Can BR boxes be converted to TL?

mikan · 30th April 2006, 01:33 PM

This is probably a stupid question, but I'm new

I want to build a pair of speakers for music use without a sub, generally at low SPL. A design with high sensitivity and an f3 around 30Hz would therefore suit, so an MTM transmission line enclosure is what I plan on building.

The Thor variants interest me because "optimised" enclosures were developed for the Seas drivers using the Thor crossover without modification, despite the optimised MLTL enclosures being very different in configuration to the original Thor.

However much I'd love to build a Thor variant, I can't justify the expense of the Seas drivers for my first project. I'm very interested in the designing my own enclosure (using MJK's MathCad worksheets), but don't want to get in to crossover design at this stage.

Given that I can't find any cheaper, reputable MTM transmission line designs to base my project on, my question is can I use the crossover and drivers from a BR enclosure for a transmission line enclosure if I keep the baffle width the same?

Cheers

Scottmoose · 30th April 2006, 01:51 PM

No question is stupid if you don't know the answer to it.

Yes, is the answer, of course you can. Just keep the front baffle the same width as the original so you don't mess up any baffle-step compensation built into the crossover, as you note. Did you have anything in particular in mind?

Best
Scott

mikan · 1st May 2006, 08:48 AM

Quote:

Originally posted by Scottmoose
Yes, is the answer, of course you can. Just keep the front baffle the same width as the original so you don't mess up any baffle-step compensation built into the crossover, as you note. Did you have anything in particular in mind?

Thanks for the reply, Scott, that's what I wanted to hear. Must the front baffle internal width be maintained too?

I'm considering using either Dayton RS180s or Vifa XG18s - what drivers would you recommend for TL use in that price range (~USD30-60)? I don't have any particular crossovers for either in mind yet.

Cheers

Scottmoose · 4th May 2006, 02:56 PM

Sorry for the late reply -I got a bit sidetracked. Of the two, the Daytons would be my first choice in value for money terms. Alternatively, you might want to think about a 2 way using a single 10in driver with a tweeter, which will have much more LF heft due to the greater cone area, if you can stretch to it.

Best
Scott

sreten · 4th May 2006, 03:32 PM

http://www.zaphaudio.com/audio-speaker16.html

Is a perfect place to start,

/sreten.

mikan · 8th May 2006, 10:36 AM

Thanks for the replies Scott and sreten. The TL project is on hold until I've done some reading.

I've since decided on what to build - Zaph's Waveguide TMM design. Has anyone heard this speaker or have any comments on it?

sreten · 8th May 2006, 11:36 AM

Hi,

the CA18RNX may be more difficult to TL effectively, due to lower Qts.

/sreten.

mikan · 9th May 2006, 10:58 AM

Quote:

Originally posted by sreten
Hi,

the CA18RNX may be more difficult to TL effectively, due to lower Qts.

/sreten.

That's true, but I'll be building the Waveguide TMM pretty much as-is, only changing a few cabinet construction details. The Thor variant project will be next

30th April 2006, 01:33 PM	#1
mikan diyAudio Member Join Date: Apr 2006 Location: bendigo.vic.au	Can BR boxes be converted to TL? This is probably a stupid question, but I'm new I want to build a pair of speakers for music use without a sub, generally at low SPL. A design with high sensitivity and an f3 around 30Hz would therefore suit, so an MTM transmission line enclosure is what I plan on building. The Thor variants interest me because "optimised" enclosures were developed for the Seas drivers using the Thor crossover without modification, despite the optimised MLTL enclosures being very different in configuration to the original Thor. However much I'd love to build a Thor variant, I can't justify the expense of the Seas drivers for my first project. I'm very interested in the designing my own enclosure (using MJK's MathCad worksheets), but don't want to get in to crossover design at this stage. Given that I can't find any cheaper, reputable MTM transmission line designs to base my project on, my question is can I use the crossover and drivers from a BR enclosure for a transmission line enclosure if I keep the baffle width the same? Cheers

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30th April 2006, 01:51 PM	#2
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	No question is stupid if you don't know the answer to it. Yes, is the answer, of course you can. Just keep the front baffle the same width as the original so you don't mess up any baffle-step compensation built into the crossover, as you note. Did you have anything in particular in mind? Best Scott

4th May 2006, 02:56 PM	#4
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	Sorry for the late reply -I got a bit sidetracked. Of the two, the Daytons would be my first choice in value for money terms. Alternatively, you might want to think about a 2 way using a single 10in driver with a tweeter, which will have much more LF heft due to the greater cone area, if you can stretch to it. Best Scott

4th May 2006, 03:32 PM	#5
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	http://www.zaphaudio.com/audio-speaker16.html Is a perfect place to start, /sreten.

8th May 2006, 10:36 AM	#6
mikan diyAudio Member Join Date: Apr 2006 Location: bendigo.vic.au	Thanks for the replies Scott and sreten. The TL project is on hold until I've done some reading. I've since decided on what to build - Zaph's Waveguide TMM design. Has anyone heard this speaker or have any comments on it?

8th May 2006, 11:36 AM	#7
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, the CA18RNX may be more difficult to TL effectively, due to lower Qts. /sreten.

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