Sub for convertible - top open/closed - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

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 19th April 2005, 03:28 AM   #1
diyAudio Member
 
Join Date: Aug 2004
Location: IL
Default Sub for convertible - top open/closed

A friend asked me to build a subwoofer for his convertible. I think a sealed enclosure would be best, based off the type of music he likes, his bass preferences, and the space available. Now, I realize that the cabin of a car amplifies low bass frequencies, and the smaller the cabin, the higher of a frequency at which this starts. So this is even more dominate in a small convertible.

Now, my main question is, if I design the sub to sound good with the top closed, will I lose all my cabin gain bass when the top is opened? Is there any way I can remedy this?

Thanks in advance!

Reece
  Reply With Quote
Old 19th April 2005, 07:10 AM   #2
simon5 is offline simon5  Canada
diyAudio Member
 
Join Date: Nov 2004
Location: Québec, Québec
You will lose all cabin gain. You cannot remedy this.

It's a good idea to go sealed, so when you'll lose all cabin gain, it won't sound awful.
__________________
DIYaudio for President !
  Reply With Quote
Old 19th April 2005, 09:38 AM   #3
Stocker is offline Stocker  United States
diyAudio Member
 
Join Date: Dec 2003
Location: Austin
If you wanted a super-slick implementation, you could have your cake and eat it, too.

Top-down, make an eq curve that sounds good. LOTS of power and bass-boosting action.

Top-up, make the eq cut out and let cabin gain work for you.

Use a micro-switch or an existing switch for the car's sensor, whatever you can hide.

Of course, if it is a ragtop, you will have next to no cabin gain anyway due to the lossy nature of the top IIRC, so vented is the way, all the way.
__________________
Jesus loves you.
  Reply With Quote
Old 19th April 2005, 06:50 PM   #4
diyAudio Member
 
Join Date: Aug 2004
Location: IL
Quote:
Originally posted by Stocker
Of course, if it is a ragtop, you will have next to no cabin gain anyway due to the lossy nature of the top IIRC, so vented is the way, all the way.

Interesting. Sounds like something I should test. Does anyone have experience with cabin gain in ragtops?

Reece
  Reply With Quote
Old 19th April 2005, 09:19 PM   #5
RHosch is offline RHosch  United States
diyAudio Member
 
Join Date: Sep 2003
Location: SouthEast
Cabin gain in a ragtop will be almost nonexistant.
  Reply With Quote
Old 20th April 2005, 12:01 AM   #6
Stocker is offline Stocker  United States
diyAudio Member
 
Join Date: Dec 2003
Location: Austin
Cabin gain (or room gain) comes because the air in a volume is compressed. If you have flexible walls in your house or a cloth roof to a car, they will be (at least) very lossy, contributing "not much" to the low-bass output of a subwoofer.
__________________
Jesus loves you.
  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
Closed Cell Vs. Open Cell Foam-Which For Damping Loudspeakers? kelticwizard Multi-Way 25 10th July 2013 04:55 AM
use closed headphone open with current source amp? el`Ol Headphone Systems 1 21st November 2006 03:16 AM
closed sub -> open baffle ? hilbren Subwoofers 9 7th February 2006 06:25 PM
over-excursion damage (closed or open box) jonz Multi-Way 7 1st June 2004 02:19 AM
Opamp phase shift - open and closed loop. Circlotron Analogue Source 8 23rd April 2003 08:06 AM


New To Site? Need Help?

All times are GMT. The time now is 08:05 AM.


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