I've been pondering whether the folding scheme on the TQWT's (is that lingo going to catch on, or will everyone keep using TL?) I'm building will reduce the reflections that get back to the driver. These guys claim to have it figured out, and they've made some darn pretty bends. I do get the "human form" look. It also sounds as if they are using BSC, which isn't always the case with commercial single driver offerings. Do you suppose those are layered? Seems like it would be tough to make those tight radius bends.
Paul
Wild Burro Audio Labs - DIY Full Range Speakers
edit: forgot the link on the first go!
Paul
Wild Burro Audio Labs - DIY Full Range Speakers
edit: forgot the link on the first go!
I meant if one were trying to bend a flat sheet around that radius. I certainly understand that you could layer such a shape.
Paul
Wild Burro Audio Labs - DIY Full Range Speakers
Paul
Wild Burro Audio Labs - DIY Full Range Speakers
I think it would depend on the material thickness and the initial bend radius. You'd have to start with thin material to get the desired shape, and then build up several layers. I'm sure I've seen this approach somewhere.
Jeff
Jeff
Do they want to avoid " interchannel crosstalk" between sections of the pipe?
Seen that way , every section seems free to resonate (or do not!) ,letting acoustic energy "migrate" freely to the mouth.
As I see , those are multiple layer CNCed, not curved sheets.
Seen that way , every section seems free to resonate (or do not!) ,letting acoustic energy "migrate" freely to the mouth.
As I see , those are multiple layer CNCed, not curved sheets.
Kerfing would allow those bends easily.
There is also a type of plywood which I know as "Bendy" plywood which is extremely flexible although I would probably just cut the kerfs.
CNC machines (routers really) can cut just about any shape and size, wastes a lot of material though and like a lot of "progress" nowadays, the art, technique and craftsmanship is lost .
There is also a type of plywood which I know as "Bendy" plywood which is extremely flexible although I would probably just cut the kerfs.
CNC machines (routers really) can cut just about any shape and size, wastes a lot of material though and like a lot of "progress" nowadays, the art, technique and craftsmanship is lost .
Used in its broadest sense (an atypical use), a TQWT could be any of the genre we typically call TLs, Voigt Pipes, Horns, and Metronomes... i use the term TL in its broadest sense to mean the same thing.
I think we will continue to see TL used for boxes with openEnd xSection =< closedEnd with the strictest definition being that it is damped to almost aperiodic, TQWT for boxes with openEnd xSection > closedEnd with a linear taper (ie TQWT=TQWP=Voigt). In its broadest sense this is also a horn but a horn is usually openEnd xSection > closedEnd with an expansion which cannot be defined with a straight line.
The commercial thing you pointed to is a TL. I would never call that a TQWT.
On top of that you can mass load them, and or add an air-cavity. The traditional Bailey/Radford/IMF TL has both, is end loaded, and is not stuffed enuff to fit the strictest definition of a TL.
dave
I have been following the logic that a recall GM proposing: that there is no electrical analogy to a tapered line, and since TL is a borrowed word, it makes sense to use TQWT for any line that is tapered (in either direction). I could be mistaken, or misrepresenting his idea, but it makes sense to me. I do suspect the term Transmission Line is here to stay. Seems I recently saw some manufacturer referring to it as a "reverse horn." That was a new one on me.
Paul
Wild Burro Audio Labs - DIY Full Range Speakers
Paul
Wild Burro Audio Labs - DIY Full Range Speakers
That is what i meant in the broadest sense.
GM started using the term reverse taper TQWT... i' personally going to stick with the traditional use of the terms -- i have avoided the use of TQWT for sometime, prefering Voigt Pipe.
dave
GM started using the term reverse taper TQWT... i' personally going to stick with the traditional use of the terms -- i have avoided the use of TQWT for sometime, prefering Voigt Pipe.
dave
that's certainly how it reads to me as well -
very time consuming and low material yield with this method
I think that those guys pass the day drinking vodka , while the machines do the job . And the wood powder at the end of the day will be pressed and mixed with glue again for the very next day.
well who wouldn't mind spending the best part of a weekend drinking vodka? but I certainly wouldn't suggest being around any woodworking equipment while/after doing so
as for recycling routing waste from BB plywood, it would tend to be more chips and splinters than the powder you'd get from MDF,
oh, you were making a joke... 🙄
Somewhat O.T but a friend sent me a link to a 5 axis gantry cnc machine doing a full sized automobile out of foam for what I believed to be for preliminary wind tunnel testing some months ago. IIRC it was out of Germany and was quite long perhaps 10 minutes or more of video (no idea how long the actual event took) and absolutely fascinating to watch.
If I ever find it I will link it here, I admit the foam model was produced much quicker than a clay model😀
Back on topic now.
If I ever find it I will link it here, I admit the foam model was produced much quicker than a clay model😀
Back on topic now.
No need to wonder ... 100 Km from where I live students of University projected and implanted a robotic hand to a swedese young man , with 10 sensors placed at the (dead) terminals of the forearm , and it worked . As seen today on local tv news .
From the driver size, the enclosure appears to be made of 9 x laminated sheets, each 18 mm or thereabouts.
The spare bits could probably go to make Bonsai sculptures or jigsaws ...
Not cheap at nearly £4k. I wish the designer well but will it really sound that much better than one of GM's MLTL designs? On the other hand, as sculpture you can listen to, it's probably a bargain.
The spare bits could probably go to make Bonsai sculptures or jigsaws ...
Not cheap at nearly £4k. I wish the designer well but will it really sound that much better than one of GM's MLTL designs? On the other hand, as sculpture you can listen to, it's probably a bargain.
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