I just got a pair of One Pi kits and a pair of Two Pi kits. I am really pumped.

best regards,

Walter Owens
Garland, TX

I have several designs that you could use for a subwoofer. Most are intended for a drivers like Omega's, Kilomax, Magnums or JBL Pro drivers. So they're high power solutions using drivers from about $150.00 up.

If you build your two π speakers in the tower configuration, I don't think you'll want for a subwoofer.

The push-pull plenum horn we've discussed here is probably a bit much for what you're wanting. But the push-pull idea could be easily implemented in something else. What I'd suggest you consider is a pair of Alpha 10's configured in a push-pull configuration in a box from 3.5ft3 to 11ft3 tuned to 40Hz. This could be a bass-reflex box or a π cornerhorn. If you have the corners, go for the latter. It's attractive and it performs very well. It will hide the exposed magnet so it's a nice way to implement the push-pull arrangement, in my opinion.

Wayne

Could you put a tweeter on it and have a "super two pi tower"?

Good corners are hard to come by in my house. For subwoofer purposes could I face the drivers toward the wall (to hide the "backwards" driver)?

regards,

Walter Owens

I think I'd mount the two Alpha 10's one on top of the other, physically close together. I'd put a crossover on each Alpha 10 driver, but I might consider staggering their values. If they are allowed to both reach 1.6kHz, then you'll have three sound sources in the octave around 1.6kHz or so. So I think I'd proably crossover the bottom woofer at 200Hz or so, and then let the upper one reach all the way up to 1.6kHz. That will prevent them from cancelling harmonics above 200Hz, but I'm not sure the push-pull arrangement remains effective as frequencies go up anyway. I'd expect shorting rings to work better through the midrange, and push-pull arrangements to work better in the bass.