if you have plenty of space for a sub, build an F20 or THT (as mentioned earlier). You will spend less on drivers and have less of a power requirement. Even a decent home stereo receiver or amplifier will give you surprising output, you may already have something like this laying around. YOu will need an eq, but for $50 on ebay you could pick up a Beringer Feedback Destroyer and use as a parametric EQ. OR....get an INUKE 1600DSP or 3000DSP, which will have the eq and limiters built in.