I bought my first USB DAC new in 2021. Iveadded some accessories to it, like a silver vertical metal stand and awell-liked Sparkos Discrete Op Amp SS3602, which is worth $75. Ive kept it ingood shape, and it comes in its original box. You can pick them up from the warehouse where I work, not from a home.

Selling my a90d headphone Amp. Ive kept this in excellent condition, and will be including everything in its original packaging. Feel free to ask any questions. Thanks for looking!

Elevate your audio experience with the Topping A90D Headphone Amplifier. This device boasts top-of-the-line features including a discrete balanced design and compatibility with a wide range of audio devices. The A90D is the perfect choice for audiophiles who demand the highest standard of audio quality.

Elevate your audio experience with the Topping A90D Black Headphone Amplifier. Designed with a discrete balanced technology, this amplifier delivers exceptional sound quality without compromising on performance. With stereo L/R RCA and XLR audio inputs, and RCA and XLR audio outputs, this amplifier is versatile and can be used with a variety of devices.The sleek black design of the Topping A90D Headphone Amplifier adds a touch of sophistication to any home audio setup. Perfect for amplifying your favorite music or enhancing your gaming audio, this amplifier is a must-have for any audio enthusiast.

Amp is in perfect working condition. There are minor cosmetix blemishes. Comes with power cable and remote.

Topping A90 Discrete NFCA Headphone Amplifier Preamplifier 6.35mm/4.4mm Balanced/4-Pin-XLR Headphone Output R2R Relay Volume Control (Silver)Brand New SealedHigh Feedback Seller - Buy With ConfidenceFree Insured ShippingLiquidation Seller - All Sales Final Product descriptionTOPPING A90 Discrete - Fully Discrete Balanced Headphone Amplifier Play VideoProbably the best sound signature of any amplifier Youve heard to date.This is the perfect amp for anyone wanting to get a completely dead-neutral reference sort of amplification.For 600, you cant go wrong.HiFi College is an authorized retailer of TOPPING.Front Panel and Rear Panel Attribute Power input: 100-240VAC 50Hz/60HzSignal input: 1 x XLR (L+R), 1 x RCA (L+R), 1 x EXTHeadphone Amplifier output: 1 x 6.35mm headphone output jack, 1 x 4-PIN-XLR headphone output jack, 1 x 4.4mm headphone output jackLine Out output: 1 x XLR (L+R), 1 x RCA (L+R)Contents list 1. A90 Discrete 2. Remote control 3. AC cable 4. 6.35mm to 3.5mm adaptor 5. User manual 6. Quality card(One-Year Transferable repair and Free Return Policy.)Fully discrete NFCA Upgraded version of the A90.The matched precision transistors ensure unparalleled distortion and noise performance.A90 Discrete vs A90 Include R2R volume relay, remote control, aground loop noise terminator switch, 12V trigger interface, redesigned UI, volume memorization, and more.Ground Loop Noise Terminator 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.12V Trigger interface Set it to (trigger out) or (trigger in), and it can be turned on and off synchronously with other devices equipped with a 12V trigger interface.Compatible with headphone jack 4-Pin-XLR, 4.4mm balanced, 6.35mm SEDrive different headphones Output Voltage: 49Vpp @Balanced / 25Vpp@SE Output Current: Peak 5A / Continuous 1.1A Output Impedance: >0.1 ?Low distortion In addition to the high output power, the A90 Discrete can maintain ultra-low distortion output under high power load.2 Gain settings low gain to drive the IEMs with high sensitivity, and high gain to drive full-sized over-ears.Pre-amp mode 20ohm SE and 40ohm balanced output impedance are widely suitable for connecting a power amplifier to drive bookshelf, desktop, or floor speakers.If working with a Ext90 When working with a Ext90, they could provide totally 4 x XLR and 2 x RCA stereo inputs.R2R relay volume control brings the advantages of precise control, longevity, complete channel balanced and remote control. Also can set to memorize the volume.Remote controller All above operation could be done by a remote controllerWhat pairs well TOPPING D90SE/LE DAC The A90 Discrete can be used with the D90SE/D9OLE DAC, which is almost the lowest distortion HPA + DAC combination.TOPPING LA90 Class AB Power Amplifier The A90 Discrete can also be used as the preamp of the LA90, providing more precise volume control, remote control, and additional input.Features & details ?Fully discrete NFCA also create wonderful amp? A90 Discrete 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? The 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

Amp is in perfect working condition. There are minor cosmetix blemishes. Comes with power cable and remote.

