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Discussion Starter #1
I'm looking at replacing the rear 6x9's with dedicated 6.5" subs. I haven't pulled my seats apart to measure anything yet, so does anybody know the rough enclosure volume and port length/diameter? I originally wanted to look into the JL 6W3v3, but the mounting depth has me concerned. It might have to be something shallower like the Skar EVL-65. Finding the volume of the enclosure will help me narrow down my choices if it is even a good idea.

This is on a 1992 3000GT VR4. I searched around and could not find the answer.
 

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Remove the enclose, seal the inside of the port and the mounting hole, fill it with water then measure the water. I haven't seen a volume published for it.

Personally I'd stick with a quality 6x9 due to the small volume (even before displacement) and lack of rigidity. There's also only 3" of mounting depth.
 

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For the mounting depth, i recall from many years ago when i replaced the rear 6x9 speakers that i had to cut the port/tube that protrudes into the speaker enclosure because the magnet from the aftermarket speakers was much larger than stock (e.g., aftermarket speaker was "deeper"). This was a simple fix however - i just had to cut part of the plastic tube and the new speakers cleared without a problem
 

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Discussion Starter #4
Remove the enclose, seal the inside of the port and the mounting hole, fill it with water then measure the water. I haven't seen a volume published for it.

Personally I'd stick with a quality 6x9 due to the small volume (even before displacement) and lack of rigidity. There's also only 3" of mounting depth.
I was hoping to get a measurement before I ripped everything apart and then have to decide what to use with the panels apart, but your method will certainly work. If I do go that route, I'll report back on the volume. There certainly is a question about rigidity, but I will have to see what options I have there once I get in there. I know it is a small volume, but there are a good amount of small 6.5" subs out there that do not require much volume. Finding that actual mounting depth is a key parameter to limit my choices down. My ideal sub to put in there is a JL 6W3v3 as it only needs .15 ft^3 sealed, but the mounting depth is pretty deep at 4.25." Moving to something like the skar evl-65 drops the mouting depth to 3.5", but sealed box goes up to 0.25 ft^3. The shallowest option is the earthquake SWS 6.5X with 1.8125" mounting depth and 0.2-0.4 ft^3 sealed.

I like the dedicated sub instead of a 6x9 because I was going to completely remove the rear fill otherwise.


For the mounting depth, i recall from many years ago when i replaced the rear 6x9 speakers that i had to cut the port/tube that protrudes into the speaker enclosure because the magnet from the aftermarket speakers was much larger than stock (e.g., aftermarket speaker was "deeper"). This was a simple fix however - i just had to cut part of the plastic tube and the new speakers cleared without a problem
I think if the volume of the enclosure is small, I would have to remove the port all together. I doubt it has the volume to support a port of any kind as ported enclosures need more volume compared to their sealed counterparts. Cutting the port changes its characteristics also, so I again would probably just go sealed unless the volume and port characteristics happen to line up with a speaker I can find.

Thanks for the input!
 

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One other consideration is excursion and how much clearance there is between the enclosure and the panel. I can't think of a good way to check this off the top of my head. You may be limited to a flush mount setup cutting into the net volume further.

Just to give you another option, Kicker has a 6.75" shallow mount that may fit. Depth is 2.75" cutout is 5.625 and min sealed volume is 0.18 cubes.
 

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Discussion Starter #6
One other consideration is excursion and how much clearance there is between the enclosure and the panel. I can't think of a good way to check this off the top of my head. You may be limited to a flush mount setup cutting into the net volume further.

Just to give you another option, Kicker has a 6.75" shallow mount that may fit. Depth is 2.75" cutout is 5.625 and min sealed volume is 0.18 cubes.
Yep, I realize those limitations. The first one I had is if the volume is even close so I'll start there.

For no particular reason, I'm just not a big kicker fan.
 

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For no particular reason, I'm just not a big kicker fan.
I figured that would be the case considering your ideal driver is a W3.

After looking at a number of pictures and estimating the dimensions, the internal volume should be in the ballpark of 0.12 cubes before displacement. 0.14 best case scenario.

The last pic here gives a pretty good idea of the face dimensions.
Stealth 316 - Speakers
 
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