Topping A90 Discrete Balanced Headphone Amplifier & Pre-Amplifier - Open BoxThe Topping A90 Discrete Balanced Headphone Amplifier (A90D) is a direct upgrade over it's predecessor, the Topping A90. Featuring a number of quality of life improvements including a R2R volume relay, a remote control, a ground loop noise terminator switch, a 12V trigger interface, a redesigned UI, volume memorization, and more, the A90D is better in every way. As its name suggests, the A90D uses fully discrete components in a complete redesign of
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