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Old 5th October 2009, 06:41 AM   #71
gainphile is offline gainphile  Australia
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Modelling recatangular baffles are not easy. If you like math, this is a good read. Basically they can be modelled by an equivalent circular baffle:


My path of least resistance is simply to build and measure, with some educated guess from past experience. Wood cost only $3 anyway. YMMV

Again, I can't recommend enough JohnK's modelling tool (ABCDipole). Great $14 investment I think.

Anyway sorry for being off-topic to the OP. I'll shut up now
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Old 5th October 2009, 12:17 PM   #72
otto88 is offline otto88  Australia
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Thank you for your suggestions

ABCDipole is probably a bargain, I must get to it soon.

However JK says rectangular baffles can be modelled by an equivalent circular baffle - at *low Hz, which is useful to know, but at present I was focussing on the upper mids to tweeter transition . .

The article doesn't clarify the measurement or estimate of D . .

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Old 6th October 2009, 09:35 AM   #73
otto88 is offline otto88  Australia
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I realize I largely "hadn’t seen the forest for the trees".

If I understand correctly, JohnK's article and the Edge can estimate the extra distance the sound travels - perpendicular to (at 90 degrees to) the listener–speaker axis. And that’s probably the larger part of the extra distance travelled.

My sketch was focusing on the extra *depth ie front-to-back that the sound from the rear of the cone travels, to get to the same ‘plane’ as the sound from the front of the cone.

So we can use JohnK's article or the Edge for the main part (around the bafffle's width): can someone clarify how to quantify the extra *depth travelled?
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Old 10th February 2019, 11:06 PM   #74
Pawelgreece is offline Pawelgreece  Poland
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Interesting discussion.
My question out of curiosity,

How come Grandinote Mach 9 model with twenty something tweeters in line array avoid comb filtering?
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Old 11th February 2019, 09:34 AM   #75
Juhazi is offline Juhazi  Finland
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^ Grandinote - Mach 9

9 bass drivers with no xo, no eq and 16 tweeter in-line, height of 159cm

Avoiding comb filtering is nonsense, read more in other threads here
Line Array suggestions - 2 way
The making of: The Two Towers (a 25 driver Full Range line array)
Radikal aktivist AINOgradient speaker project
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