About how to start the project, at least Here is the idea. I have a couple of DefTech ProSub 100's around. They sound HORRIBLE. And I do mean it. I was thinking going the DIY route, but I fear the drivers' are crap. So I'll only be saving the spikes and the on-board amplifiers. This is what I have to start: A pair of 125-watt amplifiers, with variable crossovers.[/list=1] This is what I'd like to accomplish: Seamless integration with a 6 channel speaker set made up of Promonitor 80 speakers, which have 4" mid.bass cones. The system will be installed in my living room. It'll be exclusively used for DVD-A. The speakers will be powered by a 100 watt receiver. Nothing fancy, probably a Yamaha with ProLogic II and DTS Neo.[/list=1] This is how I intend to do it: I wouldn't mind either a 2 or a 1 driver system. I have two amps to power it, though, so I think if I go the 1 driver route I'll need a multi-tap driver. I really don't mind physical size. The sub will be hidden in the bar of my house, so it can be as big as needed. I don't mind the size of the drivers. I'm looking for the highest efficiency I can get, though I'd prefer a sealed over a ported design. I thought a lot about a sonotube design, but it'd be far easier to me to build a boxed design. And it'll look completely integrated with my bar, too! I know what I want, but I don't have a clue! Worst of all, I live in Mexico, so I'll have to buy the driver in the States, and either have it shipped or send it to my sister, who lives in NJ, and pick it up later. I'd be very glad for any help or pointers you can give me in building this beast. I want the best low-end performance I can get, so I don't mind buying a huge driver, or having to build a huge box. Consider, though, I only have 250 watts of RMS power to do it. Is it an impossible task? As long as it sounds terrific, I'll build it. There is no WAF involved (yet), so I intend to use this as an advantage. Thanks for any help you can give me! Javier.