Sub Box Design - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > General Tech Forums > Communications and Electronics

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 12-29-2009, 11:00 PM   #1
Jeeper
 
Join Date: May 2009
Posts: 226
Sub Box Design

why is it that most boxes i see for the back of jeeps face down? Is that the best design for the small back space or is it better for elements or what?

jw

jwells36 is offline   Quote Quick Reply
Old 12-29-2009, 11:40 PM   #2
Jeeper
 
APPSTATEwrangler's Avatar
 
Join Date: Oct 2009
Location: High Point, NC
Posts: 575
im pretty sure that there is no performance difference in down-firing subs compared to other designs, but i do know that it is very important to protect the cone from physical damage and to keep other objects from resting on the cone during use.
and in jeeps, weather becomes a problem so that is another reason to face the sub toward the floor.

__________________
04 Forest Green Sport. 32" Geolander AT-S w/ spidertrax spacers , 2" Skyjacker spacer lift w/ Hydro Shocks, JKS quick discos, RR tube brush guard, 10" Memphis Sub w/ custom box under rear seat, RR seat covers, and a sh** ton of good ole' N. Carolina red clay.
APPSTATEwrangler is offline   Quote Quick Reply
Old 12-30-2009, 12:55 AM   #3
Show Me Your 8008135!

WF Supporting Member
 
s3nt3nc3d's Avatar
 
Join Date: Oct 2009
Location: Piqua, OH
Posts: 3,641
Send a message via AIM to s3nt3nc3d
For audiophiles I'm sure there's a slight difference whether the subs are down-firing, rear-firing, or forward-firing...but for the average joe, it's probably not going to make much of a difference. Down-firing may give a little more bump due to having the tub to bounce the sound waves off of as compared to a soft top with a rear-firing system.

I would think the biggest benefits of a down-firing system are as mentioned above...protects the sub from damage (both water, mud, sun, groceries, tools, etc), it also keeps would-be thieves guessing if you have subs there or if it's a custom console...and they have to decide whether its worth the risk to try stealing it in hopes that you have a valuable system and not a super cheap, rigged up setup.
__________________
"We don't build great brakes because we think you don't know how to drive, we build them for the guy on the road in front of you that doesn't." - Black Magic Brakes
s3nt3nc3d is offline   Quote Quick Reply
Old 12-30-2009, 10:05 AM   #4
Jeeper
 
Join Date: May 2009
Posts: 226
i am thinking about building a sub box for my tj and i was thinking about using 3/4 inch plywood and covering it with spray on bedliner. What do you think about that idea?

jw
jwells36 is offline   Quote Quick Reply
Old 12-30-2009, 10:22 AM   #5
Show Me Your 8008135!

WF Supporting Member
 
s3nt3nc3d's Avatar
 
Join Date: Oct 2009
Location: Piqua, OH
Posts: 3,641
Send a message via AIM to s3nt3nc3d
I would use a better wood, use either 1/2" or 3/4" MDF...and don't breathe the dust in while you're cutting it. I hear they can be pretty bad. My first sub box in my truck was similar to that though. 3/4" MDF with 2 down firing 6 1/2" subs all covered in black truck undercoating for durability.

I've actually heard of poorly constructed boxes (especially those using the wrong type of wood--such as certain woods with no flex to them under pressure) blowing up...that's why I suggested MDF which is what most box builders use.
__________________
"We don't build great brakes because we think you don't know how to drive, we build them for the guy on the road in front of you that doesn't." - Black Magic Brakes
s3nt3nc3d is offline   Quote Quick Reply
Old 12-30-2009, 10:32 AM   #6
Jeeper
 
Join Date: May 2009
Posts: 226
I always have used MDF but i was not sure how it will hold up if it got wet, that is why i was thinking about using plywood, it will hold up to moisture better. If the plywood is going to hinder performance then i will go with MDF and hope for the best.

jw
jwells36 is offline   Quote Quick Reply
Old 12-30-2009, 11:59 PM   #7
Show Me Your 8008135!

WF Supporting Member
 
s3nt3nc3d's Avatar
 
Join Date: Oct 2009
Location: Piqua, OH
Posts: 3,641
Send a message via AIM to s3nt3nc3d
Just seal that MDF well with the spray on bedliner and you should have no issues...
__________________
"We don't build great brakes because we think you don't know how to drive, we build them for the guy on the road in front of you that doesn't." - Black Magic Brakes
s3nt3nc3d is offline   Quote Quick Reply
Old 01-05-2010, 03:56 PM   #8
Newb
 
Join Date: Dec 2009
Posts: 7
if you take ur top off alot than down-firing is the best way and it sounds better what are the demensions of ur box as i am thinking about builing a sub box also
jeeperzcreeper is offline   Quote Quick Reply
Old 01-25-2010, 04:43 PM   #9
Jeeper
 
barratt's Avatar
 
Join Date: Jan 2010
Posts: 36
A down firing box or isobaric box are the best way to go for an open air application. Isobaric requires double the airspace so I would stick with a downfire box. Subwoofers need a surface to reflect off of to control suspension of the cone. Even with a downfire sub don't expect the same sound quality with the top down as with the top up. If you want big sound go with like a Kicker L5 or L7 and gobs of power. They require very little air space to perform well.
barratt is offline   Quote Quick Reply
Old 01-25-2010, 09:08 PM   #10
Jeeper
 
01 TJ's Avatar
 
Join Date: Jan 2009
Location: Trussville, AL
Posts: 109
What is the best prep method for mdf? does it need a rough sand for the truck bedliner or does it need to just be cleaned real well to apply? I'm building a box for a 10" Memphis 15-PR10D4 sub. I am going to fire it down but the angles are wierd so I will update as I build. The internal volume of the sub makes it different depending on which sub you choose.
__________________
Hold my beer! Buuurp!
01 TJ is offline   Quote Quick Reply
Old 01-25-2010, 09:33 PM   #11
Show Me Your 8008135!

