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Old 12-21-07, 11:33 AM   #1
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Transmission Line Subwoofer


Hi Guys,

I'm kind of new to the DIY speaker scene, I've built "The Golden Boys" from PE, and 5 Bargain aluminum MTM's 3 of whish are currently the front speakers for my soon to be 5.1 HT, they produce decent bass already, but I'm ready to build a sub for my 10' by 12' room. I already have a Dayton SD215-88 8" Shielded DVC Subwoofer part number 295-480 and a Dayton SA70 70W Subwoofer Amplifier part number 300-784. After looking around the internet I got interested in the transmission line idea. Will this work well with these products? I wouldn't have to use the sub for music if that makes a difference, I'm mainly interested in gaining dramatic LFE for dvd's. please help! Any comments or suggestions are appriciated!!


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Old 12-21-07, 11:41 AM   #2
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Re: Transmission Line Subwoofer


I tried making a transmission line sub with that same amp and driver. It worked but my results were less than spectacular. I don't know what went wrong - the driver had the right parameters and it modeled well. It is possible I didn't have enough patience to work with the design.

You can have the enclosure to play with if you want.


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Old 12-21-07, 12:19 PM   #3
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Re: Transmission Line Subwoofer


Did you try closing the termus up some by adding MDF to each side? From what I've read this "loading" might help the response, also did you stuff this pipe or not? Thanks for the reply I'm interested to hear what you tried


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Old 12-21-07, 12:55 PM   #4
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Re: Transmission Line Subwoofer


Would anyone be able to give me the best dimensions for this transmission line? What adjustments should I make to Boom's design? Thanks for the help


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Old 12-21-07, 01:00 PM   #5
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Re: Transmission Line Subwoofer


No I did not add MDF to the sides. I'm not really sure what you mean by that anyway. Yes I did stuff the inside. I probably could have experimented more with the stuffing but I lost heart and didn't. I still don't know why the extension was 10 Hz less then modeled. So I took the sub apart and moved on to other things.

It is a shame. I love how transmission lines sound. My omni-speakers I made and my old HTD level 3's are tranmission lines and my TABAQs I made (but not designed) are mass loaded transmission lines. I just couldn't get a TL sub to work. Someday (in another house) I may make a big straight pipe one - we'll see.


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Old 12-21-07, 01:13 PM   #6
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Re: Transmission Line Subwoofer


Maybe I'm being too picky. Here is the modeled graph (red) vs. my measurements (purple). There is a chance I was just taking bad measurments (my room is far from optimal for sub frequencies). To tell the truth I had a lot of projects going on then which could also be why I got distracted. You know, why focus on a 70 watt 8" sub when I was making a 2000 watt 15" one for a friend? Maybe I'll put this back together and play with it a bit.

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Old 12-21-07, 01:35 PM   #7
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Re: Transmission Line Subwoofer


No I did not add MDF to the sides. I'm not really sure what you mean by that anyway.

I simply meant to make the opening smaller because from what I've read if you make the opening smaller it will make the TL seem longer. I don't know if that makes a big difference. Again, I'm a newby to subs and TL's, so I've been trying to learn as much as possible about both at once.


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Old 12-21-07, 02:13 PM   #8
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Re: Transmission Line Subwoofer


Quote:
spresser wrote: View Post
No I did not add MDF to the sides. I'm not really sure what you mean by that anyway.

I simply meant to make the opening smaller because from what I've read if you make the opening smaller it will make the TL seem longer. I don't know if that makes a big difference. Again, I'm a newby to subs and TL's, so I've been trying to learn as much as possible about both at once.
Ah. I could give that a try. As you can see from the pics I took of it, the TL itself is tapered which does reduce the length needed.

My original plan was to make the whole thing from 8" PVC pipe. That lasted until I found out how expensive 8" pipe is.

I guess one thing I noticed is that since TL subs need to be so long, you might as well use large drivers as they won't make the final design that much bigger. If I were to do it again I'd probably use something bigger than an 8". Also, because it is hard to get a really low tune in a small package, I'd take a look at some pro-sound woofers.


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Old 12-21-07, 10:26 PM   #9
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Re: Transmission Line Subwoofer


Yeah It looks preety good and from that thread it sounds like it worked preety well, what would you suggest I do different if I make a similar setup? I think I'm gonna try to start working on it sometime after new years so anything you think I should try to improve it is appreciated, I could make a simple sealed box, but that seems so boring, I'm ready to branch out and try something different.


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Old 12-21-07, 11:33 PM   #10
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Re: Transmission Line Subwoofer


Suggestions? Make a box with access panels. I can't get to the tight fiddly part of the TL because I glued the whole thing shut.


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