a 10 cubic feet subwoofer box or 2 5 cubic feet boxes?

so I have these 2 15" kicker CVRs and I am about to build 2 subwoofer boxes 5 cubic feet @ 30 hz each (50 square in port and about 24 inch long)

but I could also do 1 big 10 cubic feet box for my 2 15" cvrs sharing the whole inside volume of the box, and also set it a 30 hz with the proper port dimmensions. I was thinking 100 sq in of port and I will compute the length.

what set up will give me the mos SPL, 2 individual 5 cubic feet plus port per box or one large 10 cubic feet plus port.

btw they will be placed were the back seat used to be in my chevrolet extended cab. and they will be facing upwart, both sub and port.

Regardless of the amount of air volume needed behind each woofer, an enclosure where each woofer has its own air space has a few advantages:
1) stucturally more solid – the less square-footage of panels around a single enclosure, the less the panels move or resonate.
2) a smaller enclosure generally results in more controlled bass. A single huge enclosure wont sound as "tight", even with the larger port and double the driver surface area. This is a subjective advantage.
3) if a woofer blows out in a single large enclosure shared with other woofers, it’s essentially the same as making the inside of the enclosure larger, causing the remaining good woofers to move more at low frequencies (higher excursion), putting the other driver(s) in danger of damage from overexcursion. Putting each woofer in its own enclosure isolates the woofers mechanically.

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4 Responses to “ a 10 cubic feet subwoofer box or 2 5 cubic feet boxes? ”

1. Drake C says:

   July 13, 2009 at 9:43 pm

   ok..i should be able to help since i have been an installer for about 3 years now. the one that gets me is that you need 10cubes!!! that is a massive amount of space! i have 2 solo-baric l7 15’s" in one big ported box and it is only 6cubes…and i know for a fact that they need more room and hit harder. the main thing for you is to look at threcommendeded spl box specs and then add about 1-1.25cubes to it. anyways…sounds like it will be a nice setup once everything gets worked out.
   References :
2. Trixter says:

   July 13, 2009 at 10:32 pm

   SPL wise will be the same provided each box is eaxctly 1/2 the larger one. building one box has its advantages because you only need to go though the trouble of building one.

   i’d just do the single box.
   References :
   installing for 15+ yrs.
3. Erik Schorr says:

   July 13, 2009 at 11:10 pm

   Regardless of the amount of air volume needed behind each woofer, an enclosure where each woofer has its own air space has a few advantages:
   1) stucturally more solid – the less square-footage of panels around a single enclosure, the less the panels move or resonate.
   2) a smaller enclosure generally results in more controlled bass. A single huge enclosure wont sound as "tight", even with the larger port and double the driver surface area. This is a subjective advantage.
   3) if a woofer blows out in a single large enclosure shared with other woofers, it’s essentially the same as making the inside of the enclosure larger, causing the remaining good woofers to move more at low frequencies (higher excursion), putting the other driver(s) in danger of damage from overexcursion. Putting each woofer in its own enclosure isolates the woofers mechanically.
   References :
4. Hunter H says:

   July 13, 2009 at 11:41 pm

   that’s alotta airspace for cvr’s but the single box would give you the highest spl
   References :