| Studio Pi Speakers variations? [message #61425] |
Fri, 20 November 2009 12:43  |
KTuttle
Messages: 3
Registered: November 2009
Location: Durant, OK
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Esquire |
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I'm considering some of the variations of the Pi Towers, interested in some of the variants that are shown on the fredt300b photos. Some are tuned differently and others have used gr and Vifa tweeters. And are some labeled Studio's? Which combos have better synergy, as far a sounding better together?
And, is there info to look at for Fred's Selah Audio Texas Revelator Towers? They too should have higher WAF than my
LaScalas.
Back to listening to Downright, Upright!
Kevin
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| Re: Studio Pi Speakers variations? [message #61428 is a reply to message #61425] |
Fri, 20 November 2009 15:38  |
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Wayne Parham
Messages: 18783
Registered: January 2001
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Illuminati (33rd Degree) |
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People have made various modifications over the years. Some I think are probably fairly "safe", others not so. The Studio Series are probably OK to modify to some extent, as long as the woofer and tweeter are kept fairly close together and you take care with the box size, shape and tuning. I'd probably want the woofer and tweeter in the same plane vertically. Box size can vary somewhat, as long as the Helmholtz frequency is maintained. This is pretty easy to model with a BR modeling program, and you can expect good results.
What's a little harder to understand is the effect of standing waves inside the box when you stretch it to make a tower form factor. That's a convenient shape, but I'd definitely model it with Martin King's spreadsheets, and measure the end result to be sure it's working right. Once a box becomes sufficiently tall and thin it starts to act like a tuned pipe, with standing wave resonances in addition to Helmholtz resonance. In this case, it is important that the woofer and port location be right, or else you can get some pretty serious ripples in response.
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