which direction to face a sub in a jeep?

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deegz97

Member - Posts: 21

Joined: June 30, 2008

Location: Missouri, United States

Posted: October 14, 2008 at 12:36 AM / IP Logged

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!

KarTuneMan

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Joined: December 14, 2004

Location: Isle Of Man

Posted: October 14, 2008 at 7:38 AM / IP Logged

Down..... if the sub will work properly down fired.

Someone here will post the formula for figuring this out!

whiterob

Copper - Posts: 351

Joined: July 22, 2007

Location: United States

Posted: October 14, 2008 at 10:56 PM / IP Logged

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.

mcben789

Copper - Posts: 171

Joined: October 01, 2007

Location: Mississippi, United States

Posted: October 15, 2008 at 5:18 PM / IP Logged

I have my Alpine facing the liftgate and it sounds fine.

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dangerranger96

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Joined: April 05, 2004

Location: United States

Posted: October 15, 2008 at 8:49 PM / IP Logged

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!

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whiterob

Copper - Posts: 351

Joined: July 22, 2007

Location: United States

Posted: October 15, 2008 at 10:47 PM / IP Logged

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.

KarTuneMan

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Joined: December 14, 2004

Location: Isle Of Man

Posted: October 15, 2008 at 10:51 PM / IP Logged

When you downfire a sub the sub will 'sag' due to gravity pushing down on the suspension.

Gravity does not push..... it pulls! which direction to face a sub in a jeep? -- posted image.

whiterob

Copper - Posts: 351

Joined: July 22, 2007

Location: United States

Posted: October 16, 2008 at 11:48 PM / IP Logged

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! which direction to face a sub in a jeep? -- posted image.

Lol, as soon as I wrote that I knew someone was going to call me on that. which direction to face a sub in a jeep? -- posted image.

dangerranger96

Copper - Posts: 163

Joined: April 05, 2004

Location: United States

Posted: October 17, 2008 at 8:07 PM / IP Logged

is xmax in metric or standard(US)

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!

dangerranger96

Copper - Posts: 163

Joined: April 05, 2004

Location: United States

Posted: October 17, 2008 at 8:10 PM / IP Logged

lets put it this way... I have a JL 12w3d2 and im trying to figure out whether this will work with this sub

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!

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