Buy the TOPPING A90 Discrete (A90D) Headphone Amp on Apos Audio

The Next Chapter for a Beloved Favorite

We’re ecstatic to announce the arrival of the TOPPING A90D Headphone Amplifier on Apos Audio. It’s an upgraded version of the groundbreaking A90 headphone amplifier. As its name suggests, the A90D (the D is for Discrete) uses fully discrete components in a complete redesign of the A90 NFCA module.

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, check out this comparison chart.

Product highlights

  • Headamp/pre-amp
  • NFCA discrete modules
  • 9800mW x2 output power
  • Outputs: 4-pin XLR, 4.4 balanced, 6.35mm SE
  • R2R relay volume control
  • Ground loop noise terminator
  • 12V trigger interface
  • 2 gain settings
  • <0.000055% THD+N
  • 145dB DNR

Head on over to the TOPPING A90D product page, and if you need more information please contact our dedicated Support Team via live chat online or email us at

As with all purchases, when you buy from us you get the Apos Promise for Free Priority Shipping, an Extended 2-Year Warranty, a 45-Day Return Policy, and our 30-Day Lowest Price Match.