"Erste Hilfe-Tricks" - Kontrabass Feedback eliminieren

  • #21

Hier ein paar Erläuterungen zur Phasenumkehr:

FEEDBACK REDUCTION BY PHASE-REVERSION​

Fig. 3 illustrates the distribution of the sound-pressure relative to the respective feedback frequency. This frequency depends on your instrument and lies between 120 and 150 Hz. So the distance from pressure-maximum to pressure-minimum (wavelength) measures about 3m (10').
In order to avoid any influence on your instrument from the speakers you should choose your playing position in a pressure-minimum area, since this achieves the clearest sound and lowest feedback-tendency.
The SCHERTLER® DYN-B Transducer is equipped with a phase-reversion switch; which offers you the possibility of feedback reduction. This is particularly helpful if you have to play with high volume or close to speakers or monitors.
As shown in fig. 3 the pressure-maximum areas are shifted half a wavelength (ca. 1.5 m – 5 ft.) by activating the switch (by simple rotation). So you can change your "playing-position" without actually moving.
The practical use of the switch is very easy. With only a little experience you will quickly locate a pressure-minimum zone that will become your playing position.
Follow these simple steps:
Have a soundcheck with high volume. Rotate the phase-reversion switch and notice on which position the sound is more transparent, i.e. where it tends less to feedback. You can also tap on the instrument near the Transducer. On the "wrong" switch-position you will hear the longer resonance.

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