radio problem

Trying to get a 97 Altima ready for my daughter to drive. Radio only plays out of right tweeter on dash and not loud. I put in an aftermarket radio with wiring adapters and got nothing. I did have to ground it for it to work. It comes on but no sound at all. I find it hard to believe all the speakers are bad. My question is, I see these two boxes mounted under the rear deck, are they amplifiers and can they be bypassed if they are bad? Any suggestions would help. Thanks.

Trying to get a 97 Altima ready for my daughter to drive. Radio only plays out of right tweeter on dash and not loud. I put in an aftermarket radio with wiring adapters and got nothing. I did have to ground it for it to work. It comes on but no sound at all. I find it hard to believe all the speakers are bad. My question is, I see these two boxes mounted under the rear deck, are they amplifiers and can they be bypassed if they are bad? Any suggestions would help. Thanks.


What you see under the deck are the rear speakers?
Is the original factory a Bose system? From what I have read Bose systems have extra components and hooking up a non Bose radio to them will not work.

Well, as it turned out, all the speakers were blown. What are the odds? The boxes were amplifiers. I guess thats how the previous owner was able to blow all the speakers. Thanks for the input.