I might could use a cornerhorn - but in one of the corners there is only about 3 ft of side wall before there is a french door that indents about 3" or so from the trim. I usually leave that particular door closed.

BTW Kudos to Michealz for his implentation below. I also like David Shanks Implentation although I'm not sure I have enough wall space for that configuration

I'm using 1 meter fiberglas horns with a LeCleac'h flare that I plan to crossover at around 135hz or thereabouts.

I'm using tube amps (300B's now, GM70 later) and would probably run the subs active and push them with some rebuilt Dynaco MKlll's.

Appreciate any and all input on this. I've just started looking at this aspect of my system.

Thanks

Ken L
Greenville SC

But if you can't use corners, then the horn you need becomes very large. If that's an option for you, then something like the ten π works very well. But even that is tuned to be used above 40Hz and in constrained space or in multiples. That's the problem - to get down into the bottom octave, you just really need size. Most guys running horn subs add EQ for the bottom octave, which goes to show that they aren't acting as horns down there. That means that - for the bottom octave - they're direct radiators in fancy boxes. This is true for all the popular basshorns discussed on these forums.

But this is probably a debate about semantics. There are lots of people that really like the power a large-format horn can deliver down to 40Hz. I'd suggest the ten π might work very well for you. They deliver solid output down to 40Hz, and they are able to deliver extended response as well. This makes your choice of crossover much easier - You can cross them low or use them up fairly high. The rising response of the driver combined with the diagonal reflectors allows smooth response at high frequencies, almost to the limits of the driver, itself.

For placement, I'm probably ok on one side - there is a five foot window that has shutters - probably not great but hopefully OK if shuttered

I just might be OK on the side where the French doors come in - If I leave one of the French doors closed I'm getting the dimensions I need on two sides and almost on three - if there is an imperfection in the layout of one of the three sides does it kill the effect you're looking for completely or just make it sloppy?

Do you have anything you can send me that has the dimensions and set up of a Pi 7-18??

Thanks

Ken

I am

goodies
at
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Lots of people run cornerhorns in positions where there are bay windows nearby or other similar situations. You don't need everything to be perfect to the inch, not even within several inches. Wavelengths are long for the bass, so variations that are measured in inches aren't much concern. It's just that if you don't have corners because of an entryway or very large obstruction then the boundary conditions aren't met.

Well, about an hour ago I fired up my just completed subwoofer for my A7s: LAB12 driver, downfiring in a 145L box, 4" Dia X 12" vent, crossover at 100 Hz. Is it perfect? How do I know. Is it all I hoped it would be? Yeah, and then some. Those Kodo drummers are getting a workout!

FWIW.