I have just wired up my amp as stated on the instructions. Connected to the battery and gounded to the Chassis (I think) all fuses are in place and the remote power on cable is plugged into the antenna aerial wire on the HU. Speakers are connected to the correct terminals. When I turn the car on and fire up the HU I hear a noise from the speakers connected to the amp as though something is turning on but that's it. I get no other sound through them. Can anyone help. This is doing my head in!!!