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Can you give more details? I also have an 18 and am looking for more base.On the 18 with BO I simply added a sub and box running off the factory amp, no idea how many watts, but it's a 2 channel, so i run a channel to each voice coil. It's a image dynamics dvc 4 ohm, in a fox acoustics ported box, big but sounds really good and drives really low.