Guys ,

I bought BMW 540 / 2000 which has DSP sound system but the sound was not working , After they checked it out , the found out that the radio receiver is not working , they replaced it for me with another one ,,

but now the rear speakers are not working , only it gives the bass but not voice from it at all .. is it like this only or the controler that they put for me is non DSP one ... ???

I want to find out as soon as possible because they gave me a few days warranty because it is second hand unit ...

thanks alot in advance ,,