pioneer avic n1 06 avalanche

I installed the Pioneer AVIC N1 using a Peripheral GMAH24B,  And I don't  have much sound;  you have to turn it up almost all the way to get a little bit of sound.  What gives?  Please give me some ideas.

Thanks,

Todd

I'm not familiar with the peripheral unit but, the one from scosche that I normally use has RCA inputs for the bose systems in Chevy's and if you have the bose system and don't use the RCA's thats exactly the problem that you get. Hope this helps.

--->Richard