Mtx Capacitor I Have A MTX Thunder Elite 1501D And A 3 Farad Capacitor Running My Ported L7 12" Why NO THUMP What Do I Need?

I have a MTX Thunder Elite 1501D and a 3 farad capacitor running my ported L7 12" Why NO THUMP What do i need? - mtx capacitor

Are taken into 2ohm sub in a field. I am a newcomer to the audio, but here is alink to my amp http://www.mtx.com/caraudio/products/amplifiers/TE1501D.cfm this amp is not compatible? or just garbage.