TOPPING A90 Discrete Fully Discrete Balanced Headphone Amp & Preamp | Key Highlights Built with four fully discrete NFCA modules composed of 39 matched transistors each, it delivers 9800mW×2 power at 16Ω, ultra-low THD+N below 0.00005% and 145dB dynamic range, with output impedance under 0.1Ω to effortlessly drive IEMs, dynamic and planar headphones. Two gain modes suit all headphone types, paired with 0.2uVrms ultra-quiet background noise. Precision R2R relay volume control supports independent volume memory for inputs/outputs and custom startup volume. It serves dual roles: headphone amp and balanced preamp to directly power active speakers. The GND/LIFT switch eliminates ground loop hum in multi-device setups. Equipped with 4-Pin XLR, 4.4mm balanced and 6.35mm SE headphone jacks, plus XLR/RCA I/O expandable via EXT90 for extra inputs. 12V trigger IN/OUT enables synchronized power control with matching DACs. Full-function remote, CNC aluminum chassis in black & silver, perfectly stacked with D90 III SABRE to build flagship full-balanced desktop HiFi systems.

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