ralimore Posted May 17, 2012 Report Share Posted May 17, 2012 (edited) In every single box I have built in the past each sub has had its own airspace sealed off from other subs by an internal wall. I admit I am way out of date on enclosure theory. That being said, I have seen and heard several nice systems lately and some have subs sharing airspace in the box. Now comes the questions part. When 2 subs share the same air(for example a 6cu box with 2 subs in it) does each sub act like its in 1/2 the airspace or does it act like one sub in the whole airspace? If 2 subs share an airspace do they fight against each other or act like one big sub? What are the cons/pros to open chambers as opposed to each sub in its own? I am building a box/wall in an 08 nissan frontier kingcab and am still playing with design as I try to maximize airspace and not have to move my front seats up. If I build it with seperate chambers sealed off from each other inside the box It will change how I brace for flex using the center as a main brace. If I leave the inside open (except for bracing) then how do I figure volume to correctly port? 1/2 the airspace per sub? I really dont want to do as I have in the past with boxes and keep pulling them out and remaking them to get what I want. This needs to be a one time get it right. Retuning will not be a problem as I plan to either make a drop in or use aeros, so I just need to get the enclosure built right first. Planning on 2 RE sx 18s. I guess what I really need to know is seperate or shared airspace in the 12cu enclosure. Edited May 18, 2012 by ralimore Quote I don't care if you can hear me from down the block....I just want to make sure you FEEL me from there... I'm a swinger, can I borrow your wife for a few? Link to comment Share on other sites More sharing options...
fecupe2001 Posted May 18, 2012 Report Share Posted May 18, 2012 The expression you are looking for is "common chamber" , you have always used seperated chamber, i´ve tested this myself a few times, and i LOVE how performs a common chambered box, also, you save some good internal space of the box by doing this. Common chamber FTW hehe Quote I´m the SPL Gains topic creator!! wanna get louder?? check this: SPL Gains. Panamenian 2009 & 2010 & 2014 Bass Race 149.9 Champion! 2 15" subs and a 2K wired at 1 ohm, http://www.stevemeadedesigns.com/board/topic/167788-fecupe2001-2-15s-on-a-2k-video-on-page-3/ 8 Massive 15" subs and small power, http://www.stevemeadedesigns.com/board/topic/179296-fecupe2001s-8-15s-4th-order-bandpass-wall/ Link to comment Share on other sites More sharing options...
Akslowroller Posted May 18, 2012 Report Share Posted May 18, 2012 Well I'm no pro however every box I build where the subs share air space I take recommended ported box size and multiply it by number of subs. The three boxes I've built have turned out well. Could have been dumb luck. As far as porting I also went with manufacturers recommendations. Quote Link to comment Share on other sites More sharing options...
Joe X Posted May 18, 2012 Report Share Posted May 18, 2012 You will definitely save space with a common chamber. Quote Link to comment Share on other sites More sharing options...
ralimore Posted May 18, 2012 Author Report Share Posted May 18, 2012 So, does each sub "see" half of the airspace or do they act like there in the box by themselves. Will each sub see 6 or 12 cubes? Quote I don't care if you can hear me from down the block....I just want to make sure you FEEL me from there... I'm a swinger, can I borrow your wife for a few? Link to comment Share on other sites More sharing options...
iamamp3pimp Posted May 18, 2012 Report Share Posted May 18, 2012 So, does each sub "see" half of the airspace or do they act like there in the box by themselves. Will each sub see 6 or 12 cubes? 6good luck with the build. Quote (2008) Florida State Champion Bass Race 140-149.9 (2008) Florida State Champion Bass Boxing Middleweight Class Link to comment Share on other sites More sharing options...
ralimore Posted May 18, 2012 Author Report Share Posted May 18, 2012 Thats what I was assuming but since this place exists I wanted to get verification. Thanks! Next step, pull all the trim and seats out of the back and get actual measurements. That and whatever I decide to use to deaden the back of the cab with.. Quote I don't care if you can hear me from down the block....I just want to make sure you FEEL me from there... I'm a swinger, can I borrow your wife for a few? Link to comment Share on other sites More sharing options...
EdgarG0721 Posted May 18, 2012 Report Share Posted May 18, 2012 Each sub will see 3 ft not 6 Quote Link to comment Share on other sites More sharing options...
ralimore Posted May 18, 2012 Author Report Share Posted May 18, 2012 (edited) Split airspace...got it Edited May 18, 2012 by ralimore Quote I don't care if you can hear me from down the block....I just want to make sure you FEEL me from there... I'm a swinger, can I borrow your wife for a few? Link to comment Share on other sites More sharing options...
EdgarG0721 Posted May 18, 2012 Report Share Posted May 18, 2012 (edited) didn't see the 12 ft tought it was 6 but yeah they split the airspace Edited May 18, 2012 by EdgarG0721 Quote Link to comment Share on other sites More sharing options...
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