Installing aftermarket radio in an 02 Grand Am with Monsoon?

So I have an aftermarket radio that I am trying to install. I'm not having any issues with the door chime like most people. I researched that before hand and bought an adapter for it. The issue is with the factory monsoon amp. We have all the wires to the speakers attached properly. The stereo turns on and has no issue finding a station, however no sound is coming from the speakers. My first thought was that we had the speakers wired wrong. We double checked and the wiring is correct. Could the stock monsoon amp be causing the issue here?