Subwoofers in car not working right?

Question

i have 2 subwoofers in my car and have had them for a year now. they worked great until now. one day they completely went out so i took them back to Best Buy (where i had them installed) and they fixed the problem. now i have a new problem just a few days later...the subs are coming in and out. what i mean is that they will be performing at what they should be and then all of a sudden in the middle of a song, they will lose about 75% of the bass. this happens to every song and they go in and out constantly.

please post what could be wrong and a way to fix it. i have a Rockford Fosgate amp and 2 MTX Audio subs. idk their specs but i do know that the amp can handle the subs. i dont want to take my car back just yet because it takes them a couple of hours and i have a job and dont have the time during my day.

thanks

Answer 1

First need to know the model # of the subs and amp to make sure it's not a compatability problem.  Then you will need to check to make sure the wiring is correct as there are a few things that will cause that problem.

Best Buy and commercial places like that aren't always perfect in installs so post those and we can take it from there...

Answer 2

it sounds like they may have wired the subs up incorrectly (wrong impedance at the amp), but it could be anything-- you need to tell use the model number of your amp and subs for a better answer