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Old 14th August 2012, 01:58 PM   #11
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Quote:
Originally Posted by mondogenerator View Post
....Couldnt you reverse eng to guesstimate, scott? Im not sure there are any secrets any longer!
I think that Scott was referring to what the designer specified as opposed to what is really required. At least that would be my question.

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Old 14th August 2012, 02:47 PM   #12
Bigun is offline Bigun  Canada
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are we sure that we even want a vent ?
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Old 14th August 2012, 04:32 PM   #13
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Quote:
Originally Posted by Bob Brines View Post
I think that Scott was referring to what the designer specified as opposed to what is really required. At least that would be my question.
You read my mind Bob

Quote:
are we sure that we even want a vent ?
It depends what you mean by 'vent' but assuming you are talking about a hole in the box (irrespective of whether it has a duct or tube attached), and again assuming the published data is representative, I would say almost certainly not, unless it's tuned so low that it provides zero useful output. The cabinet is too small to be vented (at least, under the further assumption that a reasonably accurate response is desired).
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Old 14th August 2012, 04:50 PM   #14
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right. Ok. My mistake. Sometimes i regret writing. Anything. Lol
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Old 14th August 2012, 05:27 PM   #15
Bigun is offline Bigun  Canada
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Originally Posted by Scottmoose View Post
I would say almost certainly not
exactly.

Looking at the AN15, the published Fs is already low enough, no need for a resonant port to extend it lower. And I already ruled out adding a 2nd driver, which a tuned port becomes, albeit with a mechanical cross-over.
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Last edited by Bigun; 14th August 2012 at 05:29 PM.
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Old 14th August 2012, 05:43 PM   #16
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What?! No ~aperiodic vent to 'tighten up' this under-damped alignment? Also, FWIW, the pioneers of audio determined that from an acoustical loading POV of point source drivers that the cab's net Vb should be whatever raised its Fs 1.56x, be it sealed or vented, or ~15.15 ft^3 based on the published spec. No clue whether there's any audible difference between 13.6 and 15.15 though. My SWAG is it would be very room, signal source dependent.

GM
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Old 14th August 2012, 06:07 PM   #17
Bigun is offline Bigun  Canada
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My local store stocks Baltic Birch in 2' x 4' sheets. With almost no cutting this makes for a Vb of 16 cu.ft. - less volume of the panels, the driver, and bracing. It's probably going to end up closer to the 13.6 than 15 but I figured this still allows an Fc around high 30's which is just fine.

Damping - adding resistive ports to the back panel could be experimented with as the back panel will be removable & replaceable
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Last edited by Bigun; 14th August 2012 at 06:17 PM.
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Old 14th August 2012, 06:47 PM   #18
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Quote:
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are we sure that we even want a vent ?
I did the 1st pass on an An-Ken for the 15, constrained by the wxd restraints posted by an interested party and they would have needed to be 3m tall. Set that aside for now.

Thinking of a practical box that isn't an OB (which i have never been enamoured of), i was figuring a couple hundred litre, box damped like a boffle with a swiss cheese back (you need a back to make the box structurally strong).

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Old 14th August 2012, 07:05 PM   #19
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Originally Posted by Bigun View Post
Damping - adding resistive ports to the back panel could be experimented with as the back panel will be removable & replaceable
'Sounds' like a plan!

GM
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Old 14th August 2012, 07:49 PM   #20
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Yep, that's going to be favourite.

Quote:
Originally Posted by GM View Post
What?! No ~aperiodic vent to 'tighten up' this under-damped alignment? Also, FWIW, the pioneers of audio determined that from an acoustical loading POV of point source drivers that the cab's net Vb should be whatever raised its Fs 1.56x, be it sealed or vented, or ~15.15 ft^3 based on the published spec. No clue whether there's any audible difference between 13.6 and 15.15 though. My SWAG is it would be very room, signal source dependent.

GM
+1. Since the CSA plans were mentioned, I was largely just dreading they were going to be run as a BR (since their record isn't great when it comes to box alignments ).

Last edited by Scottmoose; 14th August 2012 at 07:52 PM.
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