I bought myself an used 800W amplifier 2 channel after I have been driving with only 400W for a while.
The 400W was so little that i could fit it in on top of the sub that comes with the car. But the new one is bigger, but I tried to fit inside anyways, it didn't work.
Now my sub is making a brumming noise when the ignition is on, and even more when tha car is on. The element is moving more than ever, and the spundquality is worse. I have a Rockford Fosgate P1 250W rms sub.
I've checked the ground and tje signal cables.
What can be wrong? Thanks for reply