Free Air vs Enclosed - Chevy Impala SS Forum
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post #1 of 59 (permalink) Old 02-01-2007, 06:37 AM
SSmilin-95
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I'm looking to add a 12inch sub into my trunk, instead of 2 10's as I have an MtX 8955 with the 5th channel putting out 320rms on 2ohms.

What is the diff between a free air vs enclosed? Sounds like something that makes more sense as I could possibly mount it to the rear seat-backing frame from inside my trunk, faceup against the frame I suppose, instead of having to build an enclosure of some sort at either quarter panel or in a box.. Am I right or is this a folly? And do freeair subs require more rms to drive them?

I've got a choice between a Clarion 12in dualvoice 4ohm, Kicker 12in 2ohm needing to be closed and an MTX 12in free air at the same price.

I don't know what the diff is either with a 2ohm sub or a 4ohm sub. Too many choices, not enough education. I think I could spend all day searching the web for options but figured I ask some Impy guru's for their advice first.

My objective as I'm building a cheap or basic sound system is getting some good base, but with the least amount of hassle and minimal contraint on my pocketbook and space in my trunk.

What's your opinion?
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post #2 of 59 (permalink) Old 02-01-2007, 06:43 PM
1SS2HEAR
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In one of my early systems I used a free air setup using two 10" woofers there is a lot of low bass but you have to be careful in overpowering them. You also have to completely seal of the the trunk from the cabin so that the rear sound waves don't mix with the front. John Pitts 1998 USAC and IASCA Expert class champion in the Reaper used this setup but would usually blow at least one woofer at Finals. I personally prefer sealed boxes do to them being more predictable in all frequencies. Depending on what ohm load your amp is capable of playing depends on what ohm speaker you need. For maximum power you want to keep the ohm load of the speakers as close to the minimum ohm load of the amp. A lower ohm load does cause more heat which can sometimes make the amp go pop. Just my two cents. I'm sure there will be others to disagree with me.
post #3 of 59 (permalink) Old 02-01-2007, 07:06 PM
hustlepayper
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free air sups look great in the rear deck of b-bodys

but I gotta vote for a ported encloser if you do an encloser proted to specs and run 1 nice 12" you will sound like 2 sealed 12"s
 
post #4 of 59 (permalink) Old 02-01-2007, 07:28 PM
bbodyguy
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Free air FTW!
For normal music, it really rocks, even at decent levels. It will not however, rock the neighborhood. If yo want good, clean, MUSICAL bass, free air is great. If you like rap, or whatever, and need thump that people can hear down the block, you need a box.
If you want to do permanant damage to your hearing, be partially deaf before you turn 30, get a box.
Oh, nice little benefit of free-air - you get to have a useable trunk. Also, does not require gobs of power, and is much harder to steal.
And no, you don't have to get all anal about sealing the trunk, just mount them to a baffle board, screw it down really good to the seat back, (maybe with some foam to isolate the two - and prevent rattles), and have at it.
If you are building a home theater, and have a spare room (attic or basement) NOTHING beats an ib setup. I really wish I had an attic or basement near my HT!
post #5 of 59 (permalink) Old 02-01-2007, 10:11 PM
SSmilin-95
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I think I'll stick to enclosing a sub, eventhough freeair sounds like what I want as it seems to offer less of a hassle.

What I won't need is more than one sub then, in the trunk, probably a 12 and set the gain a little lower.

I like some classic rap sometimes but mostly a variety of music, just none of the new MOFO stuff.

Thanks a bunch guys, it makes my decision a lot more clear.

PS: Give a listen to Kazzer's "Petal to the Medal". That's my Imp's theme song. Download the vid as well.
post #6 of 59 (permalink) Old 02-04-2007, 01:19 AM
PIMPALA-SS
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Quote:
Originally posted by bbodyguy (o) (o):
And no, you don't have to get all anal about sealing the trunk, just mount them to a baffle board, screw it down really good to the seat back, (maybe with some foam to isolate the two - and prevent rattles), and have at it.
sorry, but this is the worst thing you can say to anyone wanting to build an IB setup.

sealing the front of the speaker from the rear, is the single MOST important thing that you can do.

you might get some bass if you do what you just suggested, but it will be nowhere near what it could be, and it will be twice as easy to blow the subs.
post #7 of 59 (permalink) Old 02-04-2007, 07:59 AM
bbodyguy
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Quote:
Originally posted by PIMPALA--SS:
</font><blockquote>quote:</font><hr />Originally posted by bbodyguy (o) (o):
And no, you don't have to get all anal about sealing the trunk, just mount them to a baffle board, screw it down really good to the seat back, (maybe with some foam to isolate the two - and prevent rattles), and have at it.
sorry, but this is the worst thing you can say to anyone wanting to build an IB setup.

sealing the front of the speaker from the rear, is the single MOST important thing that you can do.

you might get some bass if you do what you just suggested, but it will be nowhere near what it could be, and it will be twice as easy to blow the subs.
</font>[/QUOTE]I respectfully ***-agree.
What should the average bear do about the 6X9's?
The baffle board that hack sells is pretty occlusive to the back seat, but you are not going to seal the 6X9's off.
There are MANY of these set-ups running around, and even some that one sound competitions.
And the IB sub needs nothing for suspension, it has it "built in", it does not need the sealed trunk to survive. This one of the nice things about the IB set up, it is very efficent.
It may be very slightly di-pole ish, but hey- some of the best speakers known to man are. Check out
these for the home. There are plenty of designs like this coming out.

[ 02-04-2007, 09:09 AM: Message edited by: bbodyguy (o) (o) ]
post #8 of 59 (permalink) Old 02-04-2007, 08:15 AM
bbodyguy
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Also- see if you can listen to someone with this set up. Most are amazed when I tell them it is an IB.
post #9 of 59 (permalink) Old 02-04-2007, 08:26 AM
C. Simpson
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Well, you guys have now thoroughly confused me. I have two kicker "free air" subs and I built a baffle board that I was planning on mounting behind the rear seat. How would you seal the front of the subs from the back?
post #10 of 59 (permalink) Old 02-04-2007, 08:32 AM
bbodyguy
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Mount them to the baffle board, and see how it sounds.
I am willing to bet you will like it.
I mounted the baffle board very secure; using big honking wood screws from the seat side, and some open cell foam between the seat back and baffle board (not where the drivers were though) to compress the baffle board to the seat back.
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