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22nd August 2007, 01:12 PM
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diyAudio Member
Join Date: Aug 2005
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Karlson HF waveguide tweeter lens
Karlson's open ended waveguide antenna is one of my favorite high frequency lens and can present a wide, high and natural sounding soundfield.
A 5.3"-5.5" half-ellipse tube made of 1" ID pvc will work well. This is roughly the size of Walter Zintz's Transylvania Power Company "The Tube". ("The Tube" had 2 degree down-sloping walls and a different aperature) Karlson's X15 tube from ~1966 had a diameter transition giving a graph notch at ~2K2Hz and ~holographic sound (try playing a good recording of a rain storm) 1 inch ID tube angled ~ 30 degrees up on a X15 size coupler http://img405.imageshack.us/img405/3...nx154ozpm0.jpg 1.875" ID x 9" Karlson tube on an 18" coupler angled 30 degrees down http://img233.imageshack.us/img233/3402/9tubege8.jpg 1" ID half-ellipse tubes of schedule 40 before filing and sanding http://img479.imageshack.us/img479/7890/thick17ky.jpg Graph at 30 degrees tilt with CD8 of 1" tube vs a 9" tube with diameter transition(s) CD8 was limited to ~12Khz http://home.earthlink.net/~buddhaboy2/9v7.jpg Transylvania Power's Karlson tube "The Tube" http://img457.imageshack.us/img457/7622/tt6wb.jpg X15 tube replica 1.875" x 7.25" http://home.earthlink.net/~buddhaboy2/X15/X15Tube.jpg Thinwall pvc half-ellipse tube http://home.planet.nl/~ulfman/images...Tube1-Thin.jpg |
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