Description of W8K9D2:

Vented Hole on T-yoke Enhances Heat Dissipation. Special Custom Rubber Boot Magnet Covers Make the Woofer Look Nice and Protects the Magnet. Custom Rockville Mounting Gasket Looks Beautiful and Makes it Easy To Mount the Subwoofer Air-Tight. High BL Magnetic Motor Gap. We use the highest grade black glue that handles extremely high temperatures which allows our woofer to handle even more power than they are rated. Poly cotton spider with very good elasticity. Cutout Diameter: 7.76" inches. Mounting Depth: 5.91" inches. Frequency Response: 48 hz- 800hz. 10mm T-Yoke + 10mm Washer. Sensitivity: 81.2dB. Sealed Enclosure Volume:0.28-0.42 Cubic Feet. Vented/Ported Enclosure Volume: 0.64-0.92 Cubic Feet. Weight: 18.74 Lbs. Shipping Weight: 20.95 Lbs. Shipping Box Dimensions:11.42"x 11.42"x11.81" Inches.

Description of dB14:

The dB14 is a class D monoblock high power amplifier with 4,000 watts peak output, 2,000 watts RMS output, and 1000 watts CEA-2006 rated power. All of the mono amplifiers in the dB series are 2 ohm stable. They are all CEA-2006 compliant, which makes it easy to compare this amplifier to other CEA compliant amps on the market. Here at Rockville we offer the best value in car audio.

Description of RWK41:

The Rockville RWK41 4 AWG (American Wire Gauge) amp kit has the following differences over other amp kits on the market at this price point. 1. Our RCA cables are 100 % copper. These are top of the line RCA cables 2. Better Resistance: The only thing that really matters with wires is the resistance rating. This is a measurement of conductivity and how much signal is loss per foot of wire. Since Rockville wires are made with around 3 times as much copper as any other wire at this price point, these wires had a much better resistance rating which means they will transfer more power to your amps than the other brands.