Does hybrid dipole bass move diaphragm? - Page 2 - diyAudio
Go Back   Home > Forums > Loudspeakers > Planars & Exotics
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Planars & Exotics ESL's, planars, and alternative technologies

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
Thread Tools Search this Thread
Old 2nd February 2005, 04:36 AM   #11
diyAudio Member
Bill Fitzpatrick's Avatar
Join Date: Jun 2001
Location: Eugene, OR
It occurs to me that one of the things that can be done to reduce the problem, at least in one respect, is to locate the mid-range and tweeter in low frequency axial standing wave nodes. I've never heard anyone talk about this thought before.
  Reply With Quote
Old 2nd February 2005, 05:40 AM   #12
Stocker is offline Stocker  United States
diyAudio Member
Join Date: Dec 2003
Location: Austin
Perhaps, but wouldn't there be various locations for the nodes depending on frequency?
Jesus loves you.
  Reply With Quote
Old 2nd February 2005, 06:17 AM   #13
diyAudio Member
Join Date: May 2002
Location: Switzerland
A little off-topic tough (since it is not dealing with ESL) but the mechanical stress on drivers by acoustical coupling is even relevant in the ara of tough professional equipment:

"For example, the horns attached to the driver act in both directions - not only do they transform and radiate sound from the driver to the outside world, but they also focus external sounds on to the diaphragm, adding significantly to its stresses."

Taken from:


  Reply With Quote
Old 3rd February 2005, 11:30 AM   #14
Pan is offline Pan  Sweden
diyAudio Member
Join Date: Sep 2002
If a closed box sub is used with dipole you simply place the sub at 90 degrees to dipole and voila, no problem from the direct outputoif the sub.

And with multiway dipole you need a gap between each range just like ML did it with their big speaker system.

The problem also exist with coned drivers as someone was concerned with, but the cone mass and enclosed volume beind makes this much less of a problem compared to a dipole ELS membrane.

By the laws of nature the mids and tweeters thast are most sensitive to this is of course those with soft suspension, low mass and big volume of air in the box behind. The stiffer the suspension, higher the mass and smaller the volume of air in the box the less this moving system will move according to a outside pressure acting on it.

Moving coil dipole speakers are more sensitive than closed box but less so than ESL.

In the end it is actually dipoles (no matter if moving coil, ESL or magnetostats) that can be arranged to be least affected by this phenomena, simply by doing it like ML. With perfect symmetrical dipoles and air gaps between panels there will be no force acting between the panels.

  Reply With Quote
Old 3rd February 2005, 04:11 PM   #15
Pan is offline Pan  Sweden
diyAudio Member
Join Date: Sep 2002
Originally posted by Stocker
Perhaps, but wouldn't there be various locations for the nodes depending on frequency?

And while a boxed mid/tweeter would function best at a certain frequency node where the pressure is max and speed of air is minimum, the other way is true for a dipole velocity source.

Think about how dipoles vs. monopoles excite room modes... they do not do that in the same way and at same locations... food for thought.

  Reply With Quote


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
Hybrid Dipole Steve Cresswell Multi-Way 13 2nd November 2008 09:22 PM
Dipole bass or Ripole Bass? MJL21193 Subwoofers 13 15th September 2008 07:42 AM
newbie needs help with dipole woofer hybrid esl CharlieM Planars & Exotics 4 26th February 2008 10:03 PM
ESL and Dipole hybrid system. christophorus Planars & Exotics 13 26th January 2004 09:18 AM

New To Site? Need Help?

All times are GMT. The time now is 10:56 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2