Alpine MRD-500...but there alternative to this... any mono amp would be better... put the sub throught 400 or 500 RMS into them ...make them sound great have 500RMS in mine x2 (and there 10") 600 RMS is getting risquy but herd ppl pushing 600RMS into those subs... any mono amp would be better then what you have and any other brand except sony...lanzar...audiobahn...(dont know about there amp but subs are not so good anymore)all those cheap make..

 

you need a amp that car do 300 rms @ 4 ohms since your gonna be running one sub.

 

If you want to maximize an amps power on one 4 ohm sub get a 2 channel and bridge it at 4 ohms mono. What is your budget on this amp?

 

if you already have the sony use it i am and they are pretty good everyone on here hates em but i use em and get pretty loud