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In contrast to the former designs with a radius at the side of the frontpanel i choosed a slope at the transition from front-to sidepanel. It is easier to construct and put the veneer on it afterwards. The front shape is as small as possible  to prevent interfering from speakersound  with reflection from the front panel. It is also easy to construct the platform in the same manner which makes the coupling of the vent to the base harmonic. With the vent at the bottom a vent cover is not necessary. To adjust the vent-opening i built bushings with different length from 10 to 55 mm. After tuning the best distance the bushing is tightened between  platform and box with threads.  




  • front-and backpanel double thickness   (damping)
  • additional cross-braces to reduce the free length for vibrations   (damping)
  • all hollows filled with dry sand   (damping)
  • scalloped area behind speakers   (reduced backload)
  • high- and low pass of the crossover in seperate chambers   (electronic interaction, vibration)
  • slopes at side of front panel   (acustic reflection)




  • bi-wiring terminal; individual connection for speakers   (optimized cable for woofer and tweeter)
  • seperat chambers for high- and low pass of crossover    (electronic interaction, no disturbance in line cross-section, less vibration from acustic wave to electronic components)
  • minimized speakercable length inside box   (electronic damping)
  • high quality components   (dynamics, distortion, stability over lifecycle)



  • d'Appolito design for speaker and crossover in golden ratio   (see description from Lynn Olson)
  • finetuning of vent  with variable distance-bushings   (low frequency behaviour, electronic damping)
  • fixed speakercable inside box   (prevent knocking sound from cable with panel at low frequency)
  • minimized distance between tweeter and woofer   (harmonic acustic transition )
  • speakers even with front surface   (acustic reflection)






   © 2002 by korherr •