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 11th March 2005, 06:39 PM #1 serenechaos   diyAudio Member   Join Date: Feb 2004 Location: los alamos Back Load Horn Questions When calculating dimensions, If compression chambers are lined with Deflex, cork or what ever, Is the inside volume adjusted (increased) to include the thickness of what the chamber is lined with? In a horn with straight, parallel walls (e.g. Nagaoka), Is it worth lining the walls with something to break-up standing waves? (cork, or maybe gluing ½ round dowel to the walls?) Should the inside of the horn be finished smooth, rough, or does it matter? Thanx, Robert
 12th March 2005, 02:00 AM #2 Nelson Pass   The one and only     Join Date: Mar 2001 I don't think that horn dimensioning is all that critical. Regarding absorbent material to break up standing waves in the horn, see the KleinHorn pt 2 on www.passdiy.com where the first part is devoted to observations on that issue.
Elso Kwak
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Join Date: Dec 2001
Location: Zamboanga, City of Flowers, Mindanao

Quote:
 Originally posted by serenechaos When calculating dimensions, If compression chambers are lined with Deflex, cork or what ever, Is the inside volume adjusted (increased) to include the thickness of what the chamber is lined with? In a horn with straight, parallel walls (e.g. Nagaoka), Is it worth lining the walls with something to break-up standing waves? (cork, or maybe gluing ½ round dowel to the walls?) Should the inside of the horn be finished smooth, rough, or does it matter? Thanx, Robert
Hi Robert, The inside surface of a horn shouldbe a rigid non-absorbing structure. I once got the hint to line up the walls of my K-horn midrange horn with felt or other sound-absorbing material. When I did that the sound was completely attenuated, gone!

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