A few months ago I switched out my Pioneer DEH-P80MP for a Kenwood KIV-BT901. As soon as I powered it up, I noticed it was very quiet compared to the Pioneer. I had to max out the gains on my DLS A4 to get acceptable sound and even then it wasn't as loud as it should have been. I was getting some ground noise, so thinking it was a loose connection I finally got around to checking things out tonight and I'm in the same position. Any ideas what could be causing this?