The HM4S is made with reference to the circuit of the German Burmester 933 MK2 Memorial Edition balanced input pure post-stage power amplifier.
Burmester's equipment is famous for its exquisite sound, powerful dynamics and strong sense of scene.
The whole series of pure power amplifiers have extremely low output impedance and extremely high damping coefficient. Even the 933 with an output power of only 120W/4 Ω also has low frequency control power. It can cope with some speakers that are difficult to control. When it is matched with the Dynaudio series speakers, it has a very outstanding performance, and has an invincible noble voice.
Commissioning instructions:
Adjust the adjustable resistance to make the power resistance 0.47R have a voltage of 47mV at two points. Different current has different listening sense. Players can taste it carefully (ZERO-ZONE recommends 200MA)
Works voltage: DC +/- 30V to +/-50V
Gain: 24 times
Output power: 50W+50W (8ohm load at +/-30VDC), 150W+150W (8ohm load at +/-50VD)
