SNR: > 120dB
THD+N: 0.0005 %
Crosstalk > 100dB
Frequency response:20 -20 KHz-0.3 dB
Balance output power:600 ohm â‚¤ Âº400mW 300 ohm â‚¤ Âº700mW 150 ohm â‚¤ Âº1.3 W
32 ohm â‚¤ Âº2.5 W unbalance output power: 600ohm â‚¤ Âº120mW 300 ohm â‚¤ Âº200mW 150 ohm â‚¤ Âº350mW 32 ohm â‚¤ Âº800mW Power Consumption:
A28 is a fully balanced class A headphone amplifier constructed by 4 amplification channels. Its complete connections are convenient to connect source and headphones with different terminals.
Plitron power transformer from Canada, Neutrik XLR connectors, and Alpha 4-gang potentiometer made in Tai Wan. Unbalanced inputs are converted to balanced signal by an OPA1632, and the balanced/unbalanced input selection is done by a group of relays to optimize signal
The amplification is OPAMP driven complementary transistor buffer (also known as Â¡Â°Diamond BufferÂ¡Â±).
Please be noted, if you use a same source to feed A28, do not connect the RCA and XLR interconnects altogether. This will cause common ground interference and degrades the performance of the RCA input signals. (This applies not only to A28 but other similar products in our tests).