New deck lack power to the speakers (Sony CDX-S2000 in BMW e34, original speakers)
I recently bought a used Sony CDX-S2000 to use in my BMW e34. The problem is that it seems like it really lacks speaker power. I have to turn the volume up to 3/4 to hear it, and to maximum to have a comfortable sound level. At 3/4 the sound is pretty good quality (although very silent), but when turned up it gets really raspy.
As some of you might know the original e34 speakers only take + from the deck, negative is wired from somewhere else. Could the Sony deck have a problem with this?
The Pioneer cassette deck I got with the car has no problems with it what so ever, and the sound is very clear and good considering it still has the original speakers.