i have 12 in. Alpine Type-R thats 1500Watt and 500 Watt RMS in a Bassworxs ported box, selling with a 1800 Watt Kenwood AMP... Had the system for 2 months now, still have the boxes... Sub hits every note, hits very hard for one sub, but still sounds very clear... Selling the set up for 425 OBO. If u want an new amp kit i can get you one for half price from best buy, its a Rockford Fosgate - 4-Gauge Amplifier kit. priced at $105.99 i can get it for $50.00...