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[Primo Desiderio]

Can you guys with Labs post some pics, I have never seen a 12' Lab?  I don't even know how big or small on is?

[Ivan Beaver]

http://www.prosoundweb.com/lsp

[Evan Kirkendall]

A quick search got me this:
 http://srforums.prosoundweb.com/index.php/m/23729/6178/?SQ=0 7d6f4a53510dac015d92fd7d37a0f8c#msg_23729




Evan

[Primo Desiderio]

Is that really where you have your subs set up?

[Evan Kirkendall]

Primo Desiderio wrote on Sun, 05 March 2006 22:21

Is that really where you have your subs set up?

Not my house.

I pulled it off that link to give you a sample pic.


Evan

[Alan Star]

Evan Kirkendall wrote on Mon, 06 March 2006 00:26

A quick search got me this:   http://srforums.prosoundweb.com/index.php/m/23729/6178/?SQ=0 7d6f4a53510dac015d92fd7d37a0f8c#msg_23729 Evan

Can any one tell me if this is the way LAB subs are designed to stack, is this the right way round ?

[The Guy]

As with any horn loaded subwoofer, stacking so the horn mouths couple generally produces the best results.  Increasing the size of the mouth by coupling (generally 4 boxes or more) will improve your low frequency cutoff, efficiency, and directivity.

Labs are pretty good as a single box, very good with two, but become a religious experience when you get a block of 4 or more going.  

When I use just two boxes per side, I've tried them vertically (mouths down) and horizontally, one on top of another.  I haven't really been able to tell a noticeable difference between the two configs.  The setup in the photo doesn't seem very practical for live use, unless you're throwing them under a short stage or something.

As always, YMMV.

-JB

[Bogdan Popescu]

Speaking off...

Do you think that configuring the LAB's like this under the stage, they still couple together ???

_____________________________
|_____|______|______|______|

are the first and the last not to far away from eachother ?

Bogdan

[Too Tall (Curtis H. List)]

Bogdan Popescu wrote on Sun, 16 April 2006 15:12

Speaking off... Do you think that configuring the LAB's like this under the stage, they still couple together ??? _____________________________ |_____|______|______|______| are the first and the last not to far away from eachother ? Bogdan

They do couple…and in a very bad way.

You have made a horizontal line array. All the bass will be down the center and none on the sides. If you do this you must go ALL THE WAY from one side of the room to the other.

Ask Al Limberg about this. He did it outdoors and couldn’t believe how little bass he had on the sides.

The other option is the Mark Seaton fix.
Put a 2nd order low pass on the outside boxes. That will both delay them and filter out some high bass on the outside boxes. Then at higher frequencies the horizontal line array is only a couple boxes wide and will spread instead of beam down the center.

[Bogdan Popescu]

Thank you,

didn't know it is SO critical !!!

The whole situation is little different because the whole stage is surrounded by walls, left, right and behind. 48h nonstop drumandbass music.
The pics are 1 day before, we made some testing. The final setup was with 2 midbas on top of the LAB's and we put 4 more full-range on top of the sidewall's, something like disco setup.

The problem last year was that we had good sub-bas only 30m deep, then aprox 10m no sub, then again good sub and so on...

We have to try a different setup this year because there will be a stage too.