I just swapped an OEM navigation unit into my H3 which had the basic single CD/XM stereo in it. I am very pleased with it overall, but I think I need a different amplifier as the sound from OnStar and Navigation prompts are pretty low and the stereo doesn't crank as loud as it did before.

Anyone have the P/N for the amp that the Nav unit uses (I think it is the same as the Monsoon system) ?
Or, anyone know of a plug & play aftermarket amp I can use and keep the XM/OnStar?nav unit happy?

Thanks,
Paul

 

Isn't there a way to TURN up the volume just for the Onstar/Nav prompts? I know I can on my Eclipse?

 

Yes and it too is turned all the way up. Turns out that the basic stereo has an output of 60w while that of the nav unit and the Monsoon system is 4-10w and both use a seperate amplifier - at least that is what i am understanding now.
Paul