Radio Amp

[talljames]

Hi all, my audio stopped some time ago after a series of loud pops and the rest. I ended up replacing the head unit. The orange light comes on in the head unit but no sound. So I went and purchased a new amp without removing my existing one first (silly me). I now have a small amp unit (the original) and the replacement which is much larger that has dsp written on it. I thought mine was dsp as this showed up on my head unit display for nav. After taking the amp out from the side of the cargo bay, underneath the CD changer, I found that it was a different size and hence put it back.

Does anyone know if there are two audio amps in a 2005 E53 4.4i model?

thanks