Did you set your gains properly on the amplifier? Is your head unit output correctly turned on and providing the right output. Are all crossovers set accordingly?
Wiring wise you need power and ground going into the amp, and a remote turn on lead. You need a signal through RCA'* as well. Make sure all 4 of these wires are good on both ends
Also make sure your signal wire between amp and sub are on connected properly.
Make sure your subwoofer output is on if you have it.
Make sure all crossovers are off on the head unit and the amp
play a cd with bass
'06 Vee Dub GTI 2 door Tornado Red
- 2.0 Turbocharged, Intercooled, Direct Injected, 6 Speed DSG, Underbody Aero, 17" Classix
- Moonroof, Bi-Xenon headlamps, Interlagos Plaid Sport Seats, 6 Disc In-dash, iPod integration, GTI Monster Mats (winter)
'93 Bonneville SE Purple Pearl H4U package - picked up June 23, 2003, Traded-in June 28, 2007...