Alpair 12 Open Baffle Designs - Page 3 - diyAudio
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Old 23rd June 2010, 10:06 PM   #21
Urchinn is offline Urchinn  United States
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I'm not finding any photos of an "H frame." Could someone post a pic of what the heck it is? Thanks
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Old 23rd June 2010, 10:30 PM   #22
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Quote:
Originally Posted by Urchinn View Post
I'm not finding any photos of an "H frame." Could someone post a pic of what the heck it is? Thanks
Check out the first page of this thread, post #8. Abertli has a snapshot of his (nice)system up there. His open baffle Alpair 12's are sitting on his "H-Frame" woofers.

An H-frame is basically a shallow, square box with no front or back. Instead it has a baffle in the (approx.) middle in which the woofer is mounted. It doesn't really resemble an "H" all that much.
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Old 23rd June 2010, 10:41 PM   #23
mightym is offline mightym  United States
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Quote:
Originally Posted by gurley123 View Post
Check out the first page of this thread, post #8. Abertli has a snapshot of his (nice)system up there. His open baffle Alpair 12's are sitting on his "H-Frame" woofers.

An H-frame is basically a shallow, square box with no front or back. Instead it has a baffle in the (approx.) middle in which the woofer is mounted. It doesn't really resemble an "H" all that much.
Cut one in half horizontally, and look down from above....
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Old 23rd June 2010, 10:47 PM   #24
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Cut one in half horizontally, and look down from above....
What?...and ruin a perfectly good frame .
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Old 23rd June 2010, 11:09 PM   #25
mightym is offline mightym  United States
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What?...and ruin a perfectly good frame .
Do it Metaphysically....Man....Saws like make waaayyy to much noise and harsh my buzzz.
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Old 23rd June 2010, 11:44 PM   #26
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Great timing on this post, I just inherited a pair of OB panels from Phil Townsend that he had a 6 1/2 inch Feastrex and Altec 416 B (GPA) drivers in each OB. I have a pair of Altec A7's that I am going to refinish cabinets and was looking to build (or get) another set of speakers in the meantime. Well today decided to try the Alpair 10 with my 416A drivers below . I will use Phil's digital crossover to find crossover point and then build to exact measurement. Really looking forward to hearing the Alpair and having a different sound. Love the A7's but a second speaker system is always fun to swap out.
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Old 24th June 2010, 11:24 AM   #27
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I know I love to swap out stuff.
I think I rearrange setups more often than my wife switchs purses !!!!!!!!!!!!

Norman
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Old 24th June 2010, 02:46 PM   #28
hayenc is offline hayenc  United States
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Quarter Wavelength Loudspeaker Design
Quarter Wavelength Loudspeaker Design

Martin's web site is the best place to start on H-frames. I built both the 15" Eminence and the 18" Goldwood GW-1858 from his designs. Search this forum for the GW-1858 and you will find plenty on H-frames.
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Old 14th July 2010, 05:24 AM   #29
LuisF is offline LuisF  Portugal
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I'm building my first OB, need some advice on crossover values for MJK OB plans with Alpha 15A and Alpair 12?

LPF - 68uF/9mH
HPF - 30uF/3mH

Thanks
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Old 6th November 2010, 11:59 AM   #30
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any new news ?

I'd think a 3' wide baffle should get most drivers down to 150hz (just below the Feq).
Just a driver on a board, no x-over, no woofers.............


Anyone ?

Norman
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