Hi,

my brother/friend just bought a used clarion MCD360 crossover which gave a problem the second we installed it.
It gives out a low/weak volume and when you put the volume and gain louder than normal the sq goes bad. It gives a blurry,rumbeling sound, as if it doesn't get enough power or something.
We're using aux to pre-amp at the moment which is working flawless.

Notes: I already checked the crossover power, power wiring, rca cables.

Thanks in advance