Does anybody know where this mystery device is located? My left side speakers are not putting out the same level of sound as the right, and yes balance is at "0", but when I swing the balance from left to right, there is a very significant difference in the output. The left is much lower. Also, when the radio is on and the volume relatively low I can hear some hissing or whining feedback, and here's the oddest part (to me atleast) with the radio on and volume relatively low, when I turn on the right turn signal I hear a popping with each turn signal flash, when I turn the left turn signal on I don't hear the popping.

Has anyone else had this or a similar problem?

Where is the bose amp located?

 

left hand side trunk above the wheel arch, LHD driver side - passenger side RHD

 

under the CD player. Thanks