Excellent instrumentation amp in terms of ASR specifications. Works great with the headphones I plug in, MSR7, HD 560s, Sundaras, x2HR. In terms of performance, this amplifier can do justice to many headphones. If it only had balanced inputs it would be worth the money. (Luckily, Topping have come out with another great amp in the form of the a30pro). My devices are connected to my computer via USB with topping e30, RCA with my topping a50s. With 2 of my balanced headphones.
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