In the mean time, I have a few questions:

1. Has anyone tried using sand to fill the back part of the cabinet instead of expandable foam? Yeah, I know that would make them really heavy but they'd only get moved once. Any sound advantages or dissadvantages to this? Any idea as to HOW MUCH heavier this would make the speakers?

2. Lets say I have to use the expandable foam. How much is needed per pair and what does it cost? (I have to figure that into the budget also) Is there a specific brand name that works best and where do you get it?

3. Lets say a fella wants to build a 10 pi but wants to put the HF into another cabinet that sits on top of the 10 pi. Would the chamber for the JBL 15 have to be made a bit smaller to compensate for the airspace that the HF would have displaced?

4. How seamless do these speakers sound between the HF and midrange? If I like the way these sound I may build another pair to be used at home with my 2A3 amps. Or would I need to stick with the Thermionic Series or Theater 4's? If I went with 10 pi's I would probably eventually bi amp with the 2A3's on top and a bigger tube amp or SS on the bottom.

Eat Mo' Hot Sauce,
crazychile

Maybe what you could do is fit rubber bungs in the side of the cab for the top and bottom spaces. Move the speaker into position, and then funnel the sand in. If you wanted to move them later, you might be able to tip them over (with a lot of help) and tip out the sand.

Have you got strong floors? This sort of treatment could get 10Pi's sounding even more 'solid'.

The ten π horn was originally designed for 40Hz to 400Hz operation, and most often crossed-over at 200Hz, using a midhorn and tweeter above them. But the reflectors promote HF propogation through the horn, so it can be used much higher than intended. There are side-to-side modes, naturally, but as an experiment, I used them in two-way speakers and they sounded remarkably good.

The thing is, π horns are large. For a personal system, you'll probably find that they're too large. Most people prefer a little bit smaller speaker for their homes.

A couple of weeks ago I watched "Monster Garage" for the first time and they were using expandable foam on a vehicle so it could double as a boat. The stuff they used came in a gallon can and they may have had to mix it. If anyone knows what this is, it might save some money over buying a case of aerosol cans?

I get a funny feeling inside when I think about 10 pi's in the "guy" room. No nancy-boy speakers for me! I could place them on the big wall below the Elk head and my poster of the Snap-On Tools chick. I feel my neck gettin a little redder already! GOD BLESS AMERICA!

This is just too much fun....

Eat Mo' Hot Sauce,
crazychile