3015lf TH @ 35-40hz but only 20" deep help - Page 3 - diyAudio
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Old 28th March 2011, 02:53 PM   #21
tb46 is offline tb46  United States
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Hi Y'all,

Bjorno's design lists L12 as 15.50, for a 15"nom. driver this would have to be larger. Changing the dimensions to e.g.: 20cm doesn't seem to make much of a difference. Just thought I point it out.

Regards,
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Old 28th March 2011, 04:52 PM   #22
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by tb46 View Post
Hi Y'all,

Bjorno's design lists L12 as 15.50, for a 15"nom. driver this would have to be larger. Changing the dimensions to e.g.: 20cm doesn't seem to make much of a difference. Just thought I point it out.

Regards,
Thanks Oliver,19.5 cm is the very minimum to use...

b
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Old 28th March 2011, 07:06 PM   #23
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Here's the layout. Take the sawdust out of the 16" dimensions (make them all 15.87" or even 15.75").
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File Type: gif Bjorno.gif (4.1 KB, 931 views)
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Last edited by Don Snyder; 28th March 2011 at 07:10 PM.
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Old 15th April 2011, 11:26 PM   #24
justint is offline justint  United States
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Box turned out great. so did the #'s ...1.5 hrs for an easy build
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Old 16th April 2011, 08:56 PM   #25
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Great job Justint - What did you power it with to get the 130dB. How does it sound? Does it go below 35Hz?

I'm planning to build 2 as soon as I get the drivers. PE has jacked up the price to $300 each so I went to Musicians Friend. The speculation I've heard
is the Chinese have jacked up the price on rare earth metals (Neodymium)?
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Last edited by Don Snyder; 16th April 2011 at 09:11 PM.
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Old 17th April 2011, 01:24 AM   #26
justint is offline justint  United States
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Used an adcom gfa555 II bridged... couldn't play all day at that level but that was a 63h test tone from 1M away.. I love this box.. gonna build a couple more.. super easy and super fun.. and yes it still does over 120db at 35hz..
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Old 18th April 2011, 05:40 PM   #27
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Nice good job!
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Old 22nd April 2011, 09:07 PM   #28
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Looks as though the test was done indoors. Do you have anywhere to test outdoors, to get a closer comparison to the SS15?
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Old 8th November 2011, 11:13 PM   #29
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Originally Posted by bjorno View Post
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
You should throw away the hyphen; it looks ungainly.

The king is dead. Long live the TQWP!

Without the effect of the taper, the boost is limited to 6dB above infinite baffle sensitivity, no?
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Old 8th November 2011, 11:31 PM   #30
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by 454Casull View Post
You should throw away the hyphen; it looks ungainly.

The king is dead. Long live the TQWP!

Without the effect of the taper, the boost is limited to 6dB above infinite baffle sensitivity, no?
Hi,

Don't know if that's a good idea.
We have T-TQWT: Tapped-Tapered Quarter-wave -Tube and then if a straight pipe: T-QWP= Tapped Quarter-wave-Pipe.

Both types have an access lid: if dismantled they would turn into a TQWT and a QWP ...= all in order.

6 dB seems to be about right..theoretically..

b
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