The A90 Discrete, or A90D, is an upgraded version of the groundbreaking A90. As its name suggests, the A90D uses fully discrete components in a complete redesign of the A90 NFCA module. Four discrete NFCA modules using 39 transistors each form the fully balanced amp architecture. The matched precision transistors ensure unparalleled distortion and noise performance. A90 Discrete vs A90 Besides featuring fully discrete NFCA modules, the A90D features a number of quality-of-life improvements that are lacking in the A90. These include an R2R volume relay, a remote control, a ground loop noise terminator switch, a 12V trigger interface, a redesigned UI, volume memorization, and more. The specs of the A90D are also slightly better. For a complete breakdown of the differences between these models,

Used for 2 years with no issues. Including all accessories like the remote. Introducing the TOPPING A90 Discrete (A90D) Fully Balanced Headphone Amplifier, a high-quality device designed for audiophiles who want to enhance their music listening experience. This amplifier offers a fully balanced input and output stage, which ensures that the sound quality is optimized for any music lover. With its compact design, this headphone amplifier is perfect for those who want to save space in their home. It's easy to use and comes with a range of features that enhance the overall listening experience. The TOPPING A90 Discrete (A90D) Fully Balanced Headphone Amplifier is a must-have for anyone who wants to enjoy their music in the best possible way.

Great headphone amp. Like new. Check out my other listings.

Up for bid is 2 brand new Sparkos labs inc dual op amps.

Very lightly used Topping A90 Discre Headphone Amplifier (less than 100 hours) like new condition. This is an extremely powerful and neutral amp, it sounds amazing.

Lightly used.The product shown in the photo will be shipped as is.It works properly.Please check the cosmetic condition in the photos. ?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 cant 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.

2nd owner. Still in excellent condition

Condition is used in perfect condition w/original box, cables, and remote. No issues, operates as new. About this item ?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 cant 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.

Lightly used.The product shown in the photo will be shipped as is.It works properly.Please check the cosmetic condition in the photos. ?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 cant 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.

Condition is used in perfect condition w/original box, cables, and remote. No issues, operates as new. About this item ?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 cant 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.

Condition is used in perfect condition w/original box, cables, and remote. No issues, operates as new. About this item ?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 cant 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.

Lightly used.The product shown in the photo will be shipped as is.It works properly.Please check the cosmetic condition in the photos. ?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 cant 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.

Topping A90D Discrete headphone amplifier in excellent condition and completely tested. Includes the RC-16 remote, power cable, and upgraded 6.35mm adapter. 1 year warranty with Aoshida U.S. registered the day of the listing. Firmware is the latest 2.8 and just sounds amazing with complete transparency. We ship the same day on orders before 2pm EST Mon-Fri and 10am Saturday.Please send a note with any questions for a prompt reply.We ship to all countries supported by the eBay international shipping program. Your order will be packed and boxed very carefully. Visit our store, we specialize in audio equipment, and constantly have new items arriving.

Topping A90D Discrete headphone amplifier works perfect with 1 year Hificollege warranty just registered. Includes the RC-16 remote (the jog wheel on the front also has all the functions and settings). Very tiny nick on the front (see zoomed in photo) as they didnt bag the 6.35mm adapter properly. Just flashed the current 2.8 firmware so its up to date. We ship to all countries supported by the eBay international shipping program. Will ship the same day if ordered before 2pm EST weekdays and 10am Saturday. Please send a note with any questions for a prompt reply. Visit our store, we specialize in audio equipment, and constantly have new items arriving.

Lightly used.The product shown in the photo will be shipped as is.It works properly.Please check the cosmetic condition in the photos. ?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 cant 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.

Used working Topping A90 Discrete balanced headphone amplifier and preamp. If anything is not working, please let me know, and you can return it at my expense, for a full refund. Only what is pictured is included. If it is not pictured it is not included. This listing includes: 1 x Topping A90 Discrete Balanced Headphone Amplifier and Preamp1 x Remote1 x Power Cable

This is a gently used Topping A90D balanced amplifier. I used this for about 2 months before upgrading to a more expensive amplifier. Honestly, not much difference in the end. Comes with original box, cords, remote, and instructions.

Lightly used.The product shown in the photo will be shipped as is.It works properly.Please check the cosmetic condition in the photos. ?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 cant 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.

Upgrade your headphone experience with the Topping A90 discrete audio amplifier. This amplifier features stereo RCA and XLR in/outputs and 4.4mm and 4-pin xlr balance connection with remote control to bring your sound to life with a warm discrete soundstage. With a sleek silver metallic design construction, the Topping A90d is perfect for any headphone audio setup. Enjoy high-quality completely dark background audio with a powerful 9-watt output per channel you can run ANY headphones no matter how power hungry they are. The Topping A90d delivers exceptional wide and warm sound quality perfect for amplifying even your desktop 6-inch monitor speakers, this amplifier is a must-have for any audiophile. Comes withOriginal boxAmplifier unitPower cableRemote control

In mint condition. Has all original contents and packaging.

Lightly used.The product shown in the photo will be shipped as is.It works properly.Please check the cosmetic condition in the photos. ?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 cant 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.

Lightly used.The product shown in the photo will be shipped as is.It works properly.Please check the cosmetic condition in the photos. ?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 cant 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.

Item TitleTopping A90 Discrete Headphone Amplifier DescriptionThank you for your interest.The simple operation has been verified.There are scratches but no functional problems.All accessories are shown in the photo.Please note that we may not be able to answer technical questions. Payment Supports managed payments Please pay within 5 days after auction is finished. About Us We are located in Japan. Its our pleasure to make you happy by proposing our recommend item. If you have any questions or request about items please feel free to ask us. International Buyers - Please Note: -Import duties taxes and charges are not included in the item price or shipping charges. These charges are the buyers responsibility. -Please check with your countrys customs office to determine what these additional costs will be prior to bidding/buying. -These charges are normally collected by the delivering freight (shipping) company or when you pick the item up - do not confuse them for additional shipping charges. -We do not mark merchandise values below value or mark items as - gifts - The US and International government regulations prohibit such behavior. Thank you for your understanding.

Introducing the Topping A90D Discrete Balanced Headphone Amplifier, a high-quality audio device designed for music enthusiasts who value excellent sound quality. This amplifier features a sleek black design, with two audio inputs and outputs, and a number of channels and inputs of 2. The audio inputs include stereo L/R RCA and XLR, while the audio outputs include RCA, headphone jack, and XLR. The Topping A90D is a reliable and durable headphone amplifier that provides a powerful and clear audio experience. It is perfect for those who want to enhance their music listening experience without compromising on style and functionality. Get your hands on this amazing audio device today and enjoy high-quality sound quality like never before!