Topping A90 Discrete NFCA Headphone Amplifier Preamplifier 6.35mm/4.4mm Balanced/4-Pin-XLR Headphone Output R2R Relay Volume Control (Silver)Brand New SealedHigh Feedback Seller - Buy With ConfidenceFree Insured ShippingLiquidation Seller - All Sales Final Product descriptionTOPPING A90 Discrete - Fully Discrete Balanced Headphone Amplifier Play VideoProbably the best sound signature of any amplifier Youve heard to date.This is the perfect amp for anyone wanting to get a completely dead-neutral reference sort of amplification.For 600, you cant go wrong.HiFi College is an authorized retailer of TOPPING.Front Panel and Rear Panel Attribute Power input: 100-240VAC 50Hz/60HzSignal input: 1 x XLR (L+R), 1 x RCA (L+R), 1 x EXTHeadphone Amplifier output: 1 x 6.35mm headphone output jack, 1 x 4-PIN-XLR headphone output jack, 1 x 4.4mm headphone output jackLine Out output: 1 x XLR (L+R), 1 x RCA (L+R)Contents list 1. A90 Discrete 2. Remote control 3. AC cable 4. 6.35mm to 3.5mm adaptor 5. User manual 6. Quality card(One-Year Transferable repair and Free Return Policy.)Fully discrete NFCA Upgraded version of the A90.The matched precision transistors ensure unparalleled distortion and noise performance.A90 Discrete vs A90 Include R2R volume relay, remote control, aground loop noise terminator switch, 12V trigger interface, redesigned UI, volume memorization, and more.Ground Loop Noise Terminator 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.12V Trigger interface Set it to (trigger out) or (trigger in), and it can be turned on and off synchronously with other devices equipped with a 12V trigger interface.Compatible with headphone jack 4-Pin-XLR, 4.4mm balanced, 6.35mm SEDrive different headphones Output Voltage: 49Vpp @Balanced / 25Vpp@SE Output Current: Peak 5A / Continuous 1.1A Output Impedance: >0.1 ?Low distortion In addition to the high output power, the A90 Discrete can maintain ultra-low distortion output under high power load.2 Gain settings low gain to drive the IEMs with high sensitivity, and high gain to drive full-sized over-ears.Pre-amp mode 20ohm SE and 40ohm balanced output impedance are widely suitable for connecting a power amplifier to drive bookshelf, desktop, or floor speakers.If working with a Ext90 When working with a Ext90, they could provide totally 4 x XLR and 2 x RCA stereo inputs.R2R relay volume control brings the advantages of precise control, longevity, complete channel balanced and remote control. Also can set to memorize the volume.Remote controller All above operation could be done by a remote controllerWhat pairs well TOPPING D90SE/LE DAC The A90 Discrete can be used with the D90SE/D9OLE DAC, which is almost the lowest distortion HPA + DAC combination.TOPPING LA90 Class AB Power Amplifier The A90 Discrete can also be used as the preamp of the LA90, providing more precise volume control, remote control, and additional input.Features & details ?Fully discrete NFCA also create wonderful amp? A90 Discrete 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? The 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

Burson V6 Classic DUAL Discrete Opamps (x2) Pair Two Pairs available.

Flagship headphone amplifier from leading audio equipment manufacturer Topping. The A90D is an extremely powerful, highly technical, and still remarkably musical headphone amplifier! Capable of ultra high power delivery to low or high impedance headphones with one of the lowest levels of distortion available on the market today, this headphone amplifier is truly a reference quality product that is actually enjoyable to use. This A90D is in excellent condition. It includes all of its packaged accessories - 3.5 mm to 6.35 mm headphone adapter, remote control, power cord, instructions. It has been updated to the latest firmware as of Feb 2024. I am the first owner. I loved my first one so much that I bought a second for another room, but it turns out that Im not using it as much as I thought, and I hate to see it sitting there, not getting the usage it deserves. I will be keeping my first one for quite some time to come. If you are looking for a matching DAC, please see my listing for a Topping E70 Velvet, which pairs extremely well with this amp. Same story with that one, bought a second one for a second room, but turns out Im really only utilizing one of them. Please feel free to message with any questions and happy listening!

Very lightly used and works perfectly. Comes with the original box, remote and all the included accessories.

I have been using this Topping A90D for the past year. It was purchased new from Headphones.com and have proof of purchase that can be provided if necessary when you buy it. It has been a superb headphone amplifier for my Audio-Technica ATH-AWAS headphones and 64 Audio u12t IEMs. But I have recently bought a couple of headphones that require an amp with more reserve power and have upgraded to another amp. This amp is in excellent condition, works great, and is ready for a new home. I do not have the original box. What you see in the photo is what you get. Please do not message me asking if it comes with anything else because I will not answer. Free shipping to the lower 48 U.S. States. No international shipping. On Jan-17-24 at 05:23:13 PST, seller added the following information: Important Note: If you have any questions or concerns then please contact me PRIOR TO BIDDING.  It will prevent bid retractions or me having to cancel your bid.  Thank you.On Jan-17-24 at 08:05:34 PST, seller added the following information: Another Important Note: Please note that in general I take a dim view of bid retractions.  If you have a legitimate reason for retracting a bid then you should contact me in advance and let me know.  If you have a good reason then I wont have a problem with it.  But if you dont contact me you run the risk of having all of your bids cancelled and getting blocked from my listings.

