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Old 01-10-2021, 10:27 AM   #1
ItWillBeSlow
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Sub box behind seat - available space?

Currently planning out my audio components and have everything figured out except what sub I want to use..

I am going for a single 10" or single 8" sub, and would prefer a JL W3 (8W3V3 or 10W3V3 ideally). The 10" W3 requires 6" mounting depth according to JL, not counting the space in front of the box required to keep the cone from hitting the seat.

I cant find any actual dimensions of how much available space is behind a factory bench seat, pushed all the way back. I am planning a basic triangular box and can make it long if needed to get the volume. I don't know if this depth is an option or not. I want to build something similar to @SactoJim from this post: http://67-72chevytrucks.com/vboard/s...58&postcount=3

If anyone has dimensions from the back of a fully extended bench to the rear cab, please share. I cant get my set in for a while to check this myself. If you have any similar "basic" triangular single sub boxes behind your seat please share as well.

Thanks!
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Old 01-11-2021, 01:57 AM   #2
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Re: Sub box behind seat - available space?

You did not say, but if you are keeping the in cab fuel tank, you are not fitting that deep basket sub in the truck.
The truck tank is about 9" deep at the bottom, and gets to about 5" at top. (off the top of my head, measure yours )
With seat all the way back, the seat bottom is maybe 3" from tank, top of seat is 1" (again ball park)
remember that the JL sub vents the voice coil motor in the magnet /speaker back. So you need a little space between the box back and the back of sub.
6 deep sub +1/4" for the motor vent, and then the box wood thickness x2(front panel and rear) So for example. 3/4" mdf x2 is 1.5"
7" (sub)+ mdf x2 1.5" you are at ,at least 8.5" + the subs mounting flange and air space for cone movement.
Totally forget it if keeping the in cab fuel tank.
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Old 01-11-2021, 08:40 AM   #3
ItWillBeSlow
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Re: Sub box behind seat - available space?

Thanks for the reply. Gas tank is gone.

According to your estimates, it theoretically should work. Your ballpark says ~12" from back of cab to seat, with about ~10"-11" needed for the sub and cone movement.

I do have the tank out and can verify that depth, I just cant get my seat in to see where it would sit.

Any other comments and experience appreciated!
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Old 01-11-2021, 10:22 AM   #4
1971Stepside
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Re: Sub box behind seat - available space?

I did the single 10" JL sub, but went with the shallow version. I posted a couple pics in my build thread and above in the pinned custom stereo thread. It sounds great and doesn't touch the seat
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Old 01-11-2021, 09:08 PM   #5
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Re: Sub box behind seat - available space?

Quote:
Originally Posted by 1971Stepside View Post
I did the single 10" JL sub, but went with the shallow version. I posted a couple pics in my build thread and above in the pinned custom stereo thread. It sounds great and doesn't touch the seat
That looks great, thanks for the reply. I looked into the JL TW subs just now and they look like a great option for me as well.

How deep is your box at the bottom? Is your seat all the way back? What are you going to cover your enclosure with?

I like the simplicity of what you did, something like that is what I am after. I am thinking I will offset the sub to have as much storage on one side as possible.
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Old 01-11-2021, 11:50 PM   #6
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Re: Sub box behind seat - available space?

An other option for you as you are using a bench seat.
Is build a box that goes under the seat and put 2 shallow subs in it, one on each side, with a divider in the middle of the box.
subs firing down at floor, and 3 sides of box 1" taller than the front of the box(sides and back )
This way when you put the box in, and subs are pointing toward the floor, The longer sides and back, hold the subs off the floor, and the front of the box (facing the foot wells) has a 1" tall, full length of the box slot for the sound to come out of.
Think of it this way,( as I doubt what I typed above makes any sense without a photo.)
You build the box to fit under seat with say, 4'x14"x4.5" . Then you screw/glue 1"x1" stock on the box face (panel the sub(s) are mounted to, bottom, and sides.
now the box goes under seat subs facing down, and because 3 sides have that 1"x1" the 4th side is a nice long slot for the sound waves to exit from.
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Old 01-12-2021, 01:42 PM   #7
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Re: Sub box behind seat - available space?

Quote:
That looks great, thanks for the reply. I looked into the JL TW subs just now and they look like a great option for me as well.

How deep is your box at the bottom? Is your seat all the way back? What are you going to cover your enclosure with?

I like the simplicity of what you did, something like that is what I am after. I am thinking I will offset the sub to have as much storage on one side as possible.
Box is 6" at the bottom and my seat goes all the way back. I'm using a Snowden Seat, but that will be very similar to the factory seat. It will be covered with red vinyl like the seat etc. I put my amp on the passenger side and will keep the drivers side for some storage of window cleaner etc.
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1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3000 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Other toys always push it aside, but one day....one fine day, she will be back on the road.

www.paypal.me/Cape505

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Old 01-21-2021, 06:55 PM   #8
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Re: Sub box behind seat - available space?

Looks good 71SS.

I am working on my system as I install the interior.
Here is the speakers and box I built last year.
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Old 02-22-2021, 06:54 PM   #9
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Re: Sub box behind seat - available space?

Here is my box completed!
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1956 Chevy Bel Air 2 door
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1970 K20 LWB project the Hulk build w/Supercharged 4.8L-ly2/4L60E HULK BUILD
1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E
1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR *SOLD*
GO GO!!!
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Old 02-23-2021, 11:24 PM   #10
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Re: Sub box behind seat - available space?

Quote:
Originally Posted by First c10 View Post
Here is my box completed!
That looks fantastic. What is the box covered with? Did you do it all yourself? What paint color is that?

Thanks for sharing
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Old 02-24-2021, 02:09 AM   #11
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Re: Sub box behind seat - available space?

Quote:
Originally Posted by ItWillBeSlow View Post
That looks fantastic. What is the box covered with? Did you do it all yourself? What paint color is that?

Thanks for sharing
Thank you!
The box is covered with high grade vinyl. It’s so good I have a hard time telling the difference from it and the leather. The smell give it away.

I didn’t do the upholstery but did cover some of the wood parts myself. The tough pieces I had my upholstery guy do.
Check out my build thread it has more pictures of the stereo and interior.
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1956 Chevy Bel Air 2 door
1956 Chevy 210 4 Door
1970 K20 LWB project the Hulk build w/Supercharged 4.8L-ly2/4L60E HULK BUILD
1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E
1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR *SOLD*
GO GO!!!
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Old 02-26-2021, 10:17 PM   #12
ItWillBeSlow
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Re: Sub box behind seat - available space?

Quote:
Originally Posted by First c10 View Post
Thank you!
The box is covered with high grade vinyl. Itís so good I have a hard time telling the difference from it and the leather. The smell give it away.

I didnít do the upholstery but did cover some of the wood parts myself. The tough pieces I had my upholstery guy do.
Check out my build thread it has more pictures of the stereo and interior.
Very very cool, thanks for sharing.
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