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Old 1st October 2013, 10:42 AM   #1
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Default Street box

Hi everyone
I am designing (copy) a dual ported lab12 box that I see flowing around. I did a little adjustment to the box for it to have four triangle port instead of two.

Can someone please let me know if the adjustments I made are ok.

Thanks



Lab12 port.jpg

Last edited by Beat Street; 1st October 2013 at 10:58 AM.
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Old 1st October 2013, 04:16 PM   #2
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Looks like my WS Lab 2x12" Vb and Fb.
Vent velocity is even lower than mine, a good thing.

You cut off the vent depth and size information, will they fit in the box with out a bend and still clear the back by more than their width?

Why such a thin box?

Art
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Old 1st October 2013, 05:31 PM   #3
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Hi Art
Yes this is a copy of your box with a little adjustment to it.
I did not build this box yet.
Would it be better it I design the box a little wider.
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Old 1st October 2013, 08:22 PM   #4
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Quote:
Originally Posted by Beat Street View Post
Would it be better it I design the box a little wider.
Better for what?

The thin box gives increased frontal area, which is a good thing for a single cabinet, but bad for stacking on.
Or if the speakers go on the thin side, decreases frontal area, good if you want to cram lots of speakers in a small frontal area.
Four ports strengthen all the corners, a good thing, but may require bends (if the front is 28 x 28), which will mean experimentation to see if the box Fb remains as designed.

There must be a reason you are planning to change my design, I just don't understand what your reasons are.

At any rate, I have a pair of the originals for sale, unloaded, loaded with a single Lab 12 and a cover plate, or unloaded if anyone is interested, cost is around materials + shipping from 87505.

Last edited by weltersys; 1st October 2013 at 08:25 PM.
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Old 1st October 2013, 11:07 PM   #5
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Art
What do you mean by, may require bends.

I change the design because I don't understand the drawing that is posted on the web.
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Old 1st October 2013, 11:30 PM   #6
sine143 is offline sine143  United States
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he means that because you have increased the number of vents, you have likely increased the overal vent area, meaning your vents are now longer to achieve the same tuning (although you do reduce port velocity). now if you change the depth of the design, you may have to "bend" the ports to achieve sufficient vent length, which means you may change the Fb, as the vent volume will be taking up some of the volume from the box.
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Old 2nd October 2013, 01:38 AM   #7
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Quote:
Originally Posted by sine143 View Post
he means that because you have increased the number of vents, you have likely increased the overal vent area, meaning your vents are now longer to achieve the same tuning (although you do reduce port velocity). now if you change the depth of the design, you may have to "bend" the ports to achieve sufficient vent length, which means you may change the Fb, as the vent volume will be taking up some of the volume from the box.
Sine143
Thanks. I learn something new.
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Old 2nd October 2013, 01:40 AM   #8
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Default lab pic

This is what the box look like


lab.jpg
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Old 2nd October 2013, 03:45 PM   #9
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Quote:
Originally Posted by Beat Street View Post
This is what the box look like
That should work fine, though I'd lay it down flat and put a pole mount in to support the top cabinet.
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Old 2nd October 2013, 04:09 PM   #10
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Quote:
Originally Posted by weltersys View Post
That should work fine, though I'd lay it down flat and put a pole mount in to support the top cabinet.
Thanks Art
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