Topping A90D, Power Amplifier: Discrete (2022) XLR Pre-Amplifier Full Balanced AMP (A90D)
Our best-selling amplifier
“Mr. Clean.” “The Giant Killer.” “The Best Amp Ever.” These are a few of nicknames the TOPPING A90, our best-selling amplifier, has gained since its release. At its most basic level, it’s a balanced amp and pre-amp with tremendously clean and powerful output. At its broadest level, it’s become the benchmark by which all other solid state amplifiers below $1,000 are judged.
D for Discrete
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.
Fully discrete NFCA also create wonderful amp
As its name, A90 Discrete uses fully discrete components toredesign the NFCA (Nested Feedback Composite Amplifier)module. 4 built-in NFCA-Discrete modules which each themuses 39 transistors build up fully balanced structure.Theoptimized Voltage Current hybrid feedback architecturealong with UHGF (Ultra High Gain Feedback) technologyprovide excellent DC and AC performance. Benefiting fromthe new design, the output capability is stronger than ever,which allows the amp driving low impedance headphoneseven more effortlessly. The paralleled ultra low noiseprecision matched transistors in the design ensured theunparalleled distortion and noise performance.
A90D 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
What’s included:
A90D
A90D Headphone Amplifier
Remote control
AC cable
6.35mm to 3.5mm adapter
User manual
Warranty card
A90
A90 Headphone Amplifier
AC cable
6.35mm to 3.5mm adapter
User manual
Warranty card