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A week ago I had Bestbuy install a dvd flip out HU in my 97 C5. I do have the Bose factory system, I asked him if I needed to get the bose interface and he said no. They installed the new radio but it hardly had any bass output ( the factory radio sounded much better). I turned around and went back and they tore it back down again. This time I did have bass however on my way home the sound would go out if I turned the volume way up. No matter if it was the radio, dvd or usb the sound would go out if turned up. I would have to restart the radio for the sound to come back. I believe the bose amps are clipping under load. I've done a lot of reading since this happened and can't find anything on what can happen if the interface isn't used. Bestbuy will be putting this interface in for me (free of charge) this weekend. Has anyone had this issue? Shouldn't installing the interface fix my issue? I think it may be from the difference in omh's between the aftermarket radio and the bose system. Please let me know if this sounds like I'm on the right path.
I JUST purchased a new stereo for my 97 from Crutchfield. Their website recommended the Metra and it was 1/2-price with the purchase of the head unit. I also got the mounting kit and antenna adapter for free too.
Sonic Electronix was $8 cheaper for the combination of stuff but then I discovered a $20 off coupon code (3A325) for Crutchfield and I went to the American Airlines eshopping website first so I could get 3 miles per dollar.
If you buy the Metra, then google it first. I found it for about $60 - $70. I think Sonic Electronix had it for $69.99 with free shipping.
I fitted the Soundgate GMCRV1 when I installed my AVIC N1 years ago. It's been superceded by later devices but it looks like the Metra kit does exactly the same job.
The symptoms you have are exactly what you'd expect if you don't fit the interface.