Posted by Wayne Parham [ 70.234.158.33 ] on January 31, 2009 at 12:23:55:
In Reply to: Re: Surrounds to complement 7pi and 4pi HT posted by coctostan on January 30, 2009 at 21:23:09:
Of course, any modifications will affect performance in some way. However, the one π and two π model speakers are perhaps less sensitive to changes since they are not constant directivity speakers like the three π, four π and cornerhorn models. Speakers designed for uniform directivity can be adversely affected by movements in the positions of the drivers with respect to each other, so design changes have to be carefully considered.
You have a little more wiggle room on more traditional two-way speakers with first-order crossovers like the one π and two π models. Keep the box volume and tuning frequency the same and you can expect bass performance to be pretty much the same. Don't make one dimension significantly longer than the others though, at least not without further analysis. This can introduce pipe modes that should be considered and possibly mitigated.
Another thing, even though baffle position isn't as critical as the larger models, I'd still maintain the same woofer/tweeter physical relationship as shown in the plans. Keep the tweeter close to the woofer, and on the same plane vertically (one on top of the other) or very close to it. You can offset both drivers to one side or another if you wish, but don't offset the tweeter centerline with respect to the woofer centerline. I've done some speakers that way, but never more than 1/4λ at the crossover point. I prefer the vertical nulls to be above and below the speaker, not offset to the sides.
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