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Old 22nd October 2011, 03:47 AM   #11
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A folded OB ....
The folds contain the
diameter within a friendly
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Old 22nd October 2011, 04:06 AM   #12
tinitus is offline tinitus  Europe
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Nelson Pass: The Slot Loaded Open Baffle Project

OB its definately not, but slot loaded maybe
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Old 22nd October 2011, 05:22 AM   #13
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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.

community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
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Old 23rd October 2011, 01:09 AM   #14
CLS is offline CLS  Taiwan
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No, I don't think it's an open baffle. Maybe the slot shape vent is smaller than an Onken.

And, why whizzer on each of the cone drivers?

Last edited by CLS; 23rd October 2011 at 01:13 AM.
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Old 23rd October 2011, 02:49 AM   #15
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whizzer? On an 8" coral driver, the whizzer pulled down the freq response past 1khz-4khz, helped improve dispersion from 2-4khz, and added some high end past 4khz . I'm sure the fr8 (hemp) sounds pretty good (omega loudspeakers). And you save lots of money when you buy in 100 or 1,000 lot quantities.

I like the design. I'm not sure about pushing an 8" up to 5khz or so.................. I'd like to try the wild burro, but that hump in response would not be my cup of tea without a notch. If I was him, I'd pay someone with test equipment and work up some notch filter values. The seas fa22rcz looks really nice, but I'd also like to see the Z-plot of a bare driver. I don't believe those are measured graphs on the seas "Please see the effects of the two proposed networks". But it does have a copper cap, so the impedence should stay low. And it still has a narrow spike at 3khz.

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Old 23rd October 2011, 03:06 AM   #16
Pano is offline Pano  United States
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Used open baffle the Seas does not need the filter. Pretty as you please.
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Old 23rd October 2011, 03:33 AM   #17
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> Top & Bottom are closed off

Good point ! ....
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Old 23rd October 2011, 02:52 PM   #18
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But a "H" frame has top and bottom....is that something different again?
Life in a northern town.....
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Old 23rd October 2011, 03:45 PM   #19
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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.
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Old 23rd October 2011, 03:58 PM   #20
borispm is offline borispm  Hong Kong
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In my book, it's definitely not an OB. A leaky box, I would say. It's not exactly a U frame as it's damn tapered towards the end, so it should have some interesting interaction.
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