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Old 18th May 2012, 03:38 PM   #1501
jbell is offline jbell  United States
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same drivers as last time.
The eminence options are: 4015lf, 3015lf, kappa pro 15lf2
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Old 18th May 2012, 04:50 PM   #1502
Djim is offline Djim  Netherlands
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18mm this time, Jim?

Bart, the RCF L15P200AK
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Old 18th May 2012, 05:03 PM   #1503
jbell is offline jbell  United States
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nah... still 5 ply 1/2"... But with the 'broom pole' brace... aka 1/2" dowel front to back.

By the time a metal grill goes on the front, you aren't giving up enough spl to vibration to justify going from 40lbs to 72lbs worth of ply. Especially if you are going to hang a heavy 4015lf in it... the lighter ply is worth it's (lack of) weight. Weight was the primary reason I invoked the 'single sheet' demand on this design in the first place.

Keep in mind (everyone) the SS15 design is not a multi-kilowatt design, and is not meant to tackle the 'big boys.' It's a cheap, lightweight, easy to build, very efficient sub ideal for bar bands, dj's, installs, etc.. The fact that in multiples like flipc uses... it's downright scary... well that's a bonus.

Anyone who wants to armor up... may make the outside case with 3/4" without affecting any of the internals. It kinda goes against the spirit of 'single sheet' but oh well.....
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Old 18th May 2012, 05:06 PM   #1504
AndrewT is offline AndrewT  Scotland
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The 1/2" dowel is probably quite good in compression and thus "braces" against the panels "sucking in" when negative pressure exists inside the box.
What "braces" against positive pressure inside the box? Can the dowel work (provide stiff non extension) in tension relative to the forces and pressures acting?
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Old 18th May 2012, 05:39 PM   #1505
jbell is offline jbell  United States
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brad nailer... cross pin and glue where it goes through panel.
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Old 18th May 2012, 06:05 PM   #1506
Djim is offline Djim  Netherlands
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Lol, there is only one to blame for the limitation set out for this challenge!

Of course everybody should build within his needs or preferences. But for those who are seriously considering an SS15 for high SPL’s, going 12mm (even for internals) is really not enough and braces are needed. However, braces can be reduced to half thickness of the panels without a problem (since forces on both sides of the braces are equal).

Indeed the “broom stick” method is very useful and its function can be improved by putting it in rings that are glued on the (inside) walls. This will enlarge the attachment surface and increases damping of the wall. I know it’s pretty old school, looks cheap, but it really works.
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Old 18th May 2012, 06:29 PM   #1507
jbell is offline jbell  United States
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DJIM:
yea I hear ya.... However any serious design that's all about the max spl should probably never have a single sheet limitation in the first place... should be CNC cut, and use best in class drivers only... and yea, it's my fault that this whole topic of 'single sheet' has taken up over 1500 posts at this point.

However... since it's your fault I was up past 1:00am rejiggering panel dimensions to stay within a single sheet, while increasing real 40hz output AND incorporating the S2-fix you've been working on...

what do you think of this attempt?

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Old 18th May 2012, 07:14 PM   #1508
Djim is offline Djim  Netherlands
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JIM, I am more than happy to receive the blame for your new sleeping habits. To comfort your mind, there is absolutely no compassion from my side what so ever. If your wife complains about your new times, tell her, there is a man far away who feels sorry for her while he enjoys her husband's new frustration. If that isnĺt satisfying enough for your wife, tell her she is more than lucky since her husbands efforts receive only encouraging and promising replies while not so long ago there was a time he would be tarred and feathered and be accused of certain voodoo practices.
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Old 18th May 2012, 07:18 PM   #1509
Mark Kravchenko --- www.kravchenko-audio.com
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I have tar. Anybody with feathers?

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Old 18th May 2012, 07:21 PM   #1510
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Thanks Djim.
Can I read somewhere why the RCF L15P200AK is best suited for the SS15?
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