SPL values combined vs dissimilar - 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 26th June 2009, 04:10 PM   #1
diyAudio Member
 
Join Date: Jan 2004
Default SPL values combined vs dissimilar

Hi there,

Just wanted to ask a question in connection with setting up subwoofers : either gain matching or level matching.

It's been said that if you gain match two subwoofers, the SPL values will differ if both subwoofers are placed in different locations.

So obviously the SPL generated per sub will be dissimilar.

The other approach is to level match. Calibrating each sub to equal SPL levels. Now if both subwoofers were to generate equal SPL levels, you will achieve a 6 dB output advantage (especially if in phase).

Now what I would like to know from some here is : if you combine two dissimilar dB values, you won't gain that same 6 dB output (even if both subwoofers were in phase) ?

What I know about coupling and maximizing output is that in order for that to happen both subs would need to be in phase and in level.

Just want to have some discussion on this from the physics majors....
  Reply With Quote
Old 26th June 2009, 07:42 PM   #2
diyAudio Member
 
Join Date: Jan 2004
Anyone have any views on this ?
  Reply With Quote
Old 29th June 2009, 09:49 PM   #3
diyAudio Member
 
Join Date: Jan 2008
Vaughan,

The combined level of two non-correlated dB values varies from a maximum of 3 dB gain to less than 1/2 dB gain over the larger amount when the difference is 10 dB.

Do you have a specific question?
  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
Dissimilar metal voltage source issue bcdzt5 Parts 5 11th March 2008 12:58 AM
Star ground with dissimilar metals: concern? serengetiplains Tubes / Valves 9 13th April 2007 07:35 AM
Dissimilar triode Tobruk Tubes / Valves 1 6th April 2007 09:52 PM
Isobaric with dissimilar drivers. Circlotron Multi-Way 10 6th February 2007 09:09 AM
Can dissimilar xfrmr secondaries be wired in parallel? leadbelly Parts 5 2nd March 2004 03:21 AM


New To Site? Need Help?

All times are GMT. The time now is 08:55 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