. 4 built-in NFCA-Discrete modules which each them uses 39 transistors build up fully balanced structure. The optimized Voltage Current hybrid feedback architecture along with UHGF (Ultra High Gain Feedback) technology provide excellent DC and AC performance.
• High output voltage, high current, low output impedance, no headphones that can't be dealt with High output voltage can easily drive high impedance headphones; High output current allows low-sensitivity headphones to obtain enough power; The low output impedance will not bring unnecessary effect on FR when driving low-impedance headphones. Different headphones can be easily driven by the A90 Discrete.
• 2 Gain settings TOPPING A90 Discrete has two gain options, which are enough to cover a wide variety of headphones: low gain to drive the IEMs with high sensitivity, and high gain to drive full-sized over-ears. Combined with the 0.2uVrms ultra-low noise, even sensitive lEMs will not suffer from any noise.
• Ground Loop Noise Terminator Ground loop noise may be encountered when multiple devices are used in combination. A90 Discrete adds a GND/LIFT switch to solve this problem. When in normal use, set it to GND; and when ground loop noise is encountered, switch it to LIFT. Then the ground loop noise is eliminated.
• A Headphone Amp, also a Preamp When it is in preamp mode, you can get the same high performance as the headphone amp mode, and the 20ohm SE and 40ohm balanced output impedance are widely suitable for various power amplifiers. A90 Discrete can not only switch between the headphone amp (only output from the headphone jack) and the preamp(only output from RCA and XLR), but also support the output from all at the same time.
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Features

• 8-core driver for unmatched detail The D70 Pro OCTO is equipped with 8 Cirrus Logic flagship chips CS43198. The D70 Pro OCTO also supports up to PCM768kHz/32bit and DSD512 audio decoding, which letting you experience audio with unparalleled detail and fidelity. Even the subtlest nuances come alive, creating a listening experience that's true to the original recording.
• Aurora UI bring new experience The full-color screen and three touch buttons of the D70 Pro OCTO introduce a refreshing UI experience. Whether you're toggling playback information, FFT, or VU, the vibrant colors pull you in, creating a customizable visual delight.
• Plug and play Compatibility is king, and the D70 Pro OCTO knows it. Use it immediately on Windows 10, Windows 11, MAC, Linux, iOS/Android, and more. And for Windows users who need ASIO applications, the stable and reliable XMOS XU316 and Thesycon custom driver make setup a breeze.
• Freely switch output modes Whether you need RCA single-ended output, XLR balanced output, or both, the D70 Pro OCTO has you covered. Freely switch between output modes to adapt to different devices and performance needs. It's all about giving you more possibilities and convenience.
• Integrated preamp with independent volume memory In addition to its DAC prowess, the D70 Pro OCTO also serves as an integrated preamp. Adjust volume and output directly to power amplifiers or active speakers. With independent volume memory for different modes, you'll always return to your last-used volume setting.
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Features

• Ultra-high Performance NFCA modules A50 III uses the same NFCA module from A50s. Voltage Current hybrid feedback architecture along with UHGF technology provides excellent DCand AC performance. High output current drive capability allows the amp driving low impedance headphones with ease.
• Full aluminum case A50 III has a unique integrated design. It has gone through dozens of processes of planning, design and precision machining from solid aluminum bricks. CNC machining provides excellent electromagnetic shielding while giving the A50 III a smooth appearance and superior strength. It is not only the masterpiece of craftsmanship, but also the perfect combination of art and technology.
• Single-end / Balanced application The A50 III has 6.35mm single-ended and 4.4mm balanced headphone jack, as well as RCA single-ended and TRS balanced input. It is simple and efficient for you to choose different input and output combinations.
• Wide range of adaptation to headphones The A50 III has three gain selections for all types of headphones. With low noise of 0.3uVrms, IEMs will not be disturbed by any noise floor.
• Powerful Output With a powerful output of 3500mW x 2, the A50 III ensures that most headphones can maximize their performance. It maintains a low distortion rate of less than 0.1% even at high power.
• 12V Trigger The A50 III is equipped with 12V Trigger input, which supports switching on and off synchronously with other devices.
• Perfect partner D50 III The D50 III and A50 III have the same design language. This combination has unique metallic aesthetics no matter how it's placed. And they meet the needs of most headphones and active speakers. The A50 III can also be switched on and off with the D50 III via 12V Trigger.
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Features

• Supports high-resolution audio TOPPING E30 II uses two sub-flagship AK4493S chips of AKM's VELVET Sound technology. AK4493S is an upgraded version of the previous AK4493. Two AK4493S in parallel can achieve better performance and reduction ability than a single chip.
• Improved NFCA TOPPING L30 II uses redesigned NFCA (Nested Feedback Composite Amplifier) module. It provides 2x output power at 300 load compared to L30. The new circuit has 0.3uV ultra low noise and 144dB dynamic range as well as 0.00006% THD+N.
• Best combo for active speakers We also recommend that L30II and E30II be used with active speakers. Connect the two outputs of L30ll to headphones and active speakers. By switching the outputs of L30II, you can enjoy music on headphones and active speakers respectively
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Features

