Hier die Vorführung des Real Time Analysers des Alesis DEQ230D. Anfangs ohne Peak-Hold, ab 0:55 mit nie endenden ...
Alesis DEQ 830 RTA digital Equalizer.
Equalizzatore grafico digitale programmabile a 1/3 di ottava - 24 bit AD/DA - I/O analogico bilanciato 1/4" - 60 programmi utente.
TEN TIPS TO REDUCE FEEDBACK
by Bruce Bartlett, Bartlett Microphones
SQUEAL! It's our old friend, feedback. Feedback in a sound system is that annoying howling or squealing tone you hear when the microphones pick up amplified sound from the loudspeakers. Sound from the speakers enters the mics, is re-amplified, and goes around in a feedback loop (Fig. 1). Almost instantly, the sound builds up until a loud tone occurs -- usually at a single frequency. When the sound from the loudspeaker at the mic is as loud as the sound from the actor, that's when feedback starts.
Fig. 1. The components in a feedback loop. Feedback can be a major problem in theater sound. Often the actors don't project their voices (especially in school productions), so the mic gains must be turned up high in order to hear them - causing feedback. In budget productions that use only floor microphones, those mics are far from the performers, so they require lots of gain. Even in high-end productions with several wireless mics ...