Package: (2) Kicker 11S12L7-4 12" Solo Baric L7 Subwoofers Totaling 3000W + Rockville RXD-M4 1500 Watt RMS - CEA Compliant Mono Class D 1 Ohm Car Amplifier + Rockville RWK0CU 0 Gauge 2 Channel Complete Amp Kit + Rockville RKDV12 Dual 12" Vented Square Subwoofer Enclosure + Dual Enclosure Wire Kit With 14 Gauge Speaker Wire + Screws + Spade Terminals Square vs. Round: More cone area results in greater sound pressure produced by the woofer. The massive motor structure of the L7 paired with KICKER's patented square-woofer technology provides extreme output capability, Heat-sinking cast aluminum basket provides a strong motor foundation and maintains low temperatures during long-term operation 6000 Watt/3000w Mono Class D 1 Ohm Car Stereo Amplifier With Optical Coupler Technology. CEA Power Ratings (Rated at less than 1 % distortion): 1500 Watts x 1 Channel at 1 ohm &lt;1% THD+N 1000 x 1 Channel @ 2 Ohms &lt;1% THD+N, 750 @ 4 Ohms &lt;1% THD+N) (Use these CEA ratings when matching and comparing with other CEA compliant brands such as Kicker, Rockford Fosgate, etc) RMS: 1 x 3000 Watts @ 1 ohm / 1 x 2000 @ 2 Ohms / 1 x 1500 @ 4 Ohms (Use these RMS ratings when comparing with great brands such as Hifonics, Earthquake, Soundstream, etc). Peak Power: 1 x 6000 Watts @ 1 ohm, 1 x 4000 @ 2 ohms / 1 x 3000 @ 4 Ohms (This rating is the amount of power the amp can produce for a split second at the peak burst of a song), Bridged Power: 12000 Watts @ 2 ohm (When Two Units are Bridged Together) 0 Gauge Power Amplifier Installation Kit. Designed specifically for car audio systems over 1000 watts RMS to 3000 Watts, Made from silver-tinned 100% virgin copper for a pure uninterrupted transfer of power and signal. The solid brass gold plated ANL Fuse Holder offers ideal protection for high powered systems, Strand Count: 4704 12" Vented/Ported Square Subwoofer Enclosure. Designed For Square Subwoofers Such as The Solo Baric L7/L5/L3, Machine precision cut mounting holes.  USA Heavy Duty MDF Construction, Top of the line Glue for extra durable adhesion. High quality GOLD spring loaded terminals, Designed, tested, and engineered to work perfectly with 12" Kicker Solobaric L5 or L7 subs.