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Author Topic: LAB subwoofer plans  (Read 2720 times)

Ari East

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LAB subwoofer plans
« on: August 21, 2020, 11:12:04 pm »

Hey, the lab sub plans are missing from the documentation page (the links are all broken), does anyone have a backup copy? I canít seem to find them anywhere else on the internet either. I am now financially able to commit to making a stack (After years of wanting to), so Iím somewhat frustrated that I canít find the plans.
Thanks in advance to anyone who can help.
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Arjun Bhandari

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Re: LAB subwoofer plans
« Reply #1 on: October 03, 2020, 11:25:14 pm »

Hey, the lab sub plans are missing from the documentation page (the links are all broken), does anyone have a backup copy? I canít seem to find them anywhere else on the internet either. I am now financially able to commit to making a stack (After years of wanting to), so Iím somewhat frustrated that I canít find the plans.
Thanks in advance to anyone who can help.
Bump!
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Art Welter

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Re: LAB subwoofer plans
« Reply #2 on: October 05, 2020, 04:41:58 pm »

Bump!
Arjun,

The LAB horn is difficult  to build, and the performance of the LAB 12 driver is rather limited compared to what is available presently.
Using 18" drivers with more Xmax (excursion) Bl (motor strength)  and power handling allows for 6dB or more output in the same footprint.

If you like FLH (Front Loaded Horn) cabinets, the design below using BC 18SW115 drivers may be a better, as in louder, cleaner and more simple to build choice, the same size (45"x45"x22.5") as the LABhorn.

Only one side is illustrated, the other is symmetrical. Center mouth bracing should be added as shown in red, didn't get the sizes down when originally drawn about 6 years ago.

Art
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Mark Wilkinson

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Re: LAB subwoofer plans
« Reply #3 on: October 05, 2020, 06:06:49 pm »

Bump!

Hi Ari, Arun,
I'm surprised the admin staff hasn't fixed the content link-kinks yet....
but what the heck nowadays ? :)

Anyway, i searched my computer for old design files and struck out...but i have some old hardcopy prints of original plans.
If admins fail to come thru, i'll figure out how to post them.

As you will see in my next post, i still think it's an awesome sub  :)
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Mark Wilkinson

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Re: LAB subwoofer plans
« Reply #4 on: October 05, 2020, 06:14:51 pm »

Arjun,

The LAB horn is difficult  to build, and the performance of the LAB 12 driver is rather limited compared to what is available presently.
Using 18" drivers with more Xmax (excursion) Bl (motor strength)  and power handling allows for 6dB or more output in the same footprint.

If you like FLH (Front Loaded Horn) cabinets, the design below using BC 18SW115 drivers may be a better, as in louder, cleaner and more simple to build choice, the same size (45"x45"x22.5") as the LABhorn.

Only one side is illustrated, the other is symmetrical. Center mouth bracing should be added as shown in red, didn't get the sizes down when originally drawn about 6 years ago.

Art

Hi Art, i oh so agree the labhorn is difficult to build.
But i truly think from comparing the labhorns with other great subs,
that the marriage of a driver specifically mated with a box design, works.
Have yet to find so much output from equivalent size box and wattage in to it.
Labhorns truly rock imo, just keep a low pass on them at 90-95Hz or below, to avoid thermal problems.
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Mark Wilkinson

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Re: LAB subwoofer plans
« Reply #5 on: October 12, 2020, 02:35:01 pm »



Ari, Arjun,   check out this thread https://forums.prosoundweb.com/index.php/topic,172989.0.html

And the Wayback Machine link Marcel posted in it...
a quick look seems like plans are all there...
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Doug Fowler

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Re: LAB subwoofer plans
« Reply #6 on: October 12, 2020, 05:31:54 pm »

Hi Art, i oh so agree the labhorn is difficult to build.

Labhorns truly rock imo, just keep a low pass on them at 90-95Hz or below, to avoid thermal problems.

????
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Seth Udoll

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Re: LAB subwoofer plans
« Reply #7 on: October 12, 2020, 08:44:05 pm »

Hey, the lab sub plans are missing from the documentation page (the links are all broken), does anyone have a backup copy? I canít seem to find them anywhere else on the internet either. I am now financially able to commit to making a stack (After years of wanting to), so Iím somewhat frustrated that I canít find the plans.
Thanks in advance to anyone who can help.
Possible alternative for you, that has even more extension than the LAB Sub and can be built in 2 smaller more portable cabs.

https://billfitzmaurice.info/T60.html

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Art Welter

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Re: LAB subwoofer plans
« Reply #8 on: October 13, 2020, 11:33:57 am »


Ari, Arjun,   check out this thread https://forums.prosoundweb.com/index.php/topic,172989.0.html

And the Wayback Machine link Marcel posted in it...
a quick look seems like plans are all there...
Good find!

