The disc has two microphone mounts (21mm) and one stand connecting piece. By putting the stand connecting piece into the individual borings, the setting angle of the disc can be adjusted to any situation. The measuring cord located in the center of the disc serves for the adjustment of the microphones on the disc. The measuring cord can be adjusted on both sides.
Mounting of the microphones onto the Jecklin disc
The microphones are pushed from the rear through the holding clamps of the Jecklin disc. Take care that the microphone capsules on both sides are located at a distance of approx 8 cm directly above the disc center. This can be checked by means of the pulled-in measuring cord. In this case, the angles of the microphones are drawn slightly towards the outside.
Mounting of the connecting piece
The Jecklin disc with the microphones is at first held by hand in the position that is required for the recording. By loosening the fastening screws at the stand intermediate piece, the intermediate piece can be removed and set into any of the borings at the disc rim; i.e., the disc is attached at the preselected angle. Thus the balance of the entire arrangement is guaranteed and the adjustment to any situation is made possible.
Note from David Josephson: It isn't mentioned by Jecklin, but “the position that is required by the recording” is determined by the desired tone color balance. Most microphones are more sensitive toward the front than toward the sides and rear for high frequency sounds. Rotating the disc maintains the capsules at the correct distance from the disc but allows their angle to the sound to be adjusted for more or less high frequency information.