The Duelund Horn


Introduction

Steen Duelund, who died the last week of April 2005, has kindly permitted the inclusion of this material on this site, and the actual design is - according to email from him - released for anyone to build, privately as DYI or commercially. Please note that two versions of the horn design are documented on this site, the standard version, The Duelund Inboard Concrete Monster and the egoists version, The Duelund Inboard Concrete Behemoth. Both are quite benign in a real living-room because of their quite small actual footprint. The small version is for a single 8" unit, the large version is for a single 10" or if you insist a single 12" unit, the latter is a tight fit, but it can be done, and I can tell you that it works very well thank you, because I have once had a pair of those with Tannoy 12" units.
Someone emailed me some time ago that the mixture of concrete and gypsum suggested by Duelund is not long term stable, and may crack. I will advice you to look into whether this is a confirmable problem and if so to research alternative materials.

Theory

Shortform building procedure

Tuning the cabinet to the actual loudspeaker

Materials for the Duelund Inboard Concrete Monster

Materials for the Duelund Inboard Concrete Behemoth

Illustrations

Literature

Disclaimer


All text initially in Danish by Steen Duelund, 1974, translated and slightly tweaked by Peter Larsen, 2000, except for the introduction and theory stuff that had to be rewritten by Peter Larsen for this web publication.

Please note that it is the construction that is released for anyone to build, not the documentation for anyone to copy and distribute!

Version for this section: 1.06, date of this version: January 3, 2006

Version 1.00 went online on March 13th. 2000, UTC 21:17

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