which direction to face a sub in a jeep?
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=108142
Printed Date: May 01, 2024 at 11:41 PM
Topic: which direction to face a sub in a jeep?
Posted By: deegz97
Subject: which direction to face a sub in a jeep?
Date Posted: October 14, 2008 at 12:36 AM
Hi all, I am wondering which way I should face a 12" sub inside a Jeep Grand Cherokee - towards the front, or towards the liftgate? I am looking for a 'sound quality' type of reproduction. The sub will be in a sealed enclosure. Thanks in advance!
Replies:
Posted By: KarTuneMan
Date Posted: October 14, 2008 at 7:38 AM
Down..... if the sub will work properly down fired. Someone here will post the formula for figuring this out! -------------
Posted By: whiterob
Date Posted: October 14, 2008 at 10:56 PM
KarTuneMan wrote:
Down..... if the sub will work properly down fired.
Someone here will post the formula for figuring this out!
Sag = 24,850 / ( Xmax * Fs²)
You will get a percentage when you calculate this out. The percentage must be under 5% in order to be able to downfire you subwoofer.
Posted By: mcben789
Date Posted: October 15, 2008 at 5:18 PM
I have my Alpine facing the liftgate and it sounds fine.
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Sasquatch...
We know your legend's real...
Posted By: dangerranger96
Date Posted: October 15, 2008 at 8:49 PM
whiterob wrote:
Sag = 24,850 / ( Xmax * Fs²)
You will get a percentage when you calculate this out. The percentage must be under 5% in order to be able to downfire you subwoofer.
What is "Sag" in this? ------------- 97 F150, Sony CDX-M630, Sony XM-2165GTX, JL Audio 12W3D2, Planet Audio VX-602, Memphis 15-MC5.7
Yeah it's a mutt, but mutts make the best dogs!
Posted By: whiterob
Date Posted: October 15, 2008 at 10:47 PM
dangerranger96 wrote:
whiterob wrote:
Sag = 24,850 / ( Xmax * Fs²)
You will get a percentage when you calculate this out. The percentage must be under 5% in order to be able to downfire you subwoofer.
What is "Sag" in this?
When you downfire a sub the sub will 'sag' due to gravity pushing down on the suspension. The weight of the sub causes the sub to sag. If your sub does not have a large enough Xmax or high enough Fs then the sag will be high. This means when you downfire your sub it can cause the sub to overexcurd which will result in the sub blowing.
Posted By: KarTuneMan
Date Posted: October 15, 2008 at 10:51 PM
When you downfire a sub the sub will 'sag' due to gravity pushing down on the suspension. Gravity does not push..... it pulls!  -------------
Posted By: whiterob
Date Posted: October 16, 2008 at 11:48 PM
KarTuneMan wrote:
When you downfire a sub the sub will 'sag' due to gravity pushing down on the suspension.
Gravity does not push..... it pulls!
Lol, as soon as I wrote that I knew someone was going to call me on that. 
Posted By: dangerranger96
Date Posted: October 17, 2008 at 8:07 PM
is xmax in metric or standard(US)
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97 F150, Sony CDX-M630, Sony XM-2165GTX, JL Audio 12W3D2, Planet Audio VX-602, Memphis 15-MC5.7
Yeah it's a mutt, but mutts make the best dogs!
Posted By: dangerranger96
Date Posted: October 17, 2008 at 8:10 PM
lets put it this way... I have a JL 12w3d2 and im trying to figure out whether this will work with this sub
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97 F150, Sony CDX-M630, Sony XM-2165GTX, JL Audio 12W3D2, Planet Audio VX-602, Memphis 15-MC5.7
Yeah it's a mutt, but mutts make the best dogs!
Posted By: KarTuneMan
Date Posted: October 17, 2008 at 9:21 PM
If not down, then to the rear.
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