Replies to this should probably go off-list now :) Let's see, each woofer is 8 ohms, so I have each side wired in parallel to their own 1/4" socket on the back, so they'll show 4 ohms. My head has two speaker jacks, so I can have it see 2 8 ohm speakers, or wire in a homemade adapter so it will see a 2 ohm load. I've been thinking about wiring in some DPDT switches, so I can flip each side between 2 & 4 ohms. Depending on how much you travel with those speakers, here's how I would set up the boxes... - 15" in a ported box, all by itself. It'll be heavy. Nice boom for the bottom end. - 4 x 12" in a sealed box. Good tight response, but still has the bottom. This could be used by itself quite nicely. - 8" (or two) in a sealed box with a good horn tweeter. This would go best used with the 15" cabinet, and an appropriate crossover. Maybe your amp has one built in*. It will also be good for practicing by yourself. Nice & tight response, and great if you play some funk style too. * My Peavey does have a built-in adjustable crossover, but it's pre-amp level. I then have to amp each side after that. One would get looped back into the Peavey, and the other to a second power amp... And hopefully you know the make and model numbers for those woofers. That will be required if you want to build the best boxes possible for them. I picked up the 2 speaker design books from Radio Shack to help with the box design. Blaupunkt also has a basic DOS program to help with box design too. The RS books had some decent rough size info for speakers, so I assumed some average-low specs for my 12s went I calculated the box size. I know the box is a little small for them. you can kinda hear it. But I don't have the test equipment needed to find the real specs for these drivers, yet :) I'm working on a spreadsheet that has all of the formulas built in, to help design different boxes. I'm not sure if I have it finished yet or not, though... -- --- David A Woyciesjes --- C & IS Support Specialist --- Yale University Press --- (203) 432-0953 --- ICQ # - 905818 Mac OS X 10.1 - Darwin Kernel Version 5 Running since 01/22/2002 without a crash