Product Details:
Works voltage: AC115V or AC230V
Suitable for 32-600ohm headset
Input impedance 50 kΩ
Frequency response 1Hz ~ 100kHz (-3dB)
THD (total harmonic distortion) 0,002% at 170 mW / 250 Ω
Channel separation> 82 dB
SNR 92 dB
Weight about 2kg
Size:220*52*191mm (W*H*D)
This amp is base on Beyerdynamic A1. each channle using 2 pair Original BD139 140 in parallel, Strong thrust. With 30MV protection current,delay 7 seconds output audio. we have test this amp with Beyerdynamic DT series headphones, AKG K501, K601, K701, Sennheiser Headphones HD Series, all has very good performance.
Main Materials:
1/4W 1% precision metal film resistors (made in TAIWAN)
BC high-end filter capacitances,South Korea SAMWHA Aureate electrolysis,
AUDIOPHILE MKP 4U7 400V 3% precision tinfoil capacitance
Origilal ST MC33078N opamp
Philips BD139、BD140 transistors(The same batch number)
Omron G2R - 2 12V Relay 700MV Protection circuit,7 seconds delay connect function.
Origianl ALPS 27 type potentiometer.
30W high quality quality Toroid Transformer.
High quality grinding RCA
Full Aluminum chassis
Package List:
1 × HD-8-A1-PRO Headphone Amplifier