downfiring sub box, pros and cons?
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=75274
Printed Date: May 13, 2025 at 11:33 AM
Topic: downfiring sub box, pros and cons?
Posted By: 05colorado
Subject: downfiring sub box, pros and cons?
Date Posted: March 28, 2006 at 5:46 PM
this is a box for 2 rockford fosgate HX2 15's. ive decided to have the subs faced towards the floor, and the ports firing towards the seats. does anyone here know the pros & cons of that setup ------------- chrome...its whats for dinner
Replies:
Posted By: supradude
Date Posted: March 28, 2006 at 8:09 PM
It should be OK , just make sure you have enough clearance between the subs and floor. As far as how it'll sound, you'll have to try it facing different directions to see what sounds the best for your setup.
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'85 Toy
Posted By: stevdart
Date Posted: March 28, 2006 at 9:04 PM
Run them through the sag calculator to make sure they're suitable for downfiring. ------------- Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: 05colorado
Date Posted: March 29, 2006 at 4:23 AM
it said theyre 78% saggy & NOT suitable for downfiring
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chrome...its whats for dinner
Posted By: stevdart
Date Posted: March 29, 2006 at 6:30 AM
Something was entered wrong. Use mm for Xmax, not inches. https://www.mhsoft.nl/conv1.htm for conversions. I haven't seen very many drivers come up much higher than 5% saggy. ------------- Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: 05colorado
Date Posted: March 29, 2006 at 6:47 AM
thanks for that tip, its now 3% saggy, I didnt know to use MM instead of inches. thats awesome, i was afraid that i wasnt gunna be able to do that. a few of my friends think that doing it this way will make it sound waaayyyyy quieter. I say it makes no difference.
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chrome...its whats for dinner
Posted By: stevdart
Date Posted: March 29, 2006 at 7:07 AM
Good, it will be fine to use that way. BTW, there have been more than a few 12volt members who have quieted their friends with the end result!
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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: 05colorado
Date Posted: March 29, 2006 at 6:29 PM
how much space should I leave between the woofer and the floor of the cab ?
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chrome...its whats for dinner
Posted By: Aruman
Date Posted: March 29, 2006 at 7:46 PM
use this program for conversions, it's free and very good.
https://joshmadison.net/software/convert/
Posted By: stevdart
Date Posted: March 29, 2006 at 10:51 PM
05colorado wrote:
how much space should I leave between the woofer and the floor of the cab ?
You really just need to clear max excursion, but give it a little extra space if you can. Aruman, I downloaded that program, it's a good one. Thanks for the link! ------------- Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: 05colorado
Date Posted: March 30, 2006 at 2:49 AM
i also downloaded, thx for the link i was thinkin like 1-2". the area under the sub should vented as well right? like you wouldnt want to seal them off to the floor? ------------- chrome...its whats for dinner
Posted By: Aruman
Date Posted: March 30, 2006 at 4:40 AM
you're welcome 
Posted By: 05colorado
Date Posted: March 30, 2006 at 5:12 AM
ok so any last words of advise on this topic, its almost cutting time
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chrome...its whats for dinner
Posted By: 05colorado
Date Posted: March 31, 2006 at 1:52 AM
BUMP
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chrome...its whats for dinner
Posted By: ndm
Date Posted: March 31, 2006 at 3:03 PM
I say go for it...I did a 12w7 in a chevy dually op front ported...AWESOME!! it slams be prepared to adjust the distance it is from the floor though. I noticed it got louder as I gave it slightly more space...but I love downfiring/loading/cornerloading/boardloading....I am loading my 2 13w7's and its LOUD!!! and I played with the subs to get the best of all worlds....in a trunk..
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do it right the first time ....or do it again and again and again...
Posted By: kirktcashalini
Date Posted: March 31, 2006 at 3:43 PM
I left 2" even. once it sat tight on the carpet probly 1.5" works great i love it.
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99 Blazer LT. Yellow Top. Big 3. Infinity Kappa Speakers All Around. Jensen CD/DVD flip out. 2 Infinity Kappa Perfect 12DVQs powered by a Alpine PDX600.1 (in one custom box, building a FG box)
Posted By: 05colorado
Date Posted: March 31, 2006 at 4:38 PM
i'm thinkin i was gunna have the subs downfiring and the ports on the same plane as the subs, with about 2" in between the subs and the floor ------------- chrome...its whats for dinner
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