sealed box question

[Craig]

  How important is sub placement in sealed applications? I'm thinking of doing a sealed box for two L7 15's in an explorer and I'm wondering about the subs up/ subs back difference.

[Ernesto]

Don't think in a sealed enclosure it would matter as much which way you face your subs.

[Craig]

Yeah, I was thinking of doing a box with some plexiglass in it and wanted to make sure placement wouldn't affect things.

[Ernesto]

Yeah, I was thinking of doing a box with some plexiglass in it and wanted to make sure placement wouldn't affect things.

I don't think it would in a sealed box... If it does I doubt it will be noticeable.

[LSN2meBoom916]

I dont think that's right guys.

This is how it has been explained to me/what I found doing research:(in my own words)

By placing a box w/ subs facing the rear of the vehicle (trunk, suv, hatch, etc) the distance the wave has to travel  before it reaches your ear up front is LENGTHENED. By lengthening the path of the wave, you increase the amount of time the wave is traveling through the air as it moves from the front/cone of the woofer outward, then "bounces" off the rear tailgate/hatch/trunk lid and changes direction 180 degrees heading towards the front of the vehicle. This longer "flight path" of the wave and longer time interval causes a "doplar-like" shift in the wave itself and lengthens out the wave. A longer wave will in fact = lower frequency (part of why longer ports = lower tuning) By pointing the subs back there will be a "perceived" lowering of the sound you hear and some say that setup will sound "boomier" (most would agree to be a GOOD thing esp if you're limited on woofer size).

An example of this- If you hear a car/truck DUMPIN from real far away, along with sounding pretty soft/quiet and gettign progressively louder, the first sounds you hear will sound very LOW (hz) and the tone will get higher as the vehicle approaches.

Oh yea and tests prove it.

http://installer.com/tech/aiming2.html

[basshead]

:W: i wasnt gonna get all mr.science on ya LOL but i was gonna say the same thing he just said from my experience facing sealed subs towards the back of the vehicle hitting off of doors or trunks always sounds better

[LSN2meBoom916]

YEA.

Just call me Mr. Science, son.

:W:

HAHAHHAHAHA.

I try not to make "well what I had hurrd was...." posts...gotta back it up w/ some KNOWLEDGE ya knows.