I installed a Pioneer VSX-LX301 with a new Samsun curved TV. no problem hear with the front, center and main speakers. My problem is, there are for other rooms with celling speakers ( two in each), all the speakers are wired to a Amp Protector and then I have two sets of wires coming from the amp protector that I put into the zone 2 surround sound. Each of the four rooms has a speaker volume switch to control the volume for that room. However the volume is very low and I need to turn the knob all the way to get sound? What could this be?