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Theater Seven Pi Question. [message #51512] Sun, 28 October 2007 15:25 Go to next message
Ed White is currently offline  Ed White
Messages: 34
Registered: May 2009
Baron
This is just a suppose, thinking out loud question.

If a person's Theater Seven Pi's were, well, in the corners of the listening area, but 15 feet apart, and the listing spot was not perfectly optimal...say in a square room. Mine is square. Would it be possible or at all advisable to have the midhorn/tweeter setup on separate stands inside the bass units...say 8 feet apart? The bass units being in the corners of a 15 ft wide room and the mid tweets being located between them on stands at listening.

Will that mess up imaging?

Re: Theater Seven Pi Question. [message #51514 is a reply to message #51512] Sun, 28 October 2007 20:13 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18678
Registered: January 2001
Illuminati (33rd Degree)

You don't want to do that. The midhorn needs to sit squarely on top of the bass bin for several important reasons. The midhorn and bass bin need to be within 1/4λ of each other for proper summing. The crossover depends on that. That's the main thing, really, and is a deal breaker for remote positioning. The midhorn doesn't go low enough to be placed remotely, because you would need a lower crossover point, like what you might do with a subwoofer.

There are also other reasons for wanting the midhorns in the corners on top of the bass bins. One is that the corner helps smooth midhorn response. It is physically large, but it is acoustically small at the lowest frequencies. Corner loading helps make it act like a larger horn and smooths its response. Also, the π cornerhorn design uses sound sources that radiate 90°, matching the expansion of the room corner. Each sound source is toed in 45° with a pattern that covers 45° on either side. This creates a uniform reverberent field. When moving the midhorn and tweeter away from the corner, you lose these benefits.


Re: Theater Seven Pi Question. [message #51518 is a reply to message #51514] Mon, 29 October 2007 12:22 Go to previous messageGo to next message
Ed White is currently offline  Ed White
Messages: 34
Registered: May 2009
Baron
Aha.

I'm making the midhorn/tweeter as a one piece removable unit, and was trying to understand the placement envelope of these as it's design parameters allows. God knows this thing would be a beast if were all built into one cabinet. You'd need two men and a truck to move it.

It was just a thought.

Has anybody ever done a center channel with these guys...kinda like the old Klipsch method? The Sevens in the corners and maybe a 4 pi in the center with the old school center channel wiring setup?

Building stuff tends to put you into a sorta mad scientist mode, I'm afraid. It's fun to play with ideas, though.



Re: Theater Seven Pi Question. [message #51519 is a reply to message #51518] Mon, 29 October 2007 15:26 Go to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 18678
Registered: January 2001
Illuminati (33rd Degree)

You're right, making them as a single unit would be a bear. We build them as three pieces and pin them together:

For center channel and surrounds, I'd use three π's or four π's of the same line. Surrounds could be one π's or two π's.

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