Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

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 13th January 2003, 01:12 AM   #1
diyAudio Member
 
Circlotron's Avatar
 
Join Date: Jun 2002
Location: Melbourne, Australia
Default Cone displacement vs power input?

Lets say you drive your speaker with a 5 volt rms low frequency tone and it vibrates 1mm p/p. If you double the drive to 10 volts rms then the current should double as well (ignoring voice coil heating, and airgap flux and suspension nonlinearities. So if the current doubles the magnetic force and therefore the cone movement would double as well. Now the power has quadrupled as well because we have doube voltage *and* double current. So it appears the cone movement goes up proportionally as the drive voltage increase, and as the square root of the power increase? Does this sound correct?

Putting it another way, if it needs 1 volt and say 1 watt (1 ohm speaker) to drive a cone 1mm p/p then it would it take 10 volts and therefore 100 watts to drive it to 10mm p/p?
__________________
Best-ever T/S parameter spreadsheet.
http://www.diyaudio.com/forums/multi...tml#post353269
  Reply With Quote
Old 13th January 2003, 03:08 AM   #2
Wizard of Kelts
diyAudio Moderator
 
Join Date: Sep 2001
Location: Connecticut, The Nutmeg State
Circlotron:

Yes, you have it right.

Another way to look at it is to say that 4 times the power yields an extra 6 dB of SPL.

If you are planning to use this as a formula to see how much cone excursion is necessary to produce what SPL at a given tone, please check out the charts in the following thread. These are for sealed systems only, where the cone provides 100% of the bass output. for ported systems, you can multiply the speaker Volume of Displacement, Vd, by four. the first chart is for normal measurement, the second is for Metric.

Volume Displacement For SPL Chart

PS: Hitting F11 makes reading the charts easier.
  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
Volume Displacement For SPL Chart kelticwizard Multi-Way 12 24th November 2013 09:58 PM
Volume Displacement Calculation lovitz Multi-Way 5 11th March 2007 12:52 AM
quartz displacement guytou Digital Source 5 6th May 2005 10:01 PM
Calculating woofer displacement eRiCdWoNg Multi-Way 5 20th April 2004 01:14 PM
driver displacement joelives Multi-Way 2 11th June 2003 05:02 PM


New To Site? Need Help?

All times are GMT. The time now is 10:35 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