[sdiazmun]

Hi!!

Im just received a second hand MP573 (I have other three), and after compare them with "Smaart", the last one has a -6dB drop across the entire frequency spectrum, and that difference remains even when modifying the gain or the output potentiometer.

Where should I start looking for the point of failure?

Thanks in advance
Regards 
Sergio

[JPK]

Is the 6dB drop the same for a gain set to 20dB and a gain set to 30dB ?

[sdiazmun]

Yes, at all gain and output positions

[JPK]

Perform the checks described here, starting by Try to follow the signal:
https://www.soundskulptor.com/forum/index.php?topic=5.msg5#msg5

Report any difference.