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Hey, I was just wondering what is the difference between a two 12" sub box that has a divider in the middle between the two subs and one that doesnt have the divider... I'm sorry if that did not make much sense =S

thanks

 
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the divider your talking about is called vented....not really sure what's the difference but i will tell you this.

I have 2 Alphasonik 12's 600 series 700watt RMS with 1 MonoBlock Alphasonik Amp worth 1600 watss @ 1oh (right now i'm wired at 4ohm) and well in the Sealed Box i could only hear the bass inside my car only and not outside and it was BEATING HARD AS HELL!!!! Now with my vented box like the one your talking about it beats EVEN HARDER INSIDE AND OUTSIDE....so yea tha's my .02



but i guess the SUBS play a factor in the type of box to use.

 
Rep Power: 292

thanks, mr. modify ... but what you are talking about is a ported box right? with the vent design in the centre? what i mean is like i see some sealed boxes where its all clear inside with nothing down the centre and there are some that have another wood wall that divides the two areas for the two subs ..

 
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The divider is to make two separate enclosures from one box. This is so each sub would have, say 1 cu. ft. each instead of 2 cu. ft. shared between them. It is also a good idea for bracing a heavy box, but you need to make sure there is a good seal between the two subs.

 
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alright thanks! there wont be any harm in having two subs share the same space right?

 
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nah, no harm at all. The only thing is if one of them stops working for whatever reason, it could act like a passive radiator. If the other is still works, it could encounter overexcursion with the extra airspace/passive radiation and get mad.

 
Rep Power: 787

No harm, but IMO it's not how a proper box should be. It is ideal to have both subs in their own airspace, so they do not mess with each others space. Obviously with 1 large airspace you have the back pressure from each sub interfering with the other, and it won't sound as good. The air inside the box will be looser (for lack of a better term), and the bass produced will be more boomy.

Speaking from a construction point of view, when your subwoofers are belting it out, there is a retarded amount of pressure inside the box, and without a brace, your box will flex a lot and again produce a crappy sound.

There are many more reasons that I could rant on about to prove my point, but I won't bother.

And not to step on anyones toes, but the divider between the subs is not called vented at all. I don't even care to know where that came from. No offense meant of course. The term vented refers to a ported enclosure, totally unrelated to any internal bracing in the box.

 
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The internal peice you are speaking of is a septum.

 
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alright thanks everyone... I think i understand it all very well now...

 
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sorry to butt in, but i think this relates to the topic

in my box that the shop i went to built, the divider has a 4 in. square cut out( according to them it produces more power that way)

could that be interfering w/ each other making it sound crappy?

cuz when one goes in the other goes out.

does that mean they're not hitting the same note at the same time?

 
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Yeah, that's unusual especially since a shop did that for you... I don't know what to think

 
Rep Power: 329

When one goes in and the other goes out, are you talking about that happening when they arent playing, and you push on them, or when its playing a song?

 
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theoretically, it could mean a gain in sound. if there were any differences between the woofers or box chambers, then it would result in the speakers achieving different excursions, reducing output and maring the quality of sound.

poking the hole in the box forces the speakers to share air. This will make cone motion all but uniform comparitively.

personally, i think their excuse is full of hot air, but i agree with what they did.

I think the divider with holes is the best way to go, as it means youll get the great advantage the divider offers, that is of bracing, and allow the woofers to share airspace as well.