I recently purchased a Obcon 2000i amp from a friend for $10. I hooked it up to a set of Sony Xplod 12" P5 Subs. The Green Power light came on and sound came from the speakers, but the sound is very quiet. I figured the amp was to small to power the speakers, so I went and bought a pair of Roadmaster 61/2" Speakers (Cheap I Know) just to see the result. After installing the amp to the Roadmaster speakers, the same thing happened. Green light came on, and very little sound is coming from the speakers. The protection light never has not came since ive had the amp. Any ideas as to what the problem could be?