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-   -   3015lf TH @ 35-40hz but only 20" deep help (http://www.diyaudio.com/forums/subwoofers/185836-3015lf-th-35-40hz-but-only-20-deep-help.html)

justint 26th March 2011 05:03 PM

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.

weltersys 26th March 2011 06:22 PM

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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.

Don Snyder 26th March 2011 09:38 PM

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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.

justint 27th March 2011 01:08 AM

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

bjorno 27th March 2011 12:58 PM

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Quote:

Originally Posted by justint (Post 2517275)
..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 :)

justint 27th March 2011 02:47 PM

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..

Don Snyder 27th March 2011 05:09 PM

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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"

justint 27th March 2011 05:10 PM

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.

Don Snyder 27th March 2011 05:44 PM

Quote:

Originally Posted by justint (Post 2518308)
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!

bjorno 27th March 2011 06:15 PM

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Quote:

Originally Posted by Don Snyder (Post 2518339)
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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