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Old 2nd January 2011, 09:56 PM   #11
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Mucho gracias! Would rounding over the leading edge of the box help with baffle rolloff. The woodworking part will be easy for me! If Santa is good to me at work, perhaps i can have a pair of Alpair 7eN's.
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Old 2nd January 2011, 10:36 PM   #12
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Would rounding over the leading edge of the box help with baffle rolloff.
As per Olson Page 23, the bigger the roundover/bevel, the smoother the 2pi to 4pi transition. As well they help reduce edge diffraction higher up.

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Old 2nd January 2011, 10:39 PM   #13
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Where can I find this book.
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Old 3rd January 2011, 10:53 PM   #14
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The book is Olson's Acoustics. I think audioXpress sells a reprint. One of the bibles.

Page 23 has been posted so many times i thot you might already have seen it... i'll see if i can trawl up a link.

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Old 3rd January 2011, 10:58 PM   #15
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I am pretty sure I have come across it before, but I have been digesting so much info the last couple of months, specifics get blurry sometime. Thanks for the help!
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Old 4th January 2011, 08:55 AM   #16
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Old 4th January 2011, 09:48 AM   #17
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To implement these different shapes, does the driver circumference have to stay in proportion to the drawn sizes. That looks like a 1" hole, so for a 4" driver, the baffle would be huge. I find it interesting that the spher does not do as well as the chamfered baffle.
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Old 5th January 2011, 12:37 AM   #18
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Quote:
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The book is Olson's Acoustics. I think audioXpress sells a reprint. One of the bibles.
Dave, do you know the year it was published?

~Tom
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Old 5th January 2011, 12:48 AM   #19
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To implement these different shapes, does the driver circumference have to stay in proportion to the drawn sizes
The baffle scales up/down with decrease/increase in baffle & champher/roundover size.

What has been charted is but a small sample set of points in "baffle/box shape" space and define behavoiur at that point. Interpolation is required for more practical shapes.

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Old 5th January 2011, 10:51 AM   #20
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Interpolation is required for more practical shapes.

davve
You had to throw in a new twist, didn't you. I will be investigating this today. On the Tysen design, do i stand to gain anything by executing a dipole, or is it bipole, with the A7. I know i get increased SPL, but is their any other benefit? What is to be gained from a larger enclosure? Sorry about all the questions. I know you guys "in the know" probably get tired of answering them. The forum is so vast it is really time consuming trying to weed though everything.
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