Air Movement!

[75MonteCarlo 10+ year member]

Subs make noise by making air move right? Well if I completely fill my trunk with a sub-box and amps, and there isn't much free air space left, wouldn't that yeild less volume than going with a less excessive system that leaves more trunk space?

On detail, i'm looking at (2) 15" Kicker L7's in a sealed box, running off a Rockford T20001bd.

Maybe go with 2 12"s for more volume? Or does airspace not matter at all, and its just how big and how hard the subs push, no matter how crammed in they are?

Thanks!

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[U n r e a L 10+ year member]

(2) 15" Kicker L7's in a sealed box, running off a Rockford T20001bd will b so loud...if you do it right...make it ported if u want it louder..//content.invisioncic.com/y282845/emoticons/eek.gif.771b7a90cf45cabdc554ff1121c21c4a.gif

 

[SBLAZER]

go wit the 12s ported.

 

[creater 10+ year member]

like the person above said....2 12" ported is all you need...it'll be loud...but there maybe ways of buildin the box to fit 2 15" ported and get all the air space u need

 

[chinny 5,000+ posts]

that amp will do way more than its rated power for sure, me and my bud had a 15" L7 sealed with around 1250w and he blew a hole on the cone. I would do the 15's sealed.

 

[75MonteCarlo 10+ year member]

I thought they can handle like 1500 rms peak can't they? Funny he blew the cone... Anyhow, does the ammount of free air leftover in the trunk matter?

 

[75MonteCarlo 10+ year member]

bump

 

[flakko 5,000+ posts]

yes the amt of airspace in a "trunk" does matter. Well thats how it is for my car.

 

[bamaboy 5,000+ posts]

I thought they can handle like 1500 rms peak can't they? Funny he blew the cone... Anyhow, does the ammount of free air leftover in the trunk matter?

ooh 1500 peak power:naughty:

 

[jellyfish420 10+ year member]

i don't think anyone even answered the real question.

as long as you have enough space to build a proper box for the subs, the amount of "free" space wouldn't really matter. and actually its measured by pressure. and the smaller volume of "free" air in the car the easier it is to compres it //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[UndercoverPunk 5,000+ posts]

Well, since you're building in trunk, you'll probably want to fire them toward the rear. In this case I'd just suggest that you leave enough room on the sides and top to get the pressure into the cabin.

You'll find out soon enough that that is the main problem with trunk cars. Getting the bass into the cabin can at times be a challange.

I have trunk experience. I am currently breaking in my 2 Si d2 12's in the trunk of my 93 caprice. I have a huge ported box (5 cubes net, grosses about 7.3 cubes total) and I'm running them off my mid amp ATM, so they're only getting 300 watts each right now. I've left alot of room on the sides and some on top so they aren't choked as far as the pressure getting back to the cabin. Pretty much as long as you don't seal the front of the box off from the cabin you'll probably be fine.

Just try stuff out, IMO 2 12's would probably be enough for you, esp with that power.

 

[jellyfish420 10+ year member]

or... fire them forward and seal off the trunk from the cabin.

 

[UndercoverPunk 5,000+ posts]

or... fire them forward and seal off the trunk from the cabin.

I dont know exactly how the part of his trunk over the rear axle is, but the way mine is, that's simply not an option.

 

[Lil Poot 5,000+ posts]

i know if you put things in the trunk of a car with a system, it gets quieter. i dont know if this is from the reduced airspace, or maybe its between the woofers and the back of the trunk or what, i just know its louder with an empty trunk.

 

[bigbangtheory 5,000+ posts]

You could port those Kicker 15's and still have plenty of airspace. Those trunks are huge in those cars. Ecspicallly in the older ones.