So, I just installed a sub in my S. Got it all wired up and turned on etc, and turned the bass up on the head unit. When I go around to the trunk to look at the amp settings, the sub sounds like a regular door speaker... Not much bass, but some... but I can hear regular sounds through it too This is not right...

I couldn't find a troubleshooting guide anywhere to address this issue...

Sub: Rockford P3SD210
Amp: Boss CW150

I know the amp is underpowered, but I don't want rap bass that rattles my trunk, I just want a little bit of thump

 

try to find the low pass filter on your amp

 

I can only find one knob on the amp...

Input knob and it just makes it louder and quieter

 

which HU do you have? try to check if your hu has built in cross over...

 

alpine cda-105 =)

 

Does the manual say anything about a LPF? I found a couple sites that say that amp has one, but the pictures don't show anything. Is there such a thing as a LPF that is always on?

That HU has a crossover built in. You might also need to turn the sub output up to get much of anything.

 

Yeah... I think the amp is a piece of ... ****

One of my friends has one he is going to let me borrow for a day to test and see if that is the issue. He is gonna try to bring it over tonight.

 

pretty sure that the CDA-105 doesn't have LPF built-in, PXA-H100 is required for crossover functionality.

I just downloaded the manual for that amp and it doens't have any kind of crossover at all...

probably the most feature rich amplifier for under $1000.... lol

 

Lol, yeah, my friend brought his amp over to test and see if thats my problem...

We blew it ... LOL

He didn't have a fuse, and he said it takes a 30... white smoke... hissing noises... hahaha /fail

Put the crappy 200w back in and it works like it did before... now I have to find a way to have a LPF... ugh

 

You're right. I missed that the crossover was only available with the add-on.