there is no way to swith the amps on a mach system that I know of.

I do not know where the fuses are and would need to look in the manual to find out, the same as you do. Anytime i suspece a bad fuse though I check EVERY fuse(under the dash and under the hood) as circuits are often looped through different circuits that you would not suspect.

Does the rear subs work? Any bass at all?

 

zero bass what so ever. i have checked all the fuses under the dash, i didnt think to check the ones under the hood

 

What about the rear subs? Is there any bass?

 

there is zero bass

 

I have the same trouble with mine,=no bass at all.Ibought 2 used amps and nothing changed at all, same thing.no bass. any more ideas guys?