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Old 23rd October 2011, 05:09 PM   #21
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Quote:
Originally Posted by PDRCanada View Post
But a "H" frame has top and bottom....is that something different again?
"H" has only front and sides .... both perpendicular to floor
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Old 23rd October 2011, 06:07 PM   #22
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Ok....what do you call them with a top and bottom as well?.

<------as in my avatar, was always told they were H frames....trying to learn....
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Old 23rd October 2011, 08:26 PM   #23
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Originally Posted by planet10 View Post
It is not an OB.

Top & Bottom are closed off

It will be a 4th order system, i won't say badly, but certainly weirdly tuned TL or BR.

dave
agreed. whether 'reflex' 'qwtl' aperiodic or other, its certainly no kind of OB, slotted or otherwise.

to quote:

rjbond3rd

Speaking strictly as a newb: just consider the cabinet types as lying along a contiuum. Very simplistically and randomly:

OB (TL of zero length) -> TL (long straight vent) -> BLH (long expo "vent")-> BVR (bigger chamber, shorter expo "vent")-> BR (short straight vent) -> Aperiodic (resistive vent) -> IB (infinite volume, neglible vent) -> Sealed (no vent, shrinking volume) etc.

I couldnt have said it any more eloquently, if I had tried. Concise, direct, and astute.
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Last edited by mondogenerator; 23rd October 2011 at 08:29 PM. Reason: how did I miss rj's post?
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Old 23rd October 2011, 09:52 PM   #24
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Hi mondogenerator, I am embarassed because it's really GM's ideas, horribly, horribly misquoted (sorry GM!) and almost completely beyond my understanding. But misquoting GM is not the worst one could do
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Old 23rd October 2011, 10:12 PM   #25
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Originally Posted by talaerts View Post
The thing is, it is marketed as an innovative kind of open baffle. Now, considering that there are 4 drivers, and a narrow open slit at the back, wouldn't it behave more like a bass reflex box?
How about a structurally damped U-Frame?
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Old 23rd October 2011, 10:47 PM   #26
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Kind of U-frame at least. In fact you would be able to simulate such a beast with MJK's U-frame model.

/Erling
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Old 24th October 2011, 10:23 AM   #27
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Originally Posted by talaerts View Post
All, at 6 Moons they cover a speaker that interested me as it uses 4 FR drivers and a ribbon tweeter:

6moons audio reviews: J.A.F. Bombard

Click the image to open in full size.

The thing is, it is marketed as an innovative kind of open baffle.
Now, considering that there are 4 drivers, and a narrow open slit at the back, wouldn't it behave more like a bass reflex box?
Here is another product like it, also claiming to be an open baffle design:
Musical Affairs
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Old 24th October 2011, 10:57 AM   #28
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ah yes, ocellia did a similar cabinet but used 1 phy driver.
http://www.wiredstate.com/forum/viewtopic.php?f=9&t=955

Norman
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Old 24th October 2011, 11:22 AM   #29
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Originally Posted by rob g View Post
Here is another product like it, also claiming to be an open baffle design:
Musical Affairs
Okay, that settles it, I'm moving to Holland. Folks that call a baffle a klankbord are my kind of people!



I think this thing belongs to the same category as console radios, guitar combos, and O'Conner's "detuned" cabs. I suspect it may work by canceling the resonance, rather than damping it. A big part of the appeal, though, is radiating mids and highs out the back (O'Conner's cabs are ported on the front), so yeh, it does function as an OB even though it's not very close to our definition of a "perfect" one.
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Old 24th October 2011, 11:50 AM   #30
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I think that from 300-400 Hz (depending on slot measures) upwards it will have a cardioid polar pattern because the slot will be an acoustic LP filter.

/Erling
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