Adjust Cubic Air Volume? - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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 11th February 2016, 02:42 AM   #1
diyAudio Member
 
Join Date: Feb 2016
Default Adjust Cubic Air Volume?

Hello all! This is my first post to this forum and I should also say I'm not an audiophile by any definition so don't get too technical on me. I bought a new truck with a regular cab and the sound system is terrible so I have decided to add two subwoofers to a professional prefabricated box to place behind the seats. The box fits nicely and looks great and I really want to use it. However, the subwoofers that I want to use have a recommended .35 to .7 cubic air volume inside each chamber. According to the manufacturer, the box chambers are .77 cubic feet of air. What can I do, or should do if anything, to get the cubic air space down to somewhere between .35 and .7 (.55?)? When I get all my equipment in, I plan to take it to a professional car stereo installer and have them hook up everything. I've never used a professional car audio installer before so can they adjust (tune) the cubic air volume of my box for me? Maybe I'm worry about something that is not a real issue but I don't know how significant .7 over the recommended cubic air volume is and how, if any, it affects speaker performance. I hate to go to all this expense and effort and have some simple matter that might significantly affect the performance of my equipment. I would appreciate any advice on this matter. Thanks in advance!
  Reply With Quote
Old 11th February 2016, 02:55 AM   #2
Ron E is online now Ron E  United States
diyAudio Member
 
Ron E's Avatar
 
Join Date: Jun 2002
Location: USA, MN
holy wall of text batman!
0.77 will work fine, don't worry about it, don't bother trying to reduce volume as extra volume won't hurt.
__________________
Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan
Armaments, universal debt, and planned obsolescence--those are the three pillars of Western prosperity. Aldous Huxley
  Reply With Quote
Old 11th February 2016, 02:57 AM   #3
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Without knowing all the particulars, i.e. driver, box, specs and whether or not this 'system' has been optimized for your truck, I recommend leaving it at this ~10% too large since historically, typical mobile audio cab alignments ideally need larger cabs. Worst case, you can glue in wood scraps or similar to reduce its net Vb [internal cab volume], but I would be very surprised if you could hear any obvious difference since our hearing acuity down in the [sub] bass is very poor.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 11th February 2016, 03:09 AM   #4
diyAudio Member
 
Join Date: Jan 2016
Location: Omaha, NE
Are these sealed or ported boxes? Either way add some poly fill for damping. If they are ported leave the damping away from the port by about 4-5 inches. Don't worry about the extra volume (or get a bigger speaker). Your installer will know what to do, don't worry about it. Your not going to want to stop with the subs. A new head unit and front speakers will help out tremendously. Of course you will need the proper amps too. Enjoy!
  Reply With Quote
Old 11th February 2016, 04:31 AM   #5
diyAudio Member
 
Join Date: Apr 2010
Location: Utah
Hi Keith,

I totally agree with Ron and GM. By the time you subtract the driver displacement you should be close to .7cuft with it mounted in the box. For car audio, if I have the space to build the box bigger I will always build bigger. I have built boxes on the small side, and didn't care for the sound at all. I have built boxes with a Qtc of .5, which was about 3 times larger than the manufacturer recommended, and it sounded great. Did I mention bigger is better. Anyways, hopefully this was helpful.

Regards,
Matt
  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
6" Speaker Air Volume IXLoiero95XI Multi-Way 2 27th June 2013 11:39 PM
Calculate box air volume. Too Tall Multi-Way 6 12th September 2011 11:31 PM
Calculating box dimensions from cubic volume retroman Multi-Way 6 11th July 2009 04:06 AM
The relationship between air volume and SPL Onur Multi-Way 13 30th October 2007 01:07 PM
help! Dc cone movement while volume adjust. mikee12345 Multi-Way 9 24th June 2003 02:24 AM


New To Site? Need Help?

All times are GMT. The time now is 12:55 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
Copyright 1999-2016 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki