3015lf TH @ 35-40hz but only 20" deep help - Page 2 - diyAudio
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Old 27th March 2011, 08:42 PM   #11
justint is offline justint  United States
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so thats really all there is to this box? 1 board down the center basically, no angles no nothing? Just pull out the saw and glue and i bet i could do one of these in under 2 hours if I tried
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Old 27th March 2011, 09:04 PM   #12
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by justint View Post
so thats really all there is to this box? 1 board down the center basically, no angles no nothing? Just pull out the saw and glue and i bet i could do one of these in under 2 hours if I tried
Yes, It's that simple, This week I'm gluing a very similar sized box (T-QWP) using the same driver for a friend to be used in his recording/mixing studio.

b
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Old 27th March 2011, 10:03 PM   #13
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This thing can be made from one sheet of ply! (with minor changes).
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Last edited by Don Snyder; 27th March 2011 at 10:09 PM.
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Old 27th March 2011, 10:58 PM   #14
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by Don Snyder View Post
This thing can be made from one sheet of ply! (with minor changes).
Great, This will save money,especially if using Baltic Birch.
The remaining leftover wood can be used to reinforce a detachable driver access-lid and maybe pieces glued to brace the top and bottom too.

b
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Old 27th March 2011, 11:57 PM   #15
Djim is offline Djim  Netherlands
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Quote:
Originally Posted by Don Snyder View Post
Hi Justint - This TH is 17.5 x 21 x 60. The 21 inch dimension can be reduced to 20 or even 19.5 without doing much harm. Attached is a text file that can be imported into HornResp.
Hi Don, may I ask where you found these Thiele-Small parameters from the 3015LF?
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Old 28th March 2011, 12:19 AM   #16
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Interesting box bjorno!

Couple of questions: Does this need a high pass like a tapped horn and could one fit the driver the other way around (again a la TH) for ease of access if one reverses polarity?

Thanks!
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Old 28th March 2011, 12:21 AM   #17
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Bjorno - no need for access panel, I simmed it in CAD and it went in with an inch to spare.

Djim - Eminence has brought out a new version of the 3015LF but I'm still using the old version numbers.
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Old 28th March 2011, 12:46 AM   #18
Djim is offline Djim  Netherlands
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Justin, I think you should check your 3015LF's first because the 'new' version seems to be quiet different.

Last edited by Djim; 28th March 2011 at 12:48 AM.
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Old 28th March 2011, 12:58 AM   #19
Djim is offline Djim  Netherlands
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The difference in Don's design:
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Old 28th March 2011, 01:50 AM   #20
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by Don Snyder View Post
Bjorno - no need for access panel, I simmed it in CAD and it went in with an inch to spare...
Hi Charles,Don:

You don't need any HP-filter at all if you stay below~63W input( i.e. ~ 116 SPL and 1 Hz safe).
Mount the driver like a TH or a T_TQWT: The performance differences will IME be benign, but mounting like an TH has an advantage when stuffing is used as it's easier to minimize the minimum required stuffing for smoothest response (sometimes needed (Hi-Fi)) and if used, would be easier to evenly distribute the damping material at the 'throat side' whereas otherwise would be occupied of the basket and magnet volume.

Thanks again Don !: I oversaw the possibility to avoid using a lid, I'm too focused on T-TQWT designs where an access lid is an evil necessity to incorporate.

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