M10 is designed to meet the requirements of HIFI high-fidelity audio listening effects with large dynamic range, high power, and low distortion. Thanks to the adoption of BTL bridge technology, it can easily achieve 400W of power under AC33X2 power supply, equivalent to the power of an OLC amplifier with 60V power supply. BTL also effectively reduces even-order harmonic distortion in the circuit, which is beneficial for audio perception.
The circuit is referenced from the American Qili 100 input architecture, featuring fully balanced dual differential input, stability, wide bandwidth, and excellent soundstage. The independent structure of left and right channels enhances heat dissipation and separation. Each channel is equipped with 4 pairs of original Japanese 2SC5200/2SA1943 drivers.
Other materials used are also of high quality, including German WIMA coupling, gold-plated NOVER capacitor with 8000OUF filtering capacity, and precision 1% metal film resistors, among others.
Due to its high power, the circuit is equipped with power-on/off delay protection, output short-circuit protection, DC output protection, etc.
PCB size: 228X96MM
Finished board plus heat dissipation weight: 1.39kg
Power supply voltage: AC18X2 to AC36X2, 2-channel independent power supply
Output power: 400W x 2 (8 ohms), 500W x 2 (4 ohms)
Frequency band: 10HZ-30HZ
Distortion: 0.002%
Debugging: Debugging is quite simple. Simply measure the voltage between the two ends of the TEST point to ensure it is 20MV. The above is a test of quiescent current. Then adjust the corresponding adjustable resistor to make the output terminal close to 0MV.
