What are the subwoofer boxes with the horns about? - diyAudio
Go Back   Home > Forums > General Interest > Car Audio

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 16th June 2011, 03:57 AM   #1
diyAudio Member
 
Bumpin 86 Caddy's Avatar
 
Join Date: Mar 2011
Location: Cincinnati, OH
Default What are the subwoofer boxes with the horns about?

Just wondering if anyone knows about the sub enclosures with the big round tubes comming off it are called. and do they help a lot. Are they just for burps at competitions?
__________________
1 Juggernaut 15" -- JL Audio 500/1 V2
Kenwood Hean Unit -- Big 3 Upgrade 0/1 Gauge
  Reply With Quote
Old 16th June 2011, 05:21 AM   #2
diyAudio Member
 
picowallspeaker's Avatar
 
Join Date: Apr 2007
...maybe 'exponential vents' ?
  Reply With Quote
Old 16th June 2011, 06:35 AM   #3
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Are they, in general, straight tubes with flared ends or does the port change diameter along its entire length?
  Reply With Quote
Old 16th June 2011, 10:28 AM   #4
diyAudio Member
 
Patrick Bateman's Avatar
 
Join Date: Oct 2006
Location: San Diego
Quote:
Originally Posted by Bumpin 86 Caddy View Post
Just wondering if anyone knows about the sub enclosures with the big round tubes comming off it are called. and do they help a lot. Are they just for burps at competitions?
Back in the 80s and the 90s you needed two or three cubic feet of airspace for a twelve inch driver. As time progressed, people wanted woofers that worked in smaller and smaller boxes. At this point, you can easily find twelves that will work in a half a cubic foot, or even a quarter of a cubic foot.

That creates a problem though. As the box gets smaller, the vent gets BIGGER.

That's why we're seeing a lot of boxes with these outlandish looking vents. It's because we're getting to a point where the vent is bigger than the box itself!

An obvious solution would be to use a smaller vent, but this isn't a good option, because vent efficiency and vent size are tied together. So if you want an efficient vent, it needs to be big.

Taken to the extreme, you end up with a tapped horn, which is basically a vented box with a very large vent and no back chamber at all.

Hope that helps. I've written a ton of posts on this at forum.audiopsychosis.com

  Reply With Quote
Old 16th June 2011, 11:54 AM   #5
Cr@sh is offline Cr@sh  United States
diyAudio Member
 
Join Date: Aug 2009
Location: Detroit
There most likely aeroports and there used to get maximum use of small air spaces. This way a guy can enter the class A amateur spl for one woofer or two and with four or more amps (Depending on how many voice coils) they tune the boxes up to 80hz and do very high spl with them.Click the image to open in full size.
  Reply With Quote
Old 16th June 2011, 11:55 AM   #6
Cr@sh is offline Cr@sh  United States
diyAudio Member
 
Join Date: Aug 2009
Location: Detroit
This guy (Jacob Fuller, owner of Sundown audio) does some impressive numbers with them. 150.2 "Outlaw" - Single 8" Woofer - DIYMA.com - Scientific Car Audio - Truth in Sound Quality
  Reply With Quote
Old 17th June 2011, 01:12 AM   #7
diyAudio Member
 
Bumpin 86 Caddy's Avatar
 
Join Date: Mar 2011
Location: Cincinnati, OH
Are they just for use in small cars? If you had plenty of space would these be better than a large ported box?
__________________
1 Juggernaut 15" -- JL Audio 500/1 V2
Kenwood Hean Unit -- Big 3 Upgrade 0/1 Gauge
  Reply With Quote
Old 17th June 2011, 01:19 AM   #8
diyAudio Member
 
Bumpin 86 Caddy's Avatar
 
Join Date: Mar 2011
Location: Cincinnati, OH
Also ive seen encolsures with the aeroports on the inside of the box with just the opening showing. and ive seen them with the whole tube on the outside of the box. Which is "better"?
__________________
1 Juggernaut 15" -- JL Audio 500/1 V2
Kenwood Hean Unit -- Big 3 Upgrade 0/1 Gauge
  Reply With Quote
Old 17th June 2011, 03:21 AM   #9
Cr@sh is offline Cr@sh  United States
diyAudio Member
 
Join Date: Aug 2009
Location: Detroit
Well keep in mind that if a port measures 10 inches long and is 4" diameter it will take up that much space in the enclosure and should be accounted for when calculating displacement. It depends on what your looking for in performance. If you want spl or higher decibels they seem to have an advantage when it comes to port turbulence which in the spl world can cause loss of decibels. Although proper port etiquette for me at least is to round over all the edges of any port round or square.
  Reply With Quote
Old 17th June 2011, 11:14 PM   #10
Jexx is offline Jexx  United States
diyAudio Member
 
Join Date: Jun 2006
Send a message via MSN to Jexx
Interesting, I've never heard it from this perspective before.

I was under the impression the ports were mostly for more SPL and as a result loose some sound quality over a sealed enclosure.

Speaking of which, I think the funniest things I've seen are when they put the tweeters, even mids, on subwoofer boxes for cars. What's the point in that? They're usually in the trunk or in the rear and would either be useless or destroy the sound image.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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
smith horns and using compression horns for a Karlson party speaker project bikehorn Multi-Way 14 30th January 2013 06:20 PM
Horns inside of horns open foe discussion oilcanracer Multi-Way 3 15th February 2010 04:42 AM
Need some opinions for alternate boxes for TC2+ 15" subwoofer boogs Subwoofers 0 8th August 2006 06:23 PM
Subwoofer Boxes!!!!!!!!!!!!!! jahl Car Audio 9 7th July 2003 08:31 AM
Damping for subwoofer boxes Alchemist Subwoofers 3 27th October 2001 04:46 PM


New To Site? Need Help?

All times are GMT. The time now is 05:20 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2