Help pls diagnose audio problem

[Calibus]

Hi,

my car is an Audi B5. A4 tdi avant, 1999.. facelift model..

the problem is as follows:

Simptoms:
1. Front speakers are a lot louder than rear
2. Trunk stock bass speaker works when volume low. When slightly increasing 
volume the bass dissapears..

Its a non bose system, with 2 front speakers with tweeters, 2 rear door speakers, and an amp with bass speaker in the left wall in the trunk behind the panels..

So my question is: do I need to replace the amp??? Headunit?? Or speakers. ???? Where lies the problem ??

thanks allot!!

[Calibus]

Bump, can anyone help me ?

[niedzial1983]

I presume your sound settings are set correct balance fader front back etc ?

Is it an oem audi system or aftermarket ?

[Calibus]

Yes, its set correctly,  its a stock concert 1, with tape..

[Brad-B5]

Hi

 

Have you taken the head unit out and made sure all connections securely in?