Topping A90 Discrete headphone amp for sale. I upgraded to a different headphone amplifier and no longer need this. About less than 25 hours of use and in excellent condition. Originally purchased from Apos Audio. TOPPING A90 Discrete / A90 Headphone Amp – Apos Audio

Burson Audio V6 Discrete Opamp Dual chip (lot of 2). Used, in great condition. ON THE PICTURES THERE ARE 3 PIECES SHOWN, ONE WAS SOLD SEPARATELY, YOU WILL GET ONLY TWO.

Up for sale is my Topping A90D preamp and headphone amp. This is basically new, mint and open box! It comes with the original box with the remote, warranty and all original contents. However, also included are a pair of 12” XLR cables which adds value. The A90D is a greatly improved to its predecessor model A90. It is sure to improve your sound stage with great detail. The A90D is also claimed to be an outstanding headphone amp, read all the great reviews. Free shipping and priced to sell with no returns. If any questions please message me. Thanks for looking!

Topping A90 Discrete (A90D) Balanced Headphone Amplifier & Pre-Amplifier Amplifier is in great condition, like new. Arrives with the pictured amplifier, power cable, and remote control. Ships within 1 business day (or same day) via USPS Priority or equivalent.

Hallo, Ich verkaufe hier einen Topping A90 Discrete Headphone Amplifier. Das Geraet wurde vor knapp einem Monat bei HifiPassion gekauft und ist daher in ienem so gut wie neuwertigen Zustand. Der Verstaerker ist voll funktionsfaehig und wird nur aufgrund der Ueberschreitung der Rueckgabefrist hier angeboten. Das gesamte Zubehoer sowie die OVP sind ebenfalls enthalten. Bei Bedarf kann ich gerne die Rechnung beilegen. Viel Spass beim bieten! Privatverkauf - Daher keine Garantie oder Ruecknahmen

Thank you for visiting our store!DescriptionAll accessories are shown in the photos.ShippingWe will carefully pack and ship from Japan. Free ShippingFedEx or Japan Post International Buyers - Please Note:Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyers responsibility. Please check with your countrys customs office to determine what these additional costs will be prior to bidding or buying.We do not mark the value of goods below the selling price on invoices, or mark goods as “gifts”. These are illegal according to Customs regulations.Please feel free to contact us anytime if you have any question.Thank you for your understanding.

Up for sale - my Darlington labs MM-5 & power adapter. Selling as Ive upgrade phono preamps. This was purchased directly from Darlington here on eBay, you can see the original specs/listing in the link below. https://www.ebay.com/itm/193759333606?hash=item2d1cf4cce6:g:oKwAAOSwE7dhIETO Unit has been lightly used and has passed the break in period.

Hallo, Ich verkaufe hier einen Topping A90 Discrete Headphone Amplifier. Das Geraet wurde vor knapp einem Monat bei HifiPassion gekauft und ist daher in ienem so gut wie neuwertigen Zustand. Der Verstaerker ist voll funktionsfaehig und wird nur aufgrund der Ueberschreitung der Rueckgabefrist hier angeboten. Das gesamte Zubehoer sowie die OVP sind ebenfalls enthalten. Bei Bedarf kann ich gerne die Rechnung beilegen. Viel Spass beim bieten! Privatverkauf - Daher keine Garantie oder Ruecknahmen

Topping A90D discrete headphone amplifier in perfect condition. Warranty just registered for 2 year before listing. We will ship the fastest practical method and do free upgrades often, depending on location. Please send a note with any questions for a prompt reply. You order will be packed and double boxed very carefully. Visit our eBay store, we ship the same day on orders before 12pm EST Mon-Fri and 10am Saturdays. We specialize in audio equipment, and have new items listed several times each week. We offer USPS, UPS and FedEx shipping options available at checkout. All shipping is at eBay negotiated rates with no markup.

Topping A90D Discrete Balanced Headphone Amplifier - Perfect - Fast Shipping. I just got it recently its very lightly used in like new condition. Fully functional sounds great. I really loved using these with some of my inefficient headphones but I have found another option so Im moving on. I hope whoever picks these up next likes it. I loved themEnjoy :) Accidently unlisted If you have a questions feel free to shoot me a message.