I have infinity 60.5cs components and until today I had them running off my headunit. I bought an older sony 4 ch amp but am only trying to use 2 channels at the time. I hooked everything up and im pretty sure its right but when I turn the radio all the way up I can only hear very faint music and only from the right tweeter. I checked the rcas and the gains but theyre both set so that they should be playing. Any ideas? Or do you think the amp is just a bust