• Item: 3 Way Floor Standing Loudspeaker  
  • Type: Dynamic loudspeaker  
  • Posted: 9 April 2012  
  • Builder: Busk Audio  
  • Country: Denmark  
  • Comments: 3  

The Conductor Api

The project is a build for a very good friend. It started out as passive design, but is now converted to active.

The name “The Conductor Api” came from my wish to make a loudspeaker, that should “inspire” or “lead” others to go a little further in designing loudspeakers, and the Api is from the bass design that is an Aperiodic design with flow resistors. It is 1 out of 3 sets of conductors made, The Conductor Alu (my gift to my wife) wish is a now closed version with the Aluminum membrane, and The Conductor Pap wish is a closed version with the paper membrane.

Tweeter: Vifa XT25.
Midrange: Scan Speak 15M.
Bass: Scan Speak 26W (alu).

The Cabinet is made of a sandwich of 19mm chipboard as inner cabinet. On the sides and bottom there are a extra single layer of 19mm MDF, total thickness of 38mm. Front has 3 extra layers of 19mm MDF, total thickness of 76mm. Top and Rear has 2 extra layers of 19mm MDF, total thickness of 57mm. It has always been my coal to make a very solid cabinet that brings vibrations down as much as possible, the front plate is the first thing that I attack, because it is here where the vibrations start and should be killed at once. The tweeter midrange part has a slanted rear so direct reflected sound away from the midrange, so it isn´t going directly back to the membrane and causing distortion.

The facets cuts are not only for design but also because of the influence of diffractions from 90 degrease edges. Top and rear facet cut are for design, and makes the speaker look slanted always.

The recess around the tweeter midrange is also for design.

The 3 conductors has been a journey for me to evolve even more in loudspeaker building, which has been my hobby for 20years, and has given a lot of knowledge and inspiration for my future Reference loudspeaker, which will be a 4 way giant at 243cm in height with 7cabinet per side and 9 drivers per side. But that will be a story starting here in 2012.


  • Wardsweb
  • 9 April 2012 at 10:50AM
  • Excellent build! How did you achieve the piano black finish on the MDF?
  • Busk Audio
  • 9 April 2012 at 11:09AM
  • Thanks a lot.
    It is the local Car paint shop that has paintet them.
    I did´t a little fill out som small places, but they did the rest.
  • MajorTendonitis
  • 1 December 2018 at 11:58PM
  • Just joined . Super impressed with your build .
    Can you share how you got those nice angled cuts on the front ?
    They really take what would be a mediocre looking enclosure to the next level .
    You’d need a jig to go threw a bandsaw , and a belt sander wouldn’t give you those consistent cuts

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