Topping A30 Pro

▶ APX555B Limited Our Measurement Again: The THD + N of A30 Pro is no higher than 0.00006%, which means the A30 Pro accurately restores 99.99994% of the original sound, what you get is what you input.
▶ Pushing The Envelope: A30 Pro uses the new specifically redesigned NFCA based circuit is optimized for terrific single ended performance. Massive paralleled high performance audio opamp architecture along with UHGF technology provides excellent DC and AC performance.
▶ 4-PIN-XLR + 4.4mm +6.35mm Output: Since then, buying headphones does not have to consider whether the plug matches the headphone amplifier, because the A30 Pro already provides you all in a compact body, including 4-PIN-XLR, 4.4mm, 6.35mm.
▶ ≥250Ω = Cass A: A30 Pro is designed with ample quiescent current. When the headphone impedance is greater than 250 ohms, itwill fully work in Class A operation.
▶ SE + BAL Input Pass Through: When shutting down, the input signal is directly output to RCA or TRS without amplification, which will be more suitable for active speakers / monitor speakers when the DAC has pre-amplifier functions. Even better when used with D30 Pro, the excellent noise performance of D30 Pro is not wasted.