no pressure

[PowerNaudio 10+ year member]

if you wire them in phase from each other there would be no pressure and no sound or a very muffled one.

if you wire them out of phase from each other then you have two subs in a sealed enclosure.

 

[yacob.naif 10+ year member]

thinking bout this.....would it be just like a free air sub? but with two.

No.... a free air subwoofer needs to be infinite baffle, or it wont make any sound

this is closer to a dipole install, which has 0 use as a subwoofer install, and requires some sort of elongated rear baffle

 

[Chevyaudio 5,000+ posts]

God....Its a Sealed box nothing more nothing less.

 

[k12ug 10+ year member]

if you wire them in phase from each other there would be no pressure and no sound or a very muffled one. if you wire them out of phase from each other then you have two subs in a sealed enclosure.

thank you.

 

[60ndown 10+ year member]

in phase 1 sub would be trying to pressurise the cab while the other sub would be de pressurising the cab = no bass.

out of phase the design might be fun to play with. ive done it. thing is the airspace inside the sealed box decreases twice as fast as a single sub in a sealed box (cos there s 2 subs shareing the sealed space) resulting in unusual / unpredictable freq response and improved power handling.

good question o.p. but try not to smoke weed and think about subwoofer enclosures too often //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[k12ug 10+ year member]

in phase 1 sub would be trying to pressurise the cab while the other sub would be de pressurising the cab = no bass.
out of phase the design might be fun to play with. ive done it. thing is the airspace inside the sealed box decreases twice as fast as a single sub in a sealed box (cos there s 2 subs shareing the sealed space) resulting in unusual / unpredictable freq response and improved power handling.

good question o.p. but try not to smoke weed and think about subwoofer enclosures too often //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

hahahaha....thanks...and ill try.

 

[azbass 5,000+ posts]

wait whats the second pic? looked like a scribble.

 

[pwnt by pat 10+ year member]

It's just a sealed box with one sub inverted....

 

[creyc 10+ year member]

First, it solely depends on the way he wires the subs.

The actual placement of one driver in the "back" of the enclosure makes no difference at all. May as well "slide" it to the front baffle if it makes it easier to imagine the system.

Okay now you have two drivers in a box, one's inverted, no big deal. If you also "invert" the wiring, that is make it out of phase, it would just be a typical sealed, two subwoofer box. Sure one of the subs would be mounted backwards, but it would also be working reversed, so it would sound just like a normal 2 driver box.

However, if the intention is to run it isobaric, then there are several HUGE problems with that design. The idea here is to run two subwoofers together, that is in phase with each other in order to cut box volume in half. You spend twice as much money on 2 subs, and need twice as big an amp to run 2 subs, and you only get the same output as 1 sub in a larger box. So the comment that isobaric loading is for people with too much money, well, thats partly true. More often than not its for people with not enough space for a big enclosure though.

The problem with that design is that you need the drivers very very close to each other to "couple" acoustically. Generally you face them towards each other and run one out of phase, with just enough space between them that they don't touch, and thats it. In this design there is an entire volume of air in between that will result in the "back" driver not coupling with the front and their produced sound waves most likely canceling each other out.

Back to the drawing board.

 

[AJ²06 5,000+ posts]

Thank U

 

PLEASE TRY AGAIN...

 

 

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