I had a Sony stereo in my truck and the remote circuit went bad, so I have installed a new Alpine UTE-52BT stereo. I have a 4 channel amp for my rear subs and front speakers. When I initially connected the stereo, it started buzzing. I was able to find the setting for the external amplifier, and now I have audio from just my rear speakers. If I turn the volume up past 12 or so, the subs start buzzing. Below is an image of the settings on my amp. I'm not sure what my stereo settings should be to work properly, or if it's a wiring issue somewhere. Thanks in advance.
http://support.alpine-usa.com/products/documents/OM_UTE-52BT_CDE-153BT_EN.pdf
http://support.alpine-usa.com/products/documents/OM_UTE-52BT_CDE-153BT_EN.pdf
