I've tried reducing the damping and it doesn't feel like a problem.
I always try to reduce damping because it can have a negative effect.
Do you have any other tips?
Bigger or smaller box?
Higher or lower box with the same volume?
Placement of driver and bass reflex tube?
Do you have any rules when making an MLTL construction?
SD x X?=area
I always try to reduce damping because it can have a negative effect.
Do you have any other tips?
Bigger or smaller box?
Higher or lower box with the same volume?
Placement of driver and bass reflex tube?
Do you have any rules when making an MLTL construction?
SD x X?=area
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Here is a smaller MLTL (Bluebuck) from the MarkAudio site. I don't know who designed this speaker.
It has a weaker base.
It has a weaker base.
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Compact ML horn, from Mark Audio site. Maybe same designer as Bluebuck.
https://www.markaudio.com/wp-content/uploads/2022/11/CHP90-compact-ML-horn.png
https://www.markaudio.com/wp-content/uploads/2022/11/CHP90-compact-ML-horn.png
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Yes, it is close to his construction. You can see that it is similar to the one with roughly the same results.
It is really possible to make many different boxes for that driver. Seems like you have a lot of boxes to choose from.
It's hard to say what they sound like. You have to try your hand otherwise.
It is really possible to make many different boxes for that driver. Seems like you have a lot of boxes to choose from.
It's hard to say what they sound like. You have to try your hand otherwise.
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Scott’s formal relationship with MA is fluid.
Scott is so prolific i can not keep up redrawing his sketches. At least now he has a good library of drawings to pinch. Many of these will not be to scale.
dave
Scott is so prolific i can not keep up redrawing his sketches. At least now he has a good library of drawings to pinch. Many of these will not be to scale.
dave
Some copy/pasted info I've posted over the years in one form or another:
Margolis-Small's HP 67/97 & 41C calculator program if wanting all the math for vented, sealed: http://www.aes.org/e-lib/browse.cfm?elib=3902
T/S max flat:
net volume (Vb) (L) = 20*Vas*Qts'^3.3
box tuning (Fb) (Hz) = 0.42*Fs*Qts'^-0.96
Find its net Vb, then its i.d. area (CSA); driver vertical location + offset + bottom plate thickness sets i.d. height
The vent/horn terminus opening causes a downward shift, hence the distances are further down than a closed box's 1/5, 1/3rd, etc., but both the driver and vent should be at a vented pipe's odd harmonics. You can figure it out using Hornresp's
'path' slider in 'chamber' or just use these as proven audibly 'close enough':
Z = (L)x ~ 0 (top), 0.217, 0.349, 0.424, 0.561
Of course the first one doesn't apply to any ~zero area [CSA] terminated pipe/horns and if your desired ear seated/whatever driver height doesn't line up close enough to your design, suggest you change the alignment tuning [pipe's length] by adjusting Fs to get it to line up with one of these offsets.
Vent offset only, depending on box HxWxD ratio: Z = (L)x ~0.651, 0.714, 0.848, 0 (bottom)
I only use/recommend ~0.75"/1.8 cm no void plywood or similar, so no need to brace beyond basic vertical, horizontal + driver brace, so just the 'outline' of Dave P10's bracing schemes, but until we reach concrete weight, can't go wrong with his if the extra woodworking isn't a big deal like it always was for me and others with severely limited build timeframes.
Thank you very much.
Watch Scott use these rules. Excellent.
I have done some calculations on the CHP90 and arrived at Vb = 14.18 l and Fb = 53.85.
Yes it is close to what WinISD has calculated.
Even the relationship to the driver and the bass reflex tube placement matches Scott's construction.
One thing I wonder is how to calculate the volume for an MLTL?
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Trying to understand what's going on here with all those apparently complicated things... 🤔
Good that in the end that the 14L liters they seem confirmed, with a 54Hz tuning, right?
