OTL Asylum

if they were true 1/4 wave length

68.33.3.16

Penguin

A

In Reply to: RE: Transmission line? posted by Lew on August 16, 2014 at 13:39:53

you would not want to close the ports, that would affect the rear impedance of the speaker air interface undesirably. you want an open port which is then presented as the inverse of the port impedance on the back of the speaker.

dee
;-D

True terror is to wake up one morning and discover that your high school class is running the country.

quote by Kurt Vonnegut

http://www.quarter-wave.com (Open in New Window)

Follow Ups:

Were you addressing me? - Lew 16:19:50 08/16/14 (6)
If so, I agree. Those ports would be open or else no TL.
I've built two pair of TL woofer systems in my day, one pair of which I dug out of storage to use with my Beveridge 2SW speakers. Mine mimic the classic Bailey design as implemented by Irving M Fried. However, the shape of Duke's cabinet shown in the photo leaves open a question as to what goes where, but odds are that it's a TL, of some kind, IMO.
- They aren't ports! That is where the splash drivers go. - Ralph 09:22:44 08/19/14 (4)
  The splash drivers face upwards and assist with soundstage imaging.
  
  They work quite well too! Duke demonstrated the concept at RMAF last year and again at Newport- they had the speaker set up with a switch so the drivers could be shut off. The soundstage, while still good, is smaller and less focused without them.
  - RE: Shades of omni ! - hitsware 16:26:15 08/19/14 (0)
    I'll bet those do sound nice .... :)
  - Duke - Lew 11:43:37 08/19/14 (2)
    Besides being one of the nicest guys in audio, Duke is also an adventurous and innovative manufacturer. I would love to hear those speakers.
    - +1 - Ivan303 19:12:51 08/27/14 (0)
      True that.
    - Yup! His speakers are really easy to drive too- just like they were made for our amps :) nt - Ralph 11:54:35 08/19/14 (0)
      -
- yup - Penguin 18:56:05 08/16/14 (0)
  I was, and glad we do not disagree :), closing up the port with a driver would be a strange thing. If they are half wave length...well that would lead some interesting discussions about driving it from both ends.....
  
  dee
  ;-D
  
  True terror is to wake up one morning and discover that your high school class is running the country.
  
  quote by Kurt Vonnegut

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