what is a wave guide? - 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 14th March 2005, 08:15 PM   #1
Joules is offline Joules  United States
diyAudio Member
 
Joules's Avatar
 
Join Date: Nov 2004
Location: Manassas virginia usa
Default what is a wave guide?

What is a wave guide ?
  Reply With Quote
Old 14th March 2005, 09:43 PM   #2
Grahamt is offline Grahamt  Canada
diyAudio Member
 
Grahamt's Avatar
 
Join Date: Mar 2004
Location: U of Waterloo
Someone will be able to explain it better than me, but in the mean time, it is a contoured low diffraction tweeter face plate.
  Reply With Quote
Old 14th March 2005, 11:31 PM   #3
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Greets!

Per Daniel A. Russell, Science and Mathematics Department, GMI Engineering & Management Institute:

"A waveguide is a structure which forces wave propagation along a path parallel to its longest dimension. Acoustic wavequides are structures with constant cross-sectional area and shape. Simple examples of such structures include hoses, tubes, and pipes.......".

Note that there are many folks, including some horn designers, that erroneously refer to low gain horns as waveguides.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 15th March 2005, 12:05 AM   #4
diyAudio Member
 
Join Date: Feb 2002
Hmm, I'd say his definition is overly restrictive - I don't see any inherent reason why propogation needs to be strictly axial.

The Geddes definition might be closer to 'a device which transforms a particular velocity profile at it's throat to a specified velocity profile at it's mouth' ie 'guides' this input waves along a prescribed path to the output. (this is my own definition, I wouldn't presume to speak for Earl)

In common parlance as talked about around here, it's a horn with geometry that is designed to have a particular output radiation pattern. Most conventional horns are more concerned with acoustic gain than pattern control - a waveguide is concerned with pattern control rather than acoustic gain. Generally a waveguide will reduce to a conical flare at the mouth, but the throat geometry will be different and will be based on the geometry of the driver that is being used. The acoustic gain will be very similar to a conical.
  Reply With Quote
Old 15th March 2005, 12:53 AM   #5
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Greets!

While everyone is entitled to an opinion, a definition was asked for. Dr. Russell's is no different than the one in my '50s era collegiate dictionary so it seems reasonable to me that there's a good technical reason for it being so 'restrictive', I just don't know what it is.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 20th March 2005, 02:55 AM   #6
...truth seeker...
diyAudio Member
 
Ed LaFontaine's Avatar
 
Join Date: Feb 2004
Location: where the Appalachians rise from the Blue Grass
Default The "Geddes" waveguide

Dr. Geddes has said "All waveguides are horns, not all horns are waveguides". He strives for a more uniform output over a wider arc than is common with conventional drivers. He uses equalization for shaping the frequency response and acoustic foam to damp difraction within the waveguide...I think.
  Reply With Quote
Old 20th March 2005, 12:59 PM   #7
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
if you design a "waveguide" properly it can, itself, be a radiator -- of course this may be at microwave frequencies.

ordinarily we don't want our speaker cabinets to "radiate".
  Reply With Quote
Old 12th May 2005, 02:25 PM   #8
diyAudio Member
 
Join Date: Apr 2003
Location: Chicago area
Here is some waveguide info from Bob Smith @ SP Tech. The following is a commercial site but provides some very good reading into waveguide/horn theory. I've heard Bob's speakers which utilize waveguided baffles and must say that he is one heck of a speaker designer.
c.

http://www.4sptech.com/waveguides.php
  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
Short Tractrix tweeter wave guide domtw Multi-Way 3 3rd May 2009 04:05 AM
Pair of Selenium D210Ti and JBL Wave Guide xecluded Swap Meet 7 5th December 2008 08:07 PM
Anti-Wave Guide Computer Case ? Suggestions ? musicphile Everything Else 6 4th February 2007 01:51 PM
Sine wave - Square & Triangle wave generator using Transistors / OP-Amps lineup Solid State 20 9th October 2006 12:15 AM


New To Site? Need Help?

All times are GMT. The time now is 07:05 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