The Rockville RVB12.1A is a 12" powered subwoofer that gives you everything you want out of a car subwoofer. This is a complete system with the subwoofer, enclosed in a box, along with a built in amplifier. This sub system will give you more bass in your car or truck, without giving up tons of space to get it. I'm sure you want the tight clean bass hits that 12" subwoofers are known to provide. I'm sure you also want the ease of a quick installation. With the RVB12.1A you will get it all. You will not have to do a separate amplifier and woofer installation. It's just one and done. The Rockville RWK81 8 AWG (American Wire Gauge) amp kit has the following diferences 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. 3. We do not cheat you on the thickness of the wire. These are standard American wire gauge thickness. This is another reason our conductivity is better than anything else at this price point. Other brands in the market place write 8 gauge, but cheat you on the thickness. We are honest about the thickness. 4. The Rockville amplifier installation kits feature a new soft abrasion proof insulating jacket. This rugged PVC outer jacket allows for 100% improved flexibility over standard power cables making them extremely easy to route through your vehicles interior, and it maintains exceptional resistance to grease and oil. The PVC outer jacket can with-stand an extreme temperature range of -40 to 220 degrees F.