H3Eric, I tested it out last night. I don't notice any difference in the volume output with the new radio from the old. Sounds the same for me. They did not install anything else. Just swapped out the radio. I kind of like the 6 disc changer, the cd's sound great! even with the standard speakers! Originally, I thought just by putting in this stereo that it would allow me to have XM but after f5fstops help on this thread it turns out I need to buy the kit with the XM module and attach it in the dash in order to add XM to the stock radio. I plan on purchasing the Terk XM kit in the near future and adding it to the stock stereo. My only challenge is that I want to use the OnStar/XM antenna already on the vehicle and not add another one. But I'm sure it can be done.
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2008 Hummer H3 Alpha Adventure. Graphite Gray Metallic.
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