Replacing OEM JBL sub w/JL 8"

D

Dude

New member
Tried a search and cannot find a thread where someone replaced their OEM sub in the original JBL enclosure. Anyone tried this? I have an 03' limited with the 6disk-JBL setup. I'm thinking about a new Eclipse or Kenwood 2-din headunit, a JL 300/4 driving front components (front channels), the rear speakers driven by the HU, and bridging the rear channels of the 300/4 to drive a 8w3 stealth mounted in the OEM location. I'm thinking that if I can mount the amp under the passenger seat and get the sub in the OEM location, I don't sacrifice any space.

I also thought that depending upon volume of the OEM enclosure, I could remove the OEM and then fiberglass a custom piece to fit. Any thoughts on the volume of the OEM enclosure? Anyone fit a 2-din HU in the trim bezel for a 6-disk JBL setup? It seems from the Navi discussion, that there are some very slight differences in the trim for the Base stereo vs the JBL unit. Just curious if anyone has specifically installed the Eclipse or Kenwood unit in a JBL setup.
 
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OEM enclosure volume

According to a 4th gen information PDF that used to be (still is) floating around here, the factory sub enclosure is 17 liters, if I remember correctly.


wbs
 
wow....that's bigger than I thought. A JL 8w3v2 needs 8.5-14 for a sealed enclosure. I may need to look a a different sub or consider modifying the enclosure....maybe a 10W3v2???

I did a search for "PDF" and couldn't find the document that you referred to....can you remember the Topic for a more targeted search?
 
Last edited:
Other questions for the forum:

Any comments on the trim bezel when installing a 2-DIN headunit

Largest amp mounted under a passenger seat (MY03' and newer)

Any thoughts on fiberglassing over a semi-modified OEM enclosure??? I guess that is one way to retain a custom fit solution.....or should I just look at a completely custom fitting box.
 
I put my sub amp under the passenger seat, works fine there. Its not very big, still fits fine.

I also thought about putting an aftermarket sub in the factory location, and after tearing it apart I found the factory enclosure is very, very shallow. All the woofers I found that I'd want were too deep, and wouldn't fit. The enclosure wraps around back a bit, which is why it has so much volume, but it fits in such a shallow space that an aftermarket sub will be very tight in there.
 
OEM enclosure volume

The article used to be in a sticky thread in the General forum. The document as a whole, was promoting all of the new features and options of the 4th Gens. It may have even been a link to a toyota site containing the file. The document I'm remembering may have even been something aimed to inform the dealerships about the new model...it's probably been almost a year since I looked at it. Maybe a moderator remembers...

I wouldn't let 3 liters put you off if you like the driver. If you're really concerned, download a speaker modelling tool like this and enter the T/S parameters for your driver...
http://www.linearteam.dk/default.aspx?download=winisdpro If you do this, don't be discouraged by the performance numbers you see...their simulations of anechoic conditions, room/cabin gain is a discussion too big for this thread...just use the tool to see the difference between various net enclosure volumes. More than likely, the 17 liters is gross volume, anyway. The backside structure and cone of the driver will probably eat up at least a liter from your gross. Just for fun, you could also play with putting solid objects into the enclosure to consume volume...essentially, tune the enclosure to what sounds best to you. Like Vortec said, your biggest issue may be available depth...don't know, haven't looked. There's a thread somewhere on here giving instructions on how to get to the enclosure...that person may have some measurements you could use.

wbs
 
thanks for the input. I found one post that mentioned a slightly less than 4" depth....a JL 8w3v2 is just over 4"

I may still be able to get it to fit with a spacer ring...now I'm wondering if there is any space behind the OEM enclosure. If there is, I should be able to fab a custom box. Maybe it is time to dismantle the area.
 
JL 8w3v2-d2 response comparison

OK,

went ahead and ran the numbers for you.

8.6 liters vs. 16 liters (JL quotes .99 l displacement for the driver)

The 3db down point stays the same. The larger enclosure yields a shallower rolloff slope actually resulting in about 2db more output an octave below the -3 point, assuming you're driving each enclosure with the same power and remain inside of their respective power handling limits. However, the larger volume reduces your overall power handling. In theory, the 8.6l enclosure can take the full 125 watts at any frequency...the 16l reaches the driver's limits at 115 watts one octave below -3, and down around 88 watts at 2 octaves below.

I'd call it close enough to not worry about it. If I remember my rule-of-thumb cabin gain correction correctly, the 16l enclosure should still produce around 105 dbs @ 20hz. I'm usually completely happy with my home theater hitting 95db peaks...anything louder just starts to be painful...but, I could just be getting older. :-)


wbs
 
I've been trying to find a way to do this since I bought the truck. You said it's a 4" depth? Don't know what kind of sub would fit in that. Anyone have any experience with the shallow mount subs?
 
jay_marx said:
I've been trying to find a way to do this since I bought the truck. You said it's a 4" depth? Don't know what kind of sub would fit in that. Anyone have any experience with the shallow mount subs?
Click to expand...

I've always been a JL fan and only want some fill vs. big booming bass. The 8W3v2 is 4.31" deep....I just assume that I could find a 1/2-1" somewhere....either a spacer or custom fab a box that is a bit deeper assuming that there is a bit of space between the OEM box and the body. I was hoping that someone else had looked at this before I purchased a sub and found out it wouldn't work.

I guess as a last resort, I either find a shallow mount solution or fab a box in the cargo area. Have you found any other subs?
 
jay_marx said:
I've seen a lot about RE's subs... they do have a 8. Waiting on a response from the as to the mounting depth.

www.reaudio.com
Click to expand...

I've been a fan of Resonant Engineering stuff for a long time, although I have a feeling it would be too deep.

High quality woofers though!
 
Re: another driver choice

riverwolf said:
Looking for a drop in replacement and assuming the available OEM mounting depth is truly only 4"...you might check this one out: http://www.adireaudio.com/TextPages/Koda8PageFrameText.htm The in cabin response with only 1 watt of input looks pretty amazing.

wbs
Click to expand...

If you look at woofer specs and see sensitivity - usually around 80 - 100db - that's the output with a 1 watt signal. For example my Perfect's sensitivity is 94db meaning with 1 watt of power it creats 94db of sound. My old woofer was only 90db, and because of the way decibels are measured (exponentially) this was a huge jump.
 
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