3015lf TH @ 35-40hz but only 20" deep help - diyAudio
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Old 26th March 2011, 05:03 PM   #1
justint is offline justint  United States
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Default 3015lf TH @ 35-40hz but only 20" deep help

I am starting to work on this years boat project a 28foot pontoon.. I have bought 2 - 3015lf for subs and I want to put them under the seats so I have 18" wide I can go, 20" deep and however high I need as technically I will be laying the boxes on there sides.. Anyone have a link for a box build or any ideas.. looking for loud and low with good efficancy as I am running off a generator. Thanks for all the help!! Pictures of the beautiful 1985 pontoon boat to come. this is going to be a total transformation for this beauty.
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Old 26th March 2011, 06:22 PM   #2
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You would probably end up with a "thinner" version of what Don Snyder built, I'd suggest searching his posts.

The size restrictions you have may make a bass reflex cabinet a better choice, as a "thinner" TH will end up with less gain and may have more peaky frequency response problems.
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File Type: jpg Don Snyders 3015LF TH.jpg (27.1 KB, 1431 views)

Last edited by weltersys; 26th March 2011 at 06:26 PM.
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Old 26th March 2011, 09:38 PM   #3
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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.
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File Type: txt don.txt (423 Bytes, 119 views)
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Old 27th March 2011, 01:08 AM   #4
justint is offline justint  United States
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thanks Don, to be honest I am horrible at Hornresp .. but I guess really all I need to know is how much space between the front of the driver board and the top of the box and then how big should I make the opening? the rest I can figure out as I have made about 5 TH's now
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Old 27th March 2011, 12:58 PM   #5
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by justint View Post
..I have bought 2 - 3015lf for subs and I want to put them under the seats..
Hi,

IMO, A T-TQWP concerning your application is smaller and simpler to build and would outperform the TH in post #3.

Compare the performance here:

b
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File Type: jpg Don-versus-b-HOLM.JPG (765.3 KB, 1381 views)
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File Type: txt b.txt (450 Bytes, 40 views)
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Old 27th March 2011, 02:47 PM   #6
justint is offline justint  United States
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bjorno, thanks for the research.. I am not at all familiar with what a T-TQWP is ? can you post me a picture and if possible some dimensions for this box ? that would be a huge help.. thanks again for the input..
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Old 27th March 2011, 05:09 PM   #7
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Here it is ... 17.5 x 19.5 x 43" & made from 18mm or 3/4 inch plywood. The
mouth opening and the turn-around are both 8.25"
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File Type: gif Bjorno.gif (4.8 KB, 1232 views)
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Old 27th March 2011, 05:10 PM   #8
justint is offline justint  United States
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thanks don that looks pretty easy!! you guys are the best.. any input on bjorno's box idea?? I have never seen or built one of those.
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Old 27th March 2011, 05:44 PM   #9
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Quote:
Originally Posted by justint View Post
thanks don that looks pretty easy!! you guys are the best.. any input on bjorno's box idea?? I have never seen or built one of those.
This IS Bjorno's box. Smaller & easier to build than my TH. Bjorno did a GREAT job simming this box!
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Old 27th March 2011, 06:15 PM   #10
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by Don Snyder View Post
This IS Bjorno's box. Smaller & easier to build than my TH. Bjorno did a GREAT job simming this box!
Hi Don,Justint,

Thank you Don...

Justint,

Maybe the design I proposed and named: T-TQWP is a name misnomer and should better be a T-QWP(Tapped Quarter-wave -Pipe).
A T-TQWP (Tapped-Tapered-Quarter-wave-Pipe) or a T-QWP are both folded like a TH's but only the T-QWP uses a constant CSA(Cross Sectional Area).

My superfluous !!? version:A simple picture showing the T-TQWP:

b
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File Type: jpg Eminence3015LF_185Liter-210cm_T-QWP.JPG (154.4 KB, 1246 views)
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