i was chillin at my local audio shop and heard of a new way to install subs...its called clamshelling them
ok..take a box built for ONE sub...place it in the hole like u normally would..then, take another sub (same brand, kind...derr) and place it where the two cones are facing each other...then wire the sub hanging out out of phase (fase...sp?)...
yeah, its been around a while. it's to basically save space if needed. i was going to either do a clam shell or isobaric enclosure to fit in the center of my truck (in the rear).. then said the hell with it, and did 2 sealed instead, lol.
EDIT: and oh yeah, lol, you had the spelling right the first time "phase"
you've got to be careful when building one. the bottom sub has to have a certain enclosure size (forget what exactly you need to look for). but no, there wont be any difference or gain. itll basically look like one sub in the end, but with that extra 3dB of the second within
Another enclosure design that you may hear of is isobaric. Isobaric is not actually an enclosure type but a woofer loading method. Isobaric loading can be used in conjunction with any of the enclosure types, except perhaps infinite baffle. Isobaric loading consists of two woofers coupled together by a short enclosure which is only long enough to prevent the two woofers from striking one another. The woofers may be mounted face to face, back to back or front to back. It is important however to have the woofers firing in phase with one another. In order to accomplish this with the woofers firing front to front or back to back one of the woofers speaker leads must be reversed with respect to the other woofer.
Isobaric loading is usually used when space is at a minimum or a maximum number of woofers wish to be used in a certain volume of space. By isobarically loading the woofers, a box of only half the size of a one woofer box is needed. For example, if a 12" woofer requires a two cubic foot box, the same 12" woofer isobarically loaded only requires a one cubic foot box. The cost of this design, other than doubling the woofer cost, is a reduction in the subwoofer system efficiency by three decibels (if both woofers are given the same power as a single woofer), which is equivalent to halving the amplifier power. New, small box subwoofer designs have all but negated the need for isobaric loading in car audio and it has fallen out of popularity.
if youre short on room, this might be good, but youre gonna lose some dB, not gain any.
whats it called when the subs are mounted in reverse? with the magnets hanging out of the box?
does that work good?
anyway...i'm tight on space, and i got 2 10's that i still want in my truck...
mounting the subs with the magnets out won't do anything, performance wise. some do it for looks, some do it for a slightly smaller box in the end. its easier to build a box to the certain volume needed, and reverse mount them, if you're not sure how to take away the amount of volume a sub will take up when mounted in the box.
Example: you have a sub, and it calls for a 1ft^3 sealed enclosure. you're not certain of the volume of the sub. reverse mounting the sub on the sealed enclosure will allow you to keep that 1ft^3 of airspace you built the box to (with the exception of the new added volume within the sub cone ((usually small enough not to make a difference))).
So far with college full time, work full time and household responsibilities piling up, (we're selling our house soon), I've only got the second piece for the sides cut out. I've got a friend coming over to help me rip a board, so I can get the back, bottom, and whatever else on there before I glass the top and front. I wont be able to get my sub until next semester, though. College is freakin' expensive. A friend of mine is giving me an HCCA 250 so I can get my system up running asap. I'll try to post some pics of it when it's done!
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