WTB 8" Under the dash custom Subwoofer Box (Page 4/22)
Austrian Import OCT 30, 01:57 AM
Black Pegasus, that's okay. That's exactly what I wanted to hear. I had no idea how big your box was, so I was guessing it was near 1 cubic foot. Guess I overestimated from the picture.
CDubbz88GT OCT 30, 04:53 AM
That JL is an amazing sub, but is very heavy, and requires a GOOD amplifier, not a cheapo, and if you can, you aught to try to make the enclosure capable of holding the JL 8w7, I'd buy two
Macs86GT OCT 30, 11:56 AM
Might i recommend the kicker comp vr 8 dvc i have one in an under dash enclosure and it can carry some serious bass for an 8.
Austrian Import NOV 01, 05:22 PM

quote
Originally posted by CDubbz88GT:

That JL is an amazing sub, but is very heavy, and requires a GOOD amplifier, not a cheapo, and if you can, you aught to try to make the enclosure capable of holding the JL 8w7, I'd buy two



Could you tell me a bit about that subwoofer? I see it has a HUGE following on the internet, but it's very light on information.
What makes it so special?

And a general question: How does a high end 8" compare to a medium end 10", or a low end 12" sub.
Macs86GT NOV 02, 11:23 AM
high end 8 will sound cleaner and be able to carry as much wattage as a low end 10 or 12 if not more and still sound better. Loudness one thing clarity is another thing all together. The problem with that speaker in an under dash set up is the weight of the speaker and air volume required for it to operate, That 8 probably tips the scales at near 20 lbs and I would hazard a guess that it requires at least 2+ cf of airspace to function properly. There are shallow mount options that are lighter and require less volume in the box, The big thing to look at is frequency range, wattage peak and wattage RMS and is the speaker dual voice coil vs single voice coil. Dual voice coils tend to hit much harder due to the design.

[This message has been edited by Macs86GT (edited 11-02-2009).]

Black Pegasus NOV 02, 01:11 PM
EDITED: I've posted before seing the post of Macs86GT (By the way, you are right Macs86GT)

The problem with the JL Audio 8W7 subwoofer, I don't think it would be fitting it. I think there is a way possible to fit it in the enclosure. Physically, I think (I'm not a 100% sure though) that this subwoofer will fit with some modification to the enclosure. The only problem I could see though is the air volume required by that subwoofer.

I have an enclosure able to contain about 0.3 cubic feet. But this subwoofer require 0.875 cubic feet to work in it optimum performance. This mean, even if the subwoofer fits in the enclosure, he is missing 0.575 cubic feet of air to work with. This means the music notes won't sound like it should or as loud as it should. I can't make the enclosure bigger (As you can see in the pictures) because I'm already using the maximum space available under the dash.

In other word:
-This subwoofer might fit if we work on the enclosure a little more.
-The weight won't be a problem if we design some kind of a metal bracket to support the enclosure and the subwoofer.
-The enclosure does not meet the requirements of the subwoofer: Thus you will need an extremely more powerful amplifier to run it.

Fred

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87 Pontiac Fiero GT

[This message has been edited by Black Pegasus (edited 11-02-2009).]

Austrian Import NOV 02, 04:13 PM
Black Pegasus, how much would the enclosure stick out to get the minimum box requirement? Or even 1 cubic foot?

I'm not dead set on any single subwoofer yet, but I have to admit, I'm in awe of what the 8w7 can do. http://www.audiogearreviews...iew-JL_Audio_8W7.asp (click through to page 2 for thorough review)
It's a couple of years old though, isn't there any other subwoofer that comes near those specs?

Also, how do you amp it at 3ohm? I've only seen 2ohm and 4ohm amps before.
Black Pegasus NOV 02, 06:38 PM
I'm afraid this subwoofer can not be made to fit under the dash. The only way possible to make a subwoofer enclosure big enough is by:
-Make some modification to the air duck work. (For the heater of the car)
-Fit an other (Or custom) dash.
-Make the enclosure go down even more until it reaches the floor of the car.

I am honnestly clueless about this one. Honnestly, I would like it to work (I would get myself one too) but I just don't see how we can pass the fact that it's missing some drastic air volume within the enclosure.

Fred

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87 Pontiac Fiero GT

Austrian Import NOV 03, 02:24 PM
Black Pegasus, could you modify the air duct flap to take up less volume? (the one where you already removed the mounting bracket) Or make it curve so it lets the speaker have more room?
How much more with would you need to get the extra .5 cubic feet?
Black Pegasus NOV 03, 06:00 PM
Modifying the air duct flap in possible but complicated. The less it takes place, the less air will go into the air conditionning and all this stuff. I don't think I will gain much more air volume within the enclosure by doing this. Just to give you an idea on how much more I need, the photo shows a 0.3 cubic feet enclosure. This mean, I need an enclosure at least twice bigger! This is a lot of place...

It's quite tough to make a great sound system in a Fiero because the space is very limited.

I honnestly don't know how to make this enclosure big enough..

Fred

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87 Pontiac Fiero GT