This project actually had three stages that ended with a kicker warhorse amp. I started with 2 15 L7's in a 10 cf box with 2500 watts. Then came 4 15 L7's in a wall with 2500 watts. Then came the Warhorse 10000.1 amp. The first system was louder than anything I've ever had but it didn't have the extreme look I wanted. This was going to be my dream build so I wanted everything perfect. Next up I built a wall where my back seat once was and installed 4 15's with the same 2500 watt amp that I had powering the first system. This one moved a lot of air, I was able to do my first small hair trick. It was impressive but I knew I was underpowered and completely loosing my rear window sucked, I needed more power. Then one day talking to my local audio shop, I came into a deal I couldn't refuse and before I knew it I had the warhorse amp at my house with 40 ft of kicker 0 gauge wire and a pile of kicker fuse block holders. After much deliberation and trial and error, I built the last and final setup of 4 15 L7's, side by side, each with 3cf, going from one side of truck to the other. Perched atop the mass of subs was my center piece the Warhorse, which I tilted at an angle to give me approx 1/2 of my rear window. With my current setup of 5 optima yellow tops and 1 DC 270 amp alternator, I have the warhorse limited to around 5000 rms. This ended up being the perfect setup for sound, look, and longevity, being this is a daily driven truck. The amp is only working at 1/2 power and giving a nice clean 1250 rms to each sub. When more power is needed I have the ability to turn a knob and have the full 10,000 watts available. The amp truly gives you the ability to go from mild to wild within seconds.