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My first go at a TL design. The driver is a Volt D2500.1 10". The line is 1xSd and 8ft long.
The box on top is not going to be part of this system, thats a seperate project to make some bookshelf speakers with an Audax aerogel and a tweet I've had lying around. Its just being used to provide the top end at the moment.
Eventually the Volt will go into a 3 way active system, just experimenting with box design. I've got its brother in a ported box (the one hiding behind the TL).
I think that it's fairly common to build transmission lines like that. Most designs I have seen have had BOTH the woofer and the port in the bottom, but I don't understand why turning the thing upside down would hurt in any way.
In most TL designs the line starts and ends in the same end of the cabinet. There are, of course, some more complex designs (check this).
In most TL designs the line starts and ends in the same end of the cabinet. There are, of course, some more complex designs (check this).
Riku-78 said:
To me, too... But I'd sure like to hear what those things sound like. After all, TL cabinets are usually a bit larger than that.
I've heard these in a stereo setup and I liked them.
http://www.pmcloudspeaker.com/ib1s.html
Not much help for your ears though
Blackcatsound, if you put the driver at the bottom (turn it upside down) doesn't it help eliminate a 'floor bounce' problem ?
Cheers,
Rob
Why not build some and see (or hear) what they are like? The cabinets are relatively small so material costs are minimal (especially if you look out for scrap materials).
I very much like my TL woofers (used with OB's) and if I was making a small active speaker, would be very tempted to try the TL approach!
I very much like my TL woofers (used with OB's) and if I was making a small active speaker, would be very tempted to try the TL approach!
To tell you the truth, that's the "experimental" part of my active monitor project--trying to build a small TL like theirs. The point is I think their talk about the huge amount of damping R&D is just marketing [grass after being processed by a male cow]. I'm going to try a similar design with just ordinary foam and Acousta Stuf.
I can probably get myself into an anechoic chamber with loads of Brüel & Kjær stuff in spring... I will post some results then. But first I should build the thing.
I can probably get myself into an anechoic chamber with loads of Brüel & Kjær stuff in spring... I will post some results then. But first I should build the thing.
Nuuk said:
Given that this is an 8' line, my guess is it's a *folded* TL. Which means the line exit and the driver can be adjacent and still be at opposite ends - certainly, I believe this is why you see it this way so often.
I also know that you don't always want the driver right at the end of the line. On an 8' line, it might go as much as 2-3 feet from the closed end of the line IIRC. All depends on the driver, etc. So none of this is a given, just an option.
C
The box is purely experimental, it ended up that way as it was easiest to build it like that. MDF is cheap.
The driver is at the top more so I don't kick it by accident
I'm going to build a second box but this time 11ft long (25Hz) to match the drivers Fs. I'm also going to try some different waddings/foams as they are pretty cheap from places like CPC.
The driver is at the top more so I don't kick it by accident
I'm going to build a second box but this time 11ft long (25Hz) to match the drivers Fs. I'm also going to try some different waddings/foams as they are pretty cheap from places like CPC.
Riku-78 said:
Quite a few illustrations of foldings here:
http://www.t-linespeakers.org/design/foldings/index.html
This one would be similar (in concept but potentially more optimum(and much harder to build)) to the one in post #1
An externally hosted image should be here but it was not working when we last tested it.
dave
BlackCatSound said:
As has been clearly shown in the last 5 years or so (since MJK & Augspurger published) the classical TL model is very hit or miss, and usually far from optimum.
15 minutes spent with MJKs tables will produce a line much more optimal.
For more of an editorial read the 2nd part of:
http://www.t-linespeakers.org/readme1st.html
dave
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