I, like so many others visited the JBL tent sale and bought a 4508 enclosure w/2226J's. I am very familar with JBL's reputation, so I bought it primarily because of the "good deal". Now that I have them, I am not sure that they are the "best" drivers for me. I have a 250+ sq. ft. room that I would like to setup for home theater / music. I have 3 Altec Model 14's for mid bass and up and I wanted to use subwoofers in the rear corners. My questions are: would the 7 Pi 15" design work well as a subwoofer only? Can I get lower bass extension by using a larger box? The corner horn configuration seems to extend the bass response. I will Bi-amp with a bridged M2600 Peavey amp (mono low bass), crossover at

If you choose to build some π speakers and want plans, please don't hesitate to write back.

Do you think that a pair of JBL 2235's would be too small for me to use as subwoofers? Or should I use the 2245's so that I would never run out of bottom end? Do you have a 10 cubic ft. version of the 7 Pi or were you thinking of another design?

Thank you again,
Richard

Since I really like the Altec Model 14 for the mains at 114 max SPL (4 ft), I will use one Pi 7-18" as a subwoofer only. I build my own electronic crossovers and filters using Electronic Workbench V4.1 software and I get great predictable results. It has a Bode plotter (spectrum analyzer) that gives -3Db points, etc. 3rd order filters are no problem and since this subwoofer will be behind the left main at a diagonal, I will need to have as steep a crossover as possible, maybe 80Hz or so. Bi-amping and electronic filters are so great, no passive network loss.

I looked at your Pi 7 design (math) and it looks like "D" is about 12". That constant seems to make the exterior box dimensions come out about 49" x 25" x 13". Do you sell the plans for this design? If so, I would like a set.

I will sell the JBL 4508 W/2226J's here in Atlanta as I really have no use for them. I couldn't believe that JBL had free shipping on this 100+lb speaker!

Thank you again for responding,

Richard

Thanks for the plans. That and some testing in my particular room should do the trick. I will keep an eye out for a 2245.

Thank you for all of your help,

Richard