Here the situation is that today the courier brought me a pair of MAOP10! and also the TB W5-2143! 😀
The TB they're really heavy and they feel really solid and well constructed! almost the same size of the opening of the CHP-90 so just throw one inside the 14L box and yes! they also sound great with apparently more mid and bass, as I was hoping...
Probably less detailed than the CHP but really nice at my ears! I'll try tell more later when ear them more quietly.
No comment yet about the MAOP10, I've just attached them to the second amp at low volume just to start the burning asap!
Lot of toys now... maybe even too many 😉
Let's see what will come out!!!
Good that in the end that the 14L liters they seem confirmed, with a 54Hz tuning, right?
Here the situation is that today the courier brought me a pair of MAOP10! and also the TB W5-2143! 😀
The TB they're really heavy and they feel really solid and well constructed! almost the same size of the opening of the CHP-90 so just throw one inside the 14L box and yes! they also sound great with apparently more mid and bass, as I was hoping...
Probably less detailed than the CHP but really nice at my ears! I'll try tell more later when ear them more quietly.
No comment yet about the MAOP10, I've just attached them to the second amp at low volume just to start the burning asap!
Lot of toys now... maybe even too many 😉
Let's see what will come out!!!
You're welcome!
??? He's been aware for ages now plus derived some of his own.
Yes, there's numerous variations, just me n' many other T/S early adopters used our then very expensive HP calculators to get quick results.
??? CSA * net length = net Vb.
Nandappe
Thanks for your last upload. Wanting to hear the "sound" of the "Ohashi trio" I searched youtube for their published work. In Greece, as you obviously understand, it is impossible to find a CD. I noticed that the sound from the double bass (
) is "weak" for my taste. So I'm revising my previous reviews about a lack of "lows"
A question . The "gaps" in the sound path (SDDBH-13.5R-AD) are on purpose or for ease of construction ?
Elias
Thanks for your last upload. Wanting to hear the "sound" of the "Ohashi trio" I searched youtube for their published work. In Greece, as you obviously understand, it is impossible to find a CD. I noticed that the sound from the double bass (
A question . The "gaps" in the sound path (SDDBH-13.5R-AD) are on purpose or for ease of construction ?
Elias
Sure! Just need to remember that < optimal = less (mid) bass, more pipe 'ripple' to damp and vice versa and once there's a bit of vent peaking, i.e. technically too big is the real 'sweet spot' IME for good acoustic gain, critically damping the vent, so while I've long since quit doing it for all but the H.E. forums, historically have assumed a 0.707 Qts since this is the modern equivalent of the pioneer's BR/sealed goal.
What is h.e. forum? Never seen it before.
Nice to see Pearl audio. Do you know how he built Sibelius? MLTL?
What I see from the picture it could be one.
After calculations on the dimensions of the box and 32mm thickness, the volume should be approx. 38 litres.
https://s3.us-east-2.amazonaws.com/images.hifiplus.com/zp_tas/media/articles/images/Pearl Acoustics-001.jpg
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High Efficiency forum where 1 watt means something. 😉
Not the same Pearl AFAIK. Right, I assume from the description it's one of 'our' ML Voigt horns, i.e. the 'V' is just means folded in half with a slanted divider board. There's been lots of folks marketing them and MLTLs for decades now without recognition or even bothering to ask.
Not the same Pearl AFAIK. Right, I assume from the description it's one of 'our' ML Voigt horns, i.e. the 'V' is just means folded in half with a slanted divider board. There's been lots of folks marketing them and MLTLs for decades now without recognition or even bothering to ask.
Thanks for the site.
A lot of interesting things to read there. 😉
Ok, it's a Voigt horn. I remember Scott not understanding the utility of the inclined separator in such a design. He wanted an MLTL. It has the same function, he says. If you try the different models in HR with the same volume, you can see that they have similar results.
A lot of interesting things to read there. 😉
Ok, it's a Voigt horn. I remember Scott not understanding the utility of the inclined separator in such a design. He wanted an MLTL. It has the same function, he says. If you try the different models in HR with the same volume, you can see that they have similar results.
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