Yamaha Waveforce- waveguide a head of it's time? - 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 19th March 2010, 03:12 AM   #1
winslow is offline winslow  United States
diyAudio Member
 
Join Date: Aug 2005
Default Yamaha Waveforce- waveguide a head of it's time?

WF115F

I thought they looked cool and the price is right on the used market.
  Reply With Quote
Old 19th March 2010, 03:21 AM   #2
Banned
 
Join Date: Apr 2009
don't think so. "Waveguides" or horns (even round ones) have been around for decades contrary to the sales talk here on inventing them

How do they sound?
  Reply With Quote
Old 19th March 2010, 12:19 PM   #3
diyAudio Member
 
Inductor's Avatar
 
Join Date: Feb 2006
Location: Cascais
Quote:
Originally Posted by winslow View Post

Yamaha Waveforce- waveguide a head of it's time?
WF115F

I thought they looked cool and the price is right on the used market.
It's a "treandy Geddes design"...
GedLee - diyAudio

Last edited by Inductor; 19th March 2010 at 12:22 PM.
  Reply With Quote
Old 19th March 2010, 12:23 PM   #4
doug20 is offline doug20  United States
diyAudio Member
 
Join Date: Mar 2009
It doesn't look OS at all so its not really a Geddes type design.
  Reply With Quote
Old 19th March 2010, 01:00 PM   #5
expert in tautology
diyAudio Member
 
bear's Avatar
 
Join Date: Apr 2002
Location: New York State USA
It says it is a spherical waveguide.

Geddes afaik uses an eliptical waveguide. (aka Oblique Spheroid)

He has discussed the relationship and merits of the two...
Yamaha could not use the eliptical without having to deal with Geddes patents, I suspect.

_-_-
__________________
_-_-bear
http://www.bearlabs.com -- Btw, I don't actually know anything, FYI -- [...2SJ74 Toshiba bogus asian parts - beware! ]

Last edited by bear; 19th March 2010 at 01:03 PM.
  Reply With Quote
Old 19th March 2010, 01:09 PM   #6
diyAudio Member
 
Inductor's Avatar
 
Join Date: Feb 2006
Location: Cascais
Quote:
Originally Posted by bear View Post
It says it is a spherical waveguide.

Geddes afaik uses an eliptical waveguide. (aka Oblique Spheroid)
Oh I see... (anyway the round horns/HF are very much criticized by their distance to the mid/woofer driver)

Quote:
Originally Posted by bear View Post
He has discussed the relationship and merits of the two...
Yamaha could not use the eliptical without having to deal with Geddes patents, I suspect.
Maybe. Hope he doesn't make (patent) a circular woofer driver too... Usually the rights of the patents go the first ones to manufacture/produce it in large numbers (USA), meaning you can always lose your patent (if you are not using it).

Last edited by Inductor; 19th March 2010 at 01:19 PM.
  Reply With Quote
Old 19th March 2010, 01:49 PM   #7
doug20 is offline doug20  United States
diyAudio Member
 
Join Date: Mar 2009
Quote:
Originally Posted by bear View Post
It says it is a spherical waveguide.

Geddes afaik uses an eliptical waveguide. (aka Oblique Spheroid)

He has discussed the relationship and merits of the two...
Yamaha could not use the eliptical without having to deal with Geddes patents, I suspect.

_-_-
The only patent I know of is the usage of Foam in the horn. Geddes will not be able to patent a shape that has been defined for decades.
  Reply With Quote
Old 19th March 2010, 05:35 PM   #8
expert in tautology
diyAudio Member
 
bear's Avatar
 
Join Date: Apr 2002
Location: New York State USA
Quote:
Originally Posted by doug20 View Post
The only patent I know of is the usage of Foam in the horn. Geddes will not be able to patent a shape that has been defined for decades.
Feel free to review his patents.
I don't really think he can patent the use of "foam" in a horn, but apparently he has done that.

The roundness of the horn is not directly related to Geddes work, it may be the proper or best implementation, but that is a different matter. "Round" horns have been around since horns were invented, in the form of the conical horn.

The distance between the center axis of any horn and any woofer is likely to be too large to maintain an ideal spacing anyhow, so you have to choose your compropromise. No doubt Dr. Geddes has done just this in his commercial product(s).

Fwiw, I can't find anyone selling those Yamaha online - can't imagine they are cheap...

_-_-bear
__________________
_-_-bear
http://www.bearlabs.com -- Btw, I don't actually know anything, FYI -- [...2SJ74 Toshiba bogus asian parts - beware! ]
  Reply With Quote
Old 19th March 2010, 05:50 PM   #9
badman is offline badman  United States
diyAudio Member
 
badman's Avatar
 
Join Date: Sep 2003
Location: Sunny Tustin, SoCal
Quote:
Originally Posted by bear View Post
Feel free to review his patents.
I don't really think he can patent the use of "foam" in a horn, but apparently he has done that.

_-_-bear
I believe his patent specifically covers a total fill of the horn with foam. Other treatments that don't go 'all the way' are AOK.
__________________
I write for www.enjoythemusic.com in the DIY section. You may find yourself getting a preview of a project in-progress. Be warned!
  Reply With Quote
Old 19th March 2010, 07:30 PM   #10
Radian is offline Radian  Germany
diyAudio Member
 
Join Date: Jun 2004
Location: Wiesbaden
Why not heat it up and push on it so it ends up eliptical.
  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
Japan's ultimate RIAA Head Amp - Yamaha HX-10000: who have heard ? tiefbassuebertr Analogue Source 7 28th April 2011 06:07 PM
How much time a laser head should last ? gaetan8888 Digital Source 0 15th August 2007 02:43 AM
motor types head to head for a TT p_ete2003 Analogue Source 20 11th January 2007 08:29 PM
First time caller, long time listener... smallangryboy Introductions 15 19th March 2005 08:10 PM
is doing time alignment now a waste of time? Beggar Multi-Way 9 28th July 2003 05:45 AM


New To Site? Need Help?

All times are GMT. The time now is 08:54 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