30hz - 150hz horns based on Lab 12? - diyAudio
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Old 26th July 2011, 06:54 PM   #1
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Default 30hz - 150hz horns based on Lab 12?

Folks, I'm looking for a build for my pair of Lab 12's. Though I would also consider single Lab 12 builds.

This will be used along with my Danley DTS-10 and THT which are in opposite corners of the front wall.
I want to use the new Lab 12 horn in the rear of my room towards the top of the wall/ceiling area. I have the ability to mount it between my wall studs with the rear of the enclosure in the opposite room (garage). So I'd prefer it be folded so it's 18" wide to fit between the studs. Otherwise, it can be 94" tall and as long as necessary.

This will be for a Getty style three subwoofer setup to reduce room modes.

Anything out there that might work for me?
It doesn't need to play as loud or low as the DTS-10 or THT. But it should be reasonably smooth up to 150hz if possible.

If the horn pathlength is as long as the DTS-10, that would be a bonus!
The THT will eventually be replaced with a second DTS-10.

Last edited by CZ Eddie; 26th July 2011 at 06:56 PM.
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Old 26th July 2011, 10:30 PM   #2
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That is a difficult request, hard to get a TH to play smoothly over much more than 2 or 2.5 octaves, and using a higher tuned TH with the Lab 12 is not particularly a good use of the driver, and will require a different delay time vs the DTS 10.

Since you are going to need (or want) different DSP settings for different sub designs, you may consider BR (or even sealed) for the Lab 12s.

This design has worked well for me for PA use, for home use you could lower the tuning to 30 Hz by extending the ports if you wanted, which would flatten the response, but loose some sensitivity. As it is, it has a bit of a bump in the 40 Hz range:

FREE SUB PLAN: Dual Lab12 (Front Loaded) by Welter Systems

I have four of the cabinets available for sale, with or without the cones, as I have gone to a TH design for my PA.

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Old 27th July 2011, 01:10 AM   #3
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Thanks for posting that. It would require a redesign though, as it doesn't fit between my studs (18" interior available).
Re-designs aren't a big deal, but I'd prefer to keep it a horn for time-alignment reasons.

I can't seem to sell my Lab 12 subwoofers, so I might as well put them to use. If I could just get 120hz, I might be happy with that?
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Old 27th July 2011, 02:31 AM   #4
djk is offline djk
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The mass corner of a LAB 12 driver is less than 110hz, it will roll off above that frequency.
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Old 27th July 2011, 03:15 AM   #5
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ugh. thanks.
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Old 27th July 2011, 08:39 AM   #6
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If you had eq as an option to you, I'm sure it wouldn't be too difficult to get 10 more Hz at the top end.
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Old 27th July 2011, 09:31 AM   #7
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The roll-off is only 6dB/oct at that frequency, so only about 4dB of EQ will be needed at 160hz.
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Old 27th July 2011, 02:42 PM   #8
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Quote:
Originally Posted by CZ Eddie View Post
.. Though I would also consider single Lab 12 builds.

..So I'd prefer it be folded so it's 18" wide to fit between the studs..

..Anything out there that might work for me?..

..It doesn't need to play as loud or low as the DTS-10 or THT..

But it should be reasonably smooth up to 150hz if possible..
Hi,

Here's a suggestion of what you could do complying with your BW requirement:

Build two OD-TL's using one driver or just by doubling the CSA:s fit two drivers but keep the line length as is.

Not shown in the picture here below:

It,s also possible to build two flat FR T-TQWT's(~130L/driver,116.8dB-max) with f-3dB at ~15 Hz but the upper boundary must then be allowed to be <=115 Hz.

b
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File Type: jpg LAB12-OD-TL.JPG (593.6 KB, 346 views)
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Old 27th July 2011, 03:34 PM   #9
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Quote:
Originally Posted by CZ Eddie View Post
fit between my studs (18" interior available).
So 19.5" c to c?

That's not standard. 16" and 24" are standard in North America. What kind of wall is this?
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Old 27th July 2011, 03:58 PM   #10
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I do have a MiniDSP EQ which has I think six bands to use.

The wall & studs were customized by me to hold four 15" 16hz tuned subwoofers, but I eventually decided against that. So there is something like 17.9" space BETWEEN the studs. I think it's double-studs on each side for strength.

Bjorno, I'm not up on TL enclosures, but I like the frequency response graph! Did you mean -3db at 30hz?
Any names for that enclosure so I can google it to find out more?
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