• High Performance This volume controller uses a step potentiometer (50K), and inside is a PCB integration board, which allows for fine adjustment. High fidelity wired transmission, no power supply required. Recommended for those who want intuitive and simple volume control without concern for sound quality!
• 3.5mm Input and Ouput You can connect players with 3.5mm output or RCA output. For example: Cell phone, computer, MP3, DVD, Nintendo Switch can be connected to a PC display. You can connect to amplifiers or active speakers with 3.5mm jack or RCA jack input. For example: power amps, DACs, headphones, active speakers.
• Strong Construction Build in aluminium CNC chassis, made of metal shell and ALPS rotating shaft looks nice and durable. High quality shock-absorbing pad is used on the bottom of the volume controller to prevent slipping.
• Plug and Play No need to install any driver or software on your PC to drive this volume controller, it will work once you plugging on the device; The volume adjuster directly adjusts your Windows volume which won't cause distortion and noise.; If you use it with an OTG cable, it can also be used with mobile phones.
• Wide Applications The best volume controller for watching videos, playing games, and even various events, weddings, celebrations, conferences, shows, etc.
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Features

• BOX01 phono preamp is designed for home MM(moving magnet) turntable record players to convert phono signals to line level signals. It is only a preamp, which needs to be used with amplifiers or active speakers.Its design includes a grounding post that effectively protects your turntable, ensuring optimal performance.
• Low-Noise Dual Operational Amplifier - The BOX01 turntable preamplifier adopts the NJM2068M chip, which provides a high performance on low noise signal processing.With an SNR of 67dB and THD of 0.008% @ 1kHz and 208Vrms Output level, along with a standard RIAA frequency response.It provides a real sound with low noise when you enjoy the music from your vinyl records.
• Simple Plug & Play: This mini preamp has stereo RCA inputs and stereo RCA outputs. Connect the turntable to the RCA inputs and ground. Then, connect the amplifier receiver to the RCA outputs. It also comes with a 12DC adaptor
• For vinyl record enthusiasts who want to integrate their collection into their home stereo system, this phonograph amplifier is the perfect solution. Its built-in low-noise phono preamp circuitry ensures accurate sound replication, conforming precisely to the RIAA standard. Encased in a durable black anodized steel case, pure copper GND and gold-plated RCA terminals,it provides a reliable and rugged solution for flawless audio transmission.
• What You Get: BOX01 phono preamp x1, 12V power adapter x1, User manual x1, our worry-free 24-month warranty, as well as friendly customer service.
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Features

• Fully balanced structure,Pure sound quality The PA5 II and PA5 II Plus adopt a fully balanced structure and an innovative Class D amplifier circuit to achieve high power and low distortion sound output. The excellent tuning technology of engineers ensures clear, clean, deep sound, and no audible noise floor. The fully balanced structure makes PA5 II/PA5 II Plus no more hum, no more noise, no more ground loop.
• THD+N as low as an excellent DAC The distortion of PA5 II and PA5 II Plus is already as good as the DAC. When outputting 5W under a 4 Q load, THD+N<0.0004%; When outputting 5W under an 8 Q load, THD+N <0.0003%. The extremely low distortion level takes your music experience to the next level.
• Comprehensive circuit protection It has no noise when turned on or off, and has complete protection for overvoltage, undervoltage, short circuit, overcurrent, and overheating. Even if there is an unexpected power outage, it will not generate noise, making you worry free to use.
• High output power The PA5 II Plus is capable of delivering up to 140W x 2 for 4-ohm loads at 10% distortion, and 125W X 2 for 4-ohm loads even when the standard is raised to 1% distortion. Similarly, the PA5 II can output 100W x 2 for a 4-ohm load at 1% distortion. High output power and low distortion characteristics make PA5 II series amplifiers sufficient to meet the needs of most speakers and use occasions.
• Special partner- D10 Balanced D10 Balanced can provide high fidelity USB decoding function and TRS balanced output. When used with PA5 II series amplifiers, it is equivalent to adding a high-performance USB input jack to the PA5 II series amplifiers. This combination is both concise and efficient when only USB input and amplifier output are required.
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Features

• Ultra-High Performance NFCA modules L70 uses the same NFCA (Nested Feedback Composite Amplifier) module with A90. Voltage current hybrid feedback architecture along with UHGF (UItra High Gain Feedback) technology provide excellent DC and AC performance, ultra-low THD+N and absurdly high dynamic range of 146dB.
• Fully balanced The L70 is compatible with common headphone jacks including: 4-pin XLR balanced, 4.4mm balanced, 6.35mm single-ended, and 3.5mm single-ended. The built-in fully balanced amplifier circuit can not only fit well with balanced headphones, but also have perfect performance with single-ended headphones.
• Compatible with almost all kinds of headphones TOPPING designed the L70 to be able to power the vast majority of headphones. With high output voltage, it easily drives high impedance headphones. With high output current, it easily drives low impedance headphones. And with low output noise, it easily powers highly sensitive IEMs without creating background hiss.
• A Headphone Amp, also a Preamp The L70 is not only able to drive the headphones but also served as a preamp. When it is in preamp mode, you can get the same high performance as the headphone amp mode, and the 20ohm SE and 40ohm balanced output impedance are widely suitable for various power amplifiers. The full-featured remote control makes it more convenient for you to use.
• E70 will be the best dac for L70 L70 and E70 have fully matched design languages and styles, L70 is suitable for almost all kinds of headphones. The E70 and L70 can be switched on and off through the 12V Trigger interface, so that the L70 can be synchronized with the automatic or manual on/off of the E70.
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