very low volume on JAMO SUB 650

Hello,

For those who could have the same issue here is what I found.

After several tests I found a chemical capacitor was shorted to the ground. This capacitor is connected to a gate of a MOSFET and the OFF/ON/AUTO circuitry itself connected to the sense of the audio signal. The sub detect an audio signal and change the state of the ON/OFF signal to amplify the audio signal.

With the capacitor shorted to the ground, the amplification stage was never used.

I changed the capacitor and now it works.