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former design
design targets
new design


The Ariel is a tandem transmissionline resonator enclosure.The two lines are connected at the end; also called Y-tunnel. Each enclosure consists of two 13 cm woofers and a 28 mm dome tweeter arranged in d'Appolito shape.

Former Designs

Here is a short listing of the former designs. For detailed information i recommend to read the interesting description on Lynn Olson's page. There you will find the details about  the design principles and the development of the crossover.

MK II - lines connected at the first part of the lines                                   - vent at the bottom plate; variable
MK III - little modified line shape
MK IV - modified line shape, connected at end of lines                               - vent at bottom plate; variable
MK 4.5 - backpanel  stiffer because of a crossbrace                                    -vent is placed to the back and  ajustable by a panel
MK 5b,r,s - like 4.5, but different vent placement: bottom(b), rear(r), side(s)
MK 6c - bigger line cross-section, impoved stiffness with double sided front- and backpanel; more parts can be filled with sand


Design Targets

  • natural sound
  • good dynamic behaviour
  • high resolution
  • lean front shape
  • vent tunable after assembly
  • crossover tunable after assembly



New Design

After comparing the different Ariel designs, it seems to me that the MK 6 version has the most advantages concerning stiffness and line cross-section. Experiece from other TL-speaker projects showed me, that the tuning of damping, vent and crossover has an essential influence on the sound in the  specific room where you listen to the music; so i decided to combine the geometrie from MK 6c with the variable vent at the bottom plate from MK 5b. To keep the crossover tunable i placed the tweeter- electronic parts on a seperate plate behind the tweeter and the woofer-parts in the housing behind the biwiring-plate at the backside of the enclosure. By removing the tweeter or biwiring-plate you are able to adjust the crossover. To damp housing vibrations the front and backpanel have double thickness and the hollows are filled with dry sand wherever possible. To get a harmonic coupling from vent to room, i placed the box on a podest with a strong slope to the floor. 

For detailed description look under features.








   © 2002 by korherr •