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Old 04-01-2013, 09:14 PM   #1
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OEM sub enclosure

Does anyone know the volume of the factory enclosure for a 2008 infinity sub? I am doing an upgrade and looking for aftermarket subs. I plan on using the Alpine PDX-V9 amp.

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Old 04-01-2013, 10:19 PM   #2
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0.3 cu ft I believe.

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Old 04-02-2013, 06:51 AM   #3
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Thanks thats about what I thought. Anyone have recommendations on a good sub that will fit that?
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Old 04-02-2013, 07:33 AM   #4
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I'm planning to use the Kenwood Excelon 8" after having it recommended by a couple of other people.
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Old 04-02-2013, 08:03 AM   #5
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Old 04-02-2013, 09:20 AM   #6
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Will changing the sub out have that big of an impact without upgrading the amp?
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Old 04-02-2013, 09:30 AM   #7
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I'm no EE, but i'm pretty sure the sub's ohm rating (resistance) is different than the amp's resistance, and speaking for that JL audio sub i mentioned above, it might require thicker gage wiring...either way, i'll be replacing the factory amp.
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Old 04-02-2013, 09:55 AM   #8
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Originally Posted by Greg_2012_JKU View Post
Will changing the sub out have that big of an impact without upgrading the amp?
Upgrading the sub without adding an amp won't do a lot of good. It's very simple to add a mono amp for the sub that accepts speaker level input and has an auto-turn on feature...just tap into the sub wires, run power and ground and a larger gauge wire to the sub enclosure. I'm blown away at the difference a sub/amp combo made in my 2013.
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Old 04-02-2013, 10:00 AM   #9
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Upgrading the sub without adding an amp won't do a lot of good. It's very simple to add a mono amp for the sub that accepts speaker level input and has an auto-turn on feature...just tap into the sub wires, run power and ground and a larger gauge wire to the sub enclosure. I'm blown away at the difference a sub/amp combo made in my 2013.
What combo did you go with?
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Old 04-02-2013, 11:29 AM   #10
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What combo did you go with?
Polk MM840D sub and a jbl mono amp...I think it's the 501ez. There's quite a bit of info on the install on page 2 of my "build" thread. Just click on the link in my signature.
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Old 04-02-2013, 12:13 PM   #11
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Just get a New Enclosure.

Plastic isn't exactly the Optimal Material to have for a Sub Enclosure.
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Old 04-02-2013, 01:09 PM   #12
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Polk MM840D sub and a jbl mono amp...I think it's the 501ez. There's quite a bit of info on the install on page 2 of my "build" thread. Just click on the link in my signature.
That is the exact amp I'm planning to use as well. One question though, why not mount the Polk the way the stocker is mounted and just drill some new holes? Did you just feel like the Polk was too heavy to be secured that way? Also, how is the heat on that amp, any issues?
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Old 04-02-2013, 01:17 PM   #13
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Originally Posted by Duramaxxed View Post
Just get a New Enclosure.

Plastic isn't exactly the Optimal Material to have for a Sub Enclosure.
Got pics?
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Old 04-02-2013, 03:32 PM   #14
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That is the exact amp I'm planning to use as well. One question though, why not mount the Polk the way the stocker is mounted and just drill some new holes? Did you just feel like the Polk was too heavy to be secured that way? Also, how is the heat on that amp, any issues?

Yes, the Polk would have been way too heavy. The stock sub mounting points are reinforced but do not line up with the holes in the Polk (6 vs 8 holes). Simply drilling through the plastic would have left the sub attached to only the thinner sections of plastic...and there was no way to attach a nut or anything on the inside of the enclosure once the sub was in. I considered molly screws but still didn't think it would be very secure. I attached my home-made adapter ring with the original screws at the reinforced points, then used deck screws to attach the sub to the 1/2-inch plywood adapter. It's bombproof.

I was skeptical about how it would sound in the plastic enclosure...which is one reason I covered virtually the entire inside of the enclosure with Dyna-Mat. Others said they had rattling problems. I do not, probably because of all the Dyna-Mat. I wanted to use the stock enclosure because I have better things to do with the space in the Jeep than use it for mounting sound equipment.

As for the heat from the amp, no issues whatsoever. I've mounted it under the passenger seat...plenty of ventilation.
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Old 04-02-2013, 03:39 PM   #15
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Moabite, how much Dynamat did it take? I'm going to order my sub soon and I think that Dynamat's a good idea, but that stuff's seriously expensive. Will a couple of 10" x 10" sheets be enough?
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Old 04-02-2013, 03:45 PM   #16
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Originally Posted by Moabite View Post
Yes, the Polk would have been way too heavy. The stock sub mounting points are reinforced but do not line up with the holes in the Polk (6 vs 8 holes). Simply drilling through the plastic would have left the sub attached to only the thinner sections of plastic...and there was no way to attach a nut or anything on the inside of the enclosure once the sub was in. I considered molly screws but still didn't think it would be very secure. I attached my home-made adapter ring with the original screws at the reinforced points, then used deck screws to attach the sub to the 1/2-inch plywood adapter. It's bombproof.

I was skeptical about how it would sound in the plastic enclosure...which is one reason I covered virtually the entire inside of the enclosure with Dyna-Mat. Others said they had rattling problems. I do not, probably because of all the Dyna-Mat. I wanted to use the stock enclosure because I have better things to do with the space in the Jeep than use it for mounting sound equipment.

As for the heat from the amp, no issues whatsoever. I've mounted it under the passenger seat...plenty of ventilation.
Gothcha, that makes perfect sense. I don't have my JK yet so I had no idea but I figured it had something to do with that. Thanks
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Old 04-02-2013, 03:52 PM   #17
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Moabite, how much Dynamat did it take? I'm going to order my sub soon and I think that Dynamat's a good idea, but that stuff's seriously expensive. Will a couple of 10" x 10" sheets be enough?
I ordered 2 Dynamat 10415 Extreme Speaker kits from Crutchfield. Each package had two 10x10 sheets. I used one package and most of a 3rd sheet. I think I still have enough left to use some in the dash and soundbar enclosures.

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