paralleling voice coils - diyAudio
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 15th November 2002, 01:13 PM   #1
diyAudio Member
 
Join Date: Oct 2001
Location: UW Stevens Point Campus
Default paralleling voice coils

Hello,
I have found a sub in my basement collection with dual voice coils. What is the effect on spl when the voice coils are put in parallel as opposed to series?


thanks,

Opie
  Reply With Quote
Old 15th November 2002, 01:41 PM   #2
diyAudio Member
 
Join Date: Sep 2001
Opie, the efficiency of the driver will be unchanged with either connection, but the sensitivity will be different.
Suppose each coil is four ohms, and driven from a voltage source providing 2volts. With the coils in parallel, each will draw a current of 2/4=0.5 amps. If the product of flux density and coil length (Bl) is say 5 for each coil, then the force produced is F=Bli x2= 2.5 x 2 =5
Now wire them in series. Each will now only have 1volt across the coil, so the current in each coil is now only 1/4=0.25 amps. The total force is now 5 x .25 x 2 = 2.5.
The force on the cone is now one half that of the parallel connection, so the output is 6dB down, though the impedance is 8ohms rather than 2ohms.

Andrew
  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
Opposing voice coils? JCoffey Subwoofers 2 6th November 2008 02:54 PM
corroding voice coils pdan Full Range 15 30th August 2007 01:11 PM
Voice coils - too many, all must go. Toddy Audio Swap Meet 3 31st December 2003 03:46 AM
Dual voice coils Opie Multi-Way 1 19th December 2002 04:38 PM


New To Site? Need Help?

All times are GMT. The time now is 03:32 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