I'm posting them here too, sorry about the quality, (can't post the pdf format) but at least they are back on the LAB :^)

Art
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Tim McCulloch

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Re: LAB subwoofer plans
« Reply #9 on: October 13, 2020, 11:57:51 am »

Thanks, Art.  I tried the doc links a few weeks ago, reported to Mods, and found nothing had been done.  Apparently the links have been broken for longer than Covid has been in the USA and for whatever reasons, Ernie is not allowed or able to fix this.
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Ivan Beaver

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Re: LAB subwoofer plans
« Reply #10 on: October 13, 2020, 12:17:00 pm »

Possible alternative for you, that has even more extension than the LAB Sub and can be built in 2 smaller more portable cabs.

https://billfitzmaurice.info/T60.html


I don't know about the particulars of the suggested build, but I have seen a number of graphs on that site (as used for comparisons) be wrong.  So they are not as close as the graph would suggest.

But they might be right.  I don't know
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Mark Wilkinson

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Re: LAB subwoofer plans
« Reply #11 on: October 13, 2020, 01:40:20 pm »

????

Hi Doug,

Labhorns's impedance head south after about 90-95Hz, and don't raise much above minimum from there on.
Attached graph is a single box.

Back when there was a lot of folks building them, i recall reports of folks having coils open. And then subsequent talk about small rear chambers and their contribution to heat build up.

So I figure it makes sense to minimize heat from any content above 100Hz, if possible.


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Caleb Dueck

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Re: LAB subwoofer plans
« Reply #12 on: October 13, 2020, 03:04:05 pm »

The DXF files didn't download correctly, but the PDF's did.  I imported then into AutoCAD LT and scaled them, so if anyone needs a DWG file - let me know. 
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Helge A Bentsen

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Re: LAB subwoofer plans
« Reply #13 on: October 13, 2020, 05:00:48 pm »

Reading this thread made me miss my Labsubs, I really liked them.
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Nathan Riddle

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Re: LAB subwoofer plans
« Reply #14 on: October 14, 2020, 02:54:39 pm »

The DXF files didn't download correctly, but the PDF's did.  I imported then into AutoCAD LT and scaled them, so if anyone needs a DWG file - let me know.

Where's the dang like button :)
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Ivan Beaver

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Re: LAB subwoofer plans
« Reply #15 on: October 14, 2020, 03:05:49 pm »



Back when there was a lot of folks building them, i recall reports of folks having coils open. And then subsequent talk about small rear chambers and their contribution to heat build up.


During the "era of lab sub building", Eminance had an issue with one of their UV curing stations.  So some of the coils did not get the adhesive properly cured, which resulted in the coils basically falling off of the former and getting trashed.

So basically the drivers did not meet specs, but it was not because of the design, but rather the manufacturing process.

It has happened to others.  Peavey got ahold of some bad adhesive they used on the scorpion drivers spiders back in the early 90s.  The glue would just break free, nice and clean and then the driver would sound bad and beat itself to death.  This happened to several thousand drivers.

B&C got ahold of some bad magnet slurry about 15 years ago.  The creamic magnets would just crack and shear in half, freezing up the driver.  Even on drivers that were not moved around (in an install) and not pushed hard.

Stuff happens.
« Last Edit: October 15, 2020, 08:51:24 am by Ivan Beaver »
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A complex question is easily answered by a simple-easy to understand WRONG answer!

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Doug Fowler

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Re: LAB subwoofer plans
« Reply #16 on: October 14, 2020, 03:24:08 pm »

Hi Doug,

Labhorns's impedance head south after about 90-95Hz, and don't raise much above minimum from there on.
Attached graph is a single box.

Back when there was a lot of folks building them, i recall reports of folks having coils open. And then subsequent talk about small rear chambers and their contribution to heat build up.

So I figure it makes sense to minimize heat from any content above 100Hz, if possible.

Gotcha, thanks. 
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Jim McKeveny

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Re: LAB subwoofer plans
« Reply #17 on: November 16, 2020, 01:49:03 pm »

Arjun,

The LAB horn is difficult  to build, and the performance of the LAB 12 driver is rather limited compared to what is available presently.
Using 18" drivers with more Xmax (excursion) Bl (motor strength)  and power handling allows for 6dB or more output in the same footprint.

If you like FLH (Front Loaded Horn) cabinets, the design below using BC 18SW115 drivers may be a better, as in louder, cleaner and more simple to build choice, the same size (45"x45"x22.5") as the LABhorn.

Only one side is illustrated, the other is symmetrical. Center mouth bracing should be added as shown in red, didn't get the sizes down when originally drawn about 6 years ago.

Art

This is quite clever, Art! Can you give some insight into the angle iron detail?
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Art Welter

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Re: LAB subwoofer plans
« Reply #18 on: November 17, 2020, 04:35:53 pm »

This is quite clever, Art! Can you give some insight into the angle iron detail?
Jim,

IIRC, the use of angle iron and flat iron (or aluminum) for the speaker access panel door frame was a copy of a similar design using 21" drivers that would have had clearance issues if using 3/4" plywood cleats.

For this 18" design, 3/4" x 1"& 2" cleats with t-nuts would probably be my build choice.

Art
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Re: LAB subwoofer plans
¬ę Reply #18 on: November 17, 2020, 04:35:53 pm ¬Ľ


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