Mach 5 UXL-18 LLT modelling. - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 29 Old 09-24-11, 02:44 AM Thread Starter
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re: Mach 5 UXL-18 LLT modelling.

Cool, thank you. I'm not really particular about dimensions. Whatever is best for the driver is fine with me.
It does look like 13 cubes gets the port resonance up closer to the desired level without pushing velocity too high.
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post #12 of 29 Old 09-24-11, 02:48 AM
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re: Mach 5 UXL-18 LLT modelling.

I can modify one off the designs I already have to adjust the port and size if need be.

PM me your email and I will send you some pics/info.

cheers

Graham
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post #13 of 29 Old 09-24-11, 05:45 AM Thread Starter
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re: Mach 5 UXL-18 LLT modelling.

Okay folks, I'm going to have Graham do a custom design for this one, and I'd like your opinions.
What cabinet size/specs (within the realm of possibility, of course) would you like to see?
My goal here is to arrive at a design that most people can live with, so other folks can save a few bucks on a pre-made design.

Here's where we're at right now:
The enclosue volume will fall somewhere between 10-15 cu ft.
Depending on the enclosure volume, it'll be tuned to 12-15Hz (bigger box = lower tune).

Which direction would you go with it?

Last edited by mr2dave; 09-25-11 at 12:44 AM. Reason: Added preliminary specs.
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post #14 of 29 Old 09-25-11, 05:57 AM
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re: Mach 5 UXL-18 LLT modelling.

I would go with 12 cu.ft. tuned to 15 hz with a 2.5" x 20" x 44" long port. First port resonance is 154 hz.
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post #15 of 29 Old 09-25-11, 07:04 AM
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re: Mach 5 UXL-18 LLT modelling.

Quote:
mr2dave wrote: View Post
Okay folks, I'm going to have Graham do a custom design for this one, and I'd like your opinions.
What cabinet size/specs (within the realm of possibility, of course) would you like to see?
My goal here is to arrive at a design that most people can live with, so other folks can save a few bucks on a pre-made design.

Here's where we're at right now:
The enclosue volume will fall somewhere between 10-15 cu ft.
Depending on the enclosure volume, it'll be tuned to 12-15Hz (bigger box = lower tune).

Which direction would you go with it?
I started work on a data base with the aim of producing models for all drivers that would suit most people so people could go there for basic model ideas. There didnt seem to be demand so I stopped work on it though.

If you go with Mikes dimensions though, its a straight forward build. Not sure how well 12 cu ft would sit with most people though, and you may be best designing this to best suit your requirements.
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post #16 of 29 Old 09-25-11, 08:01 AM Thread Starter
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re: Mach 5 UXL-18 LLT modelling.

Thanks for the help, Mike P. That sounds like it might just be the sweet spot.

Thanks for the advice, Moonfly.
It'll be a super-easy build for me no matter what, since I'll have Graham's plans. =D
Anything in the ranges mentioned will meet my requirements, I'm not too picky.
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post #17 of 29 Old 09-25-11, 08:48 AM
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re: Mach 5 UXL-18 LLT modelling.

Whether you go for 11 or 12 cubes you will have a great sub. I designed a 10 cu ft mach audio sub for Gregg and he has built 4 off them!!!!!! Now that's commitment. Just let me know what you want me to do and I will get under way.
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post #18 of 29 Old 09-25-11, 10:07 AM Thread Starter
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re: Mach 5 UXL-18 LLT modelling.

Of that, I have NO doubts, Graham. You've been very helpful so far, explaining your reasoning so that I can understand things that I just plain didn't know, such as the relationship between port resonance and crossover freqs.
I'll make a call relatively soon, but I'm in no hurry. It'll be a while before anybody has a driver on-hand, anyhow.

Do you have anything to add to Mike's wisdom?
I'm still not super-clear on what is gained or lost as enclosure size changes. I understand sealed enclosures, and I think I understand that a ported enclosure works pretty much the same way until a certain lower frequency limit, depending on the tune.
When I model it in WinISD, and I see the low-end SPL increase with enclosure size, along with excursion, while the top-end loses just a little. It looks like the port can be tuned as-needed to tame velocity, within cabinet size limits for a particular driver.
So, if I go too big and/or push too much power, I'll exceed excursion limits if I don't add a filter, which comes with it's own issues.
Am I more or less getting it? Yeah, I'm that much of a noob at this, for now =/
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post #19 of 29 Old 09-25-11, 11:08 AM
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re: Mach 5 UXL-18 LLT modelling.

Dave,

I will email you in tomorrow with what I think.

Mike is a great guy and I did tell you he would suggest 11-12 cu ft so you will have a really great sub/s.

cheers

Graham
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post #20 of 29 Old 09-25-11, 11:31 AM Thread Starter
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re: Mach 5 UXL-18 LLT modelling.

Cool stuff, Graham.

All I want to know from anybody/everybody is; How would you build it for yourself?

I do understand that there are a lot of variables involved, but I assume that a pattern should emerge from the answers to that question. Indeed, that had already started to happen.
The fact that I'm learning a lot about sub design along the way is just gravy. =)
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