Planar Wave horn |
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Dave Slater
Registered User Joined: 28 February 2004 Location: United Kingdom Status: Offline Points: 373 |
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@ nexus where did you get that design from? i was just about to try simulating it in akabak and it had gone!
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Mircea Bartic
Old Croc Joined: 18 February 2005 Location: Romania Status: Offline Points: 2581 |
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you got it right James unfortunately there are no building pics for this one I hope the customer will send me some pics when he has time |
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general manager & head designer at nexus-acoustics research
http://www.facebook.com/nexus.acoustics.research Ex Nexus_3 |
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Mircea Bartic
Old Croc Joined: 18 February 2005 Location: Romania Status: Offline Points: 2581 |
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1. the design is still using a Helmhols resonator, but beside that there is a waveguide in front of the speaker. this subwoofer acts like a horn above 60Hz but below it's like any bassreflex design, It's a bit weird, but it is not based on sims and serious design, for the simple reason that I have no programs that can simulate this thing. Trial and error is the key word. 2. it says cobra pwh because I used the picture of the cab made by dynacord to draw that picture. P.S. Dynacord subs do not look like that on the inside They use resonators inside the mouth of the waveguide, and that causes some problems, because in theyr design the sub sounds BAD at close range By extending the resonators at the waveguide mouth we were able to corect some phase abnomalies thay ocured in the previous design, and make it sound much better at close range. Dynacord's problem came from the fact that the resonators worked inside a horn that was not able to sustain the long wavelenght that they produced. this design is smaller than dynacord's by about 30% and sounds better |
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general manager & head designer at nexus-acoustics research
http://www.facebook.com/nexus.acoustics.research Ex Nexus_3 |
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Mircea Bartic
Old Croc Joined: 18 February 2005 Location: Romania Status: Offline Points: 2581 |
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that design is posted on my forum I used a free hosting to store it, but now it should work again. |
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general manager & head designer at nexus-acoustics research
http://www.facebook.com/nexus.acoustics.research Ex Nexus_3 |
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Mircea Bartic
Old Croc Joined: 18 February 2005 Location: Romania Status: Offline Points: 2581 |
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general manager & head designer at nexus-acoustics research
http://www.facebook.com/nexus.acoustics.research Ex Nexus_3 |
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Dave Slater
Registered User Joined: 28 February 2004 Location: United Kingdom Status: Offline Points: 373 |
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cool i'll see what i can do
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TDA-Audio
Registered User Joined: 11 February 2005 Location: Russian Federation Status: Offline Points: 294 |
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PoteirosCorp
Registered User Joined: 31 August 2004 Status: Offline Points: 178 |
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Hey TDA, have you more information from de plan of your photo ?? Size of the ports, wich drivers use, ect, etc ??
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freddyi
Registered User Joined: 22 September 2004 Status: Offline Points: 936 |
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~like yamaha patent?
link by DJK when trying to figure out "basspipe" http://164.195.100.11/netacgi/nph-Parser?Sect1=PTO1&Sect 2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm& r=1&f=G&l=50&s1=5313525.WKU.&OS=PN/5313525&a mp;RS=PN/5313525 Edited by freddyi - 06 April 2006 at 6:31pm |
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navsys
Registered User Joined: 29 July 2005 Location: United Kingdom Status: Offline Points: 30 |
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Looks like that patent has expired, so no problems with making this type of speaker. I was wondering what frequency have you made the front waveguide resonate at? The front waveguide looks a little short to me, so whilst the extra width pulls the resonant frequency down, doesn't it reduce the loading on the driver at the higher frequencies? Would a small triangular section in front of the speaker to act as a throat into a small section of horn load the speaker better? They look rather attractive in that you can ( with a few modifications to the dimensions) make one out of a single sheet of ply (apart from the bracing and vents)
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_djk_
Old Croc Joined: 23 November 2004 Location: United States Status: Offline Points: 6002 |
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"Looks like that patent has expired, so no problems with making this type of speaker" The Yamaha patent is still active, but may not be a problem unless you are going to build for retail sale. This type of patent runs for 17 years from date of issue. Newer patents run 20 years from date of application (after being granted). This ends up being about the same length of time as it takes about 3 years after applicatin before they issue. Paul Voigt used a 1/4 W stub with his designs back in the '30s, I doubt if a modern patent would stand up to litigation. The design from Nexus_3 looks well thought out. Edited by _djk_ - 08 April 2006 at 12:47am |
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djk
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Mircea Bartic
Old Croc Joined: 18 February 2005 Location: Romania Status: Offline Points: 2581 |
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general manager & head designer at nexus-acoustics research
http://www.facebook.com/nexus.acoustics.research Ex Nexus_3 |
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