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Old 11th September 2012, 09:18 PM   #501
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Quote:
Originally Posted by planet10 View Post
The goal is to push panel resonance as high as possible. They results from Tappan's AES paper

dave
Right, but not my point. A single large hole should give you nearly the same cross panel strength as a lot of little holes. A large round hole is just as effective as a window brace. And note that I stated that panel stiffening is more important that cross panel bracing, which is what you just said.

My current bracing scheme is a crosswise brace at the top and bottom of the driver to tie the panels together and longitudinal braces ( 12mm x 50mm) from the bottom of the driver to the bottom of the cabinet, i.e. picture #5 in your quote.

Bob
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Old 11th September 2012, 09:30 PM   #502
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A single large hole will provide near the same strength, but does not provide the direct solid path from driver magnet to back panel and does not provide the surface area to break up side-to-side standing waves.

dave
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Old 11th September 2012, 11:21 PM   #503
sippy is offline sippy  United Kingdom
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A well placed brace can work wonders, I learnt this on my first diy build back in '97 - a pair of DB 9's from the part kit and artical in HFN&RR, 2 off cross braces spaced un-equally and an angled bottom panel to quell standing waves.
One thing I am certain of is the need to tie the front and rear baffles together, holding a 12lta while its running test tones OR music gently really brings it home why this feature is there.
My front to back braces are all marked out now :-)
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Old 12th September 2012, 07:03 PM   #504
sippy is offline sippy  United Kingdom
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All panels cut including rounding over the holes in the brace
All stock ripped for vent spacers and battens.

So, I'm waiting for the 7pm re-run of the Simpsons then its glueing and pinning the sides together.
Neighbours have been asking what I'm making, guesses ranging from book cases to cupboards, the look on their faces when given the answer 'Loudspeakers' has been priceless, even more so when I showed 'em a front baffle an a top.
(evil laugh) HaHaHaHa
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Old 12th September 2012, 07:19 PM   #505
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Rock on the weekend!! I'll be interested to hear the difference the alt. tuning makes.

soon there'll be 3 pairs out there
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Old 12th September 2012, 07:39 PM   #506
chrisb is offline chrisb  Canada
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All panels cut including rounding over the holes in the brace
All stock ripped for vent spacers and battens.

So, I'm waiting for the 7pm re-run of the Simpsons then its glueing and pinning the sides together.
Neighbours have been asking what I'm making, guesses ranging from book cases to cupboards, the look on their faces when given the answer 'Loudspeakers' has been priceless, even more so when I showed 'em a front baffle an a top.
(evil laugh) HaHaHaHa

emphasis on the Loud part - which they'll be experiencing soon enough

hope you find them worth the wait
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Old 12th September 2012, 07:40 PM   #507
sippy is offline sippy  United Kingdom
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Aye, that there will - so we're still part of an exclusive club. It just struck me, I could / can not only tune the vents symmetrically, but asymmetrically as well.
Dave's thoughts on this would be welcome.
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Old 12th September 2012, 08:18 PM   #508
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Aye, that there will - so we're still part of an exclusive club. It just struck me, I could / can not only tune the vents symmetrically, but asymmetrically as well.
Dave's thoughts on this would be welcome.
When Chris shortened the vents i left myself some opportunity to do some trick tuning. Stay tuned.

I don't know what different length vents would do. Some smoosh of the tuning frequency

dave
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Old 12th September 2012, 10:15 PM   #509
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Multiple ports with different tunings.

Smooshing of the tuning frequency would appear to be correct.

Probably worth messing around with, anyway.

Chris
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Old 12th September 2012, 10:49 PM   #510
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what you going to power them with Sippy?

I thinking of a small class A amp - SEWA looks nice. Really simple before heading into the realm of Papa Pass
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