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AmplifiersHeadphone AmplifiersPre-Amplifiers
Estimated price (community-sourced)
$425 - $599
Around — community and catalog average, updates slowly
About the A90 Discrete
The Topping A90 Discrete (A90D) is a high-performance headphone amplifier and pre-amplifier featuring fully discrete NFCA (Nested Feedback Composite Amplifier) modules. Each of its four amplification modules contains 39 transistors in a fully balanced architecture, delivering 9800mW x2 power output at 16Ω. It supports multiple output types including 4-pin XLR, 4.4mm balanced, and 6.35mm SE, with R2R relay volume control and ground loop noise termination.
Specifications
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