Excellent sound from speakers, very quiet sub
I have a 5 channel (4+1) amp that I have connected to my 4 factory speakers as well as a factory 8" subwoofer. I did not connect the sub until after having the whole system installed and prior to having it hooked up I had excellent (loud and crisp) sound coming from the stock speakers.
The amp is an Ultimate T2-5450 with a 4-channel input (2-channel selectable) and a 4-channel + sub output. The 4-channel output has a selectable and adjustable HP filter while the sub output has a adjustable LP filter with bass boost.
As I said, the 4 speakers performed excellent while the sub performance was terrible. I could barely hear any sound coming from the sub but I do know that it was working correctly as the filter adjustment would change the frequency range being outputted. I tried with bass-boost on and off but it didn't seem to alter the sound at all. This may have been because the output was very low anyway.
I did not have a very suitable connection to the terminals of the sub; i pretty much just wrapped the wire around rather than attaching the correct terminal spade connectors and it wasn't completely secured in it's box; it only had a couple screws holding it in. I am hoping that these are the reasons I wasn't getting very good performance from the sub. Could this be it?
The reason I only tested it as described was because I was running out of time getting the system running and ended up removing the car PC and disconnecting the fuse to the amp and re installing the factory cd player as the car PC needs more work.