Good Morning,
I am brand new to speaker building (so type slowly). All of you are way beyond my ability so laymans terms would be appreciated. My first build is the old TriTrix TL. I have cut my own cabinet per the drawings and few things on Mr. Campbells site. I am trying to figure out how energy travels down the transmission line. I have read it rides on air as a wave, others sites say it moves air. I as a woodworker have the ability to change the 2 corner waveguides that are flat and direct sound like light using 2 mirrors at 45°. I am trying to figure out if rounding them will be beneficial but there are a lot of caveats possible. Should I just leave it alone or is there enough theory of how the energy travels that it will be beneficial? The 2 corner waveguides would be doubled in thickness to achive this and that would change the size of the small chamber it creates (if this chamber is actually active). Do waveguides reflect energy, as in right angles, or does energy travel down them using their sides like RF?
Thanks for any ideas
Donny
.
I am brand new to speaker building (so type slowly). All of you are way beyond my ability so laymans terms would be appreciated. My first build is the old TriTrix TL. I have cut my own cabinet per the drawings and few things on Mr. Campbells site. I am trying to figure out how energy travels down the transmission line. I have read it rides on air as a wave, others sites say it moves air. I as a woodworker have the ability to change the 2 corner waveguides that are flat and direct sound like light using 2 mirrors at 45°. I am trying to figure out if rounding them will be beneficial but there are a lot of caveats possible. Should I just leave it alone or is there enough theory of how the energy travels that it will be beneficial? The 2 corner waveguides would be doubled in thickness to achive this and that would change the size of the small chamber it creates (if this chamber is actually active). Do waveguides reflect energy, as in right angles, or does energy travel down them using their sides like RF?
Thanks for any ideas
Donny
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Well, we can discuss the operating physics of a quarter-wave box easily enough, but I assume your main priority right now is simply whether it's beneficial to round over the strike plates. The short answer is that for this design, no. Like all bass enclosures, the TritrixTL box is only designed to operate at low frequencies -you don't actually want to extend the upper bandwidth limit or group delay will potentially become excessive in the upper bass / lower midrange (the audibility of GD drops approximately with our hearing acuity as frequency decreases). Smooth curves are advantageous to short[er] wavelengths as you are likely to have fewer losses, but except in extreme cases have little practical effect on the longer bass frequencies. In other words, most of the time they are actually disadvantageous for bass enclosures, since all you are doing is promoting efficiency at the top end of its range where you least want it.
In practice, much of this will probably be a moot point as the internal damping will kill most of the unwanted higher frequencies. However, efficient design is generally about 'achieving most with the least', so no point in giving what you don't want any more of a helping hand than it actually needs. 😉
In practice, much of this will probably be a moot point as the internal damping will kill most of the unwanted higher frequencies. However, efficient design is generally about 'achieving most with the least', so no point in giving what you don't want any more of a helping hand than it actually needs. 😉
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Thank you very much. I was reading about the THOR developement and it with Joseph D'Appolito and it was obvious these plates were not of random shape. Although I admit to not knowing (understanding) why see now it everything in the box is on purpose (I think).
Thanks for the help, Do you think the little hollow corners created by those to 45° plates have any effect on sound ? Thanks again.
Donny
Thanks for the help, Do you think the little hollow corners created by those to 45° plates have any effect on sound ? Thanks again.
Donny
The only real purpose / value of the strike plates is to roughly maintain the cross section around the 180 degree bend (whether that actually brings any audible or measurable benefits relative to omitting them entirely rather depends on the details of individual design. Since they're included and the Tritrix is a well-proven box, I'd keep them). The voids should ideally be filled with something suitable, e.g. dried antibacterial cat-litter or silver-sand, expanding plumbing foam etc. to avoid having a potential cavity resonance, which is certainly not part of the design intent.
Sound is a perceptual interpretation of the movement of air. Moving that air takes energy. Sound is the result of air, moved by energy, transferring its energy to our eardrums.
Energy does not ride air, as such; energy does not disappear or come to live either. You convert between types. 🙂
The sound coming from the TL is not riding on top of the moving air. It is the moving air.
Energy does not ride air, as such; energy does not disappear or come to live either. You convert between types. 🙂
The sound coming from the TL is not riding on top of the moving air. It is the moving air.
It can work either way, depending on how you use them. However in this case wavelengths are going to be significant compared to the size of the entire box, that is the nature of this type and the stuffing keeps it this way.
If you want to go deep into Thot, Clarity on Seas Thor Kit
Thor is an instance that shows that even the most talented, experienced, and knowledgeabe can make stupid decisions sometimes. Joe incorrectly assummed he could toss out a significan tamount of volume, but then made a serious measuring mistake that suggested that that decision was fine — he really only tested 1 woofer in the line, so to get the measurements he got with 2 you have to double the box volume.
Leave the deflectors out. They can add a tiny bit of bracing, but in general the gain in low pass filtration means you have less ripple in the response at lower frequencies. Any output from the terminus above the fundemental will cause ripple, and the higher in frequency it is the easier it is to detect.
dave
Wouldn't leaving out the corners cause some kind of refection back upward toward the speakers ?? I would like to know where to read/see so I can understand more even though it is probably a long long process.
Here's my 2 cents worth. If I were designing this specific TL, I would not use those deflectors but I would model the design without them to get the correct predicted outcome. Corner deflectors, rather straight or rounded, were thought to help "steer" the sound waves more smoothly around the corners, but as others have said, the stuffing in the line absorbs the higher frequencies and the wavelengths of the lower frequencies are too long to even "see" the reflectors, plus some line volume is lost. The key here though for the TriTrix TL is that's the way it was designed and tested, so I'd leave them in.
Paul
Paul