WF Supporting Member
 
s3nt3nc3d's Avatar
 
Join Date: Oct 2009
Location: Piqua, OH
Posts: 3,641
Send a message via AIM to s3nt3nc3d
When we did it, we didn't do anything to prep it...it's not a perfectly smooth surface so I figured it'd adhere just fine. And it did. If you wanna ensure good adhesion...just sand it down a lil bit to rough it up some. I wouldn't do too much or you may need to use multiple coats to make it look good. lol
__________________
"We don't build great brakes because we think you don't know how to drive, we build them for the guy on the road in front of you that doesn't." - Black Magic Brakes
s3nt3nc3d is offline   Quote Quick Reply
Old 01-25-2010, 09:53 PM   #12
Jeeper
 
01 TJ's Avatar
 
Join Date: Jan 2009
Location: Trussville, AL
Posts: 109
s3nt3c3d,

do you have the dimensions of your sub box? Is your down firing? Just curious. Thanks!
__________________
Hold my beer! Buuurp!
01 TJ is offline   Quote Quick Reply
Old 01-27-2010, 02:33 AM   #13
Jeeper
 
Join Date: Jan 2010
Location: Greater Seattle Area
Posts: 109
I second the MDF recommendation. I used 3/4" MDF, construction adhesive in a tube and wood screws every 3" when I built my box, but then I didn't want to have to build it again. With two Eclipse Titanium 12"s and a JL Audio 1000 watt amp mounted to the box, it's a big struggle to load/unload with one person. Mine are facing downward with about a 3" lip on the bottom of the box to keep the cones well away from whatever it's resting on. Incredible sound. I didn't seal mine with anything but black primer, but then I make sure the top is on it when I have the box in it just for security and wouldn't want the amp to get wet either.
__________________
97 TJ 6cyl, 5speed 37" Krawlers on American Racing 17" wheels. (Beadlocks someday)
RE 5.5 Long arm, Currie 9" front and rear with ARB's, Warn hubs and axle shafts, CTM u-joints
Optima Dual Batteries, OR Fab roll cage, custom rock sliders, SMF shorty bumpers front and rear.
My Jeep Site: www.jeffsjeep.com
JeffsJeep is offline   Quote Quick Reply
Old 01-28-2010, 09:36 AM   #14
Jeeper
 
barratt's Avatar
 
Join Date: Jan 2010
Posts: 36
3/4" MDF for 12" subs.....1/2" MDF is fine for 8" or 10" subs.
barratt is offline   Quote Quick Reply
Old 01-28-2010, 11:57 PM   #15
Jeeper
 
holes's Avatar
 
Join Date: Jan 2010
Location: south east mn
Posts: 321
eBay sells a killer fiberglass sub box that is fitted perfectly for the back, and looks very good.
holes is offline   Quote Quick Reply
Old 01-29-2010, 08:11 AM   #16
Jeeper
 
barratt's Avatar
 
Join Date: Jan 2010
Posts: 36
Quote:
Originally Posted by holes View Post
eBay sells a killer fiberglass sub box that is fitted perfectly for the back, and looks very good.
Do you have a link? I couldn't find it.
barratt is offline   Quote Quick Reply
Old 12-16-2012, 11:36 AM   #17
Newb
 
Join Date: Dec 2012
Posts: 1
Here's my sub box.

Hey folks. I just built a box to go behind the back seat of my 2 door JK. I wanted a bit more bottom end out of the stereo but I'm happy with the rest of the stock system, so I didn't want to shop around for a replacement head unit. I did find a good deal on an Audison ZX2 amp. Here's a link to a used one in diymobileaudio.com forum It's a versatile little amp, can run stereo for 2 subs or as a mono block, it can receive nominal signal through RCA connectors from any head unit with sub outputs, but it also will receive higher voltage input from a speaker signal. Which is the main reason I went with this amp, I have tied into the speaker wire from the right speaker on the roll bar and fed the signal into the amp from there. I've built the box 10"x10"x10" to house a Kicker 8" short cage driver, and recessed the back wall of the box 2.5" so I could mount the amp in that space to protect the amp, while being able to easily remove the box when I need the extra space in the Jeep. I've used quick connectors for the power/ground and the speaker signal so I can easily unplug both connectors and pull the box out of the Jeep. Hope this is useful, this is my first post on this forum.



derksen42 is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Plz help me to decide, design and built my jeep,... Skoal Bandit TJ General Discussion Forum 12 04-20-2013 06:00 PM
93 shit hydraulic clutch design Macddg YJ General Discussion Forum 0 09-27-2009 09:12 PM
Forum design deverhart Off-Topic 27 04-22-2009 05:01 AM
New Liberty Design debruins Off-Topic 14 04-14-2007 07:14 PM
Design ideas??? Geeps TJ General Discussion Forum 65 03-23-2007 06:16 PM


logo carid shop wrangler parts carid fender flares custom wheels store avs deflectors at carid

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 02:39 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC