1999 mustang gt mach 460 sound system has sound(treble) coming from all speakers but no bass, why? $ for ans!?

Question

Only treble is coming from all of the speakers. This is normal via the tweeters but the door and back speakers lack bass and only play treble....please help

im not sure if its the amp. i was listening to it 1 day then all of the sudden the bass cut out i pulled the head unit and cd player all connections are intact

could it just be the stock headunit its self?

if it is the amp under the head unit could i bypass that amp and power the system off of the headunit?

cd player part of the head unit has some lights out so im not sure if this is a hint as to the proble,

All fuses are good.

Answer 1

the amplifiers are in the trunk

the good thing is that they are the same  you can switch them

most likely the  left one is the bad amplifier

good luck