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» Termpro Audio Forum » Component Specific Topics » Subs and Enclosures » are subs that are sharing air space bad?

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Author Topic: are subs that are sharing air space bad?
slim823
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Lets say you have a box that is 6ft^3. you have 2 woofers, thay each need 3 ft^3. Would it matter if the woofers shared a 6ft^3 airspace or would it be better if the enclosure had a wall separating the 2 woofers and still giving them about 3 ft^3 of space. Whats the answer and why?

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Posts: 1340 | From: Cleveland, Ohio | Registered: May 1999  | Report this post to a Moderator
sqhopeful
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i am not sure but...i think it has to do with what mode your amp is running in

Stereo mode: DIVIDER because the left woofer made be playing something different than the right

Mono mode: NONE becuase the speaker are always playing the exact thing

I think this is how it works, can anybody back me up?

hope this helps

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Posts: 344 | From: Columbia, MD | Registered: Sep 1999  | Report this post to a Moderator
JLcrossfireJL
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I have 2 JL 10w3 d-4 and i have a 5 cuft ported box and i run my amp a crossfire 602 in 2 ohm stereo and it sounds great, i am doing a 142.5 in a mostly sound q box(65% sound q 35% spl in a Ford Probe GT)

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Posts: 294 | From: Omaha, NE USA | Registered: Jun 1999  | Report this post to a Moderator
Iz
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I agree with buggsz24.

Iz

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Posts: 73 | From: Oklahoma | Registered: Jul 1999  | Report this post to a Moderator
Blu
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Hi slim 823

I asked a similar question to yours. You can find some further info under;

"Sub Enclosure Question" posted by Blu on 08/25/99. You will have to go back to Questions asked over last 30 days.. page 2 I think.

I hope this helps!

Cheers!

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Posts: 240 | From: Ontario, Canada | Registered: Aug 1999  | Report this post to a Moderator
capple
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Dukk told me once when I had my subs in seperet boxes to cut holes between some to get a shared air space. It did seem to help a bit.

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Capple
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Posts: 346 | From: MN, USA <IMG SRC=http://fp.geocities.com/capple.geo/mazda/truck1t_100x75.JPG | Registered: May 1999  | Report this post to a Moderator
audioextreme
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Actually if you are running Mono. I recomend a divider with holes as well. Because even when you do your best dividing up a box you still get uneven airspaces and that affects the performance more than the manufactuer tolerance issues.

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Posts: 289 | From: Howell, MI | Registered: May 1999  | Report this post to a Moderator
wheels94
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Just how irreglar can the enclosure of a sealed-box be.? as long,as the proper
ammount of air space is kept?,espcially
in the depth measurements, say like a
fraction or two,clearing the magnet of the sub. itself...

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Posts: 91 | From: Southern~~~~Mississippi | Registered: Jul 1999  | Report this post to a Moderator
wheels94
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Just how irreglar can the enclosure of a
sealed-box be.? as long,as the proper
ammount of air space is kept?,espcially
in the depth measurements, say like a
fraction or two,clearing the magnet of the
sub. itself...
BB gave me no TOPIC opt..
damn... sorry, DBL post
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!! Rock'n The World !!

[This message has been edited by wheels94 (edited 09-15-99).]


Posts: 91 | From: Southern~~~~Mississippi | Registered: Jul 1999  | Report this post to a Moderator
capple
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Air is a fuid and tack the shape of it's container. The only thing you need to have more then enough depth for is ports. I do belive it is one or two times the diamitor from the mouth of the port to the wall. Seald your OK still.

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Capple
SPLnDB2
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Posts: 346 | From: MN, USA <IMG SRC=http://fp.geocities.com/capple.geo/mazda/truck1t_100x75.JPG | Registered: May 1999  | Report this post to a Moderator
capple
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Air is a fuid and takes the shape of it's container. The only thing you need to have more then enough depth for is ports. I do belive it is one or two times the diamitor from the mouth of the port to the wall. Seald your OK still.

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Capple
SPLnDB2
www.geocities.com/MotorCity/Flats/9916/


Posts: 346 | From: MN, USA <IMG SRC=http://fp.geocities.com/capple.geo/mazda/truck1t_100x75.JPG | Registered: May 1999  | Report this post to a Moderator
HccaIntegra
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ok here is my vew on this since almost all the enclosure's i build are common chambered..more than 1 woofer per enclosure.
I have built many ,many 3 woofer boxes and with no deviders all 1 chamber WHY? you ask because you dont need as much air space. The effecincy of the woofers goes up and you dont need as much power. Power handleing can be changed very easily with this style box,need to handle more power make it smaller need it to handle less power make it a little bigger..easy

I dont belive there is a 100% accurate formula to figure ot the reccomended airspace for a common chammber boxbut this is how i do it an it seems to work really good for me. youll need to figure out the required airspace for the style of woofers your using first...lets say 1,0 cubicft per woofer.

1.0 for the first woofer.
.5 for the 2nd
.5 or .25 for the 3rd
so what you end up is a box thats 2.0-1.75 for 3 woofers instead of 3cubft for 3 woofers. This setup has worked many a time for me and i havent had any complaints the onluy thing to consider is which style of box to buil a sq box or a spl box . But this is my opinion and mine only.

p.s. JL rcommends a common chambered enclosure for their ported 3-w6 boxes

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Posts: 65 | From: St.Peters, Mo. | Registered: Jul 1999  | Report this post to a Moderator
   

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