I believe a lot of friends in the use of audio feedback, have such experience: when using a single microphone, the microphone if squeaking, the use of acoustic feedback suppresser (e.g. by inserting) can be ideal to suppress howling sound. However, if the use of a microphone, received the howling effect is often not ideal, often only some of them even better single microphone effect, the rest of the microphone in push big volume, howling is not inhibited.

Due to the structure and characteristics of the phone, the phone index of different brands of frequency response, impedance, sensitivity, directivity is not consistent, even the same brand of microphone on these indicators have different degrees of difference, the microphone plus in actual use and use of different positions and other objective factors call frequency feedback caused by each microphone is not howling at the same volume occurs. If we use the conventional method of frequency shift, it is often the first place that the microphone howling will trigger suppressor point by frequency shift, the rest is not supported squeaking microphone frequency shift has not been effective. When the volume is large, the sound will be leased to the microphone microphone, the suppressor is powerless. If the acoustic feedback suppresser is inserted by the method of multiple units, each microphone point by frequency shift, so that many of these problems can be solved, but it caused the cost of lease equipment to improve the sound. If you hold a comprehensive dance party, this is a configuration in the installation and debugging on the two is time-consuming, the cost is not practical. In fact, the solution is very simple, as long as we use the correct method of debugging, with a feedback suppressor can achieve an ideal frequency shift suppression effect.

For example, there is a sketch show in the show, and 6 draws a clip microphone.

1, 6 with clip microphone in sound rental mixer are programmed as a group, the brightest, the bass and EQ channel gain GAIN button adjustable in the middle position, then the various auxiliary volume fader down.

2, in the 6 stage a microphone and concentrate on the most prone to howling, and then placed in the height of about 1m from the stage floor platform.

3, in accordance with the conventional sound amplification system. Insert the audio lease feedback suppressor into the corresponding INSERT interface of the 8 microphones.

4, will be connected in series between the light and sound mixer amplifier to lease each peripheral equipment (including acoustic feedback suppresser,) are arranged in the bypass, and the input and output of each knob equipment are provided at 0dB power amplifier attenuation knob is arranged on the middle position.

5, the console microphone output and main output fader fader marshalling are set at 0dB, through the cooperation between the gain knob and auxiliary clipper, respectively for each microphone for debugging.

6, the auxiliary microphone volume fader way slowly up, howling appears to be stable. Remember the way the clipper DB position, and then the way of debugging, then pull down the fader, second microphone and so on, until the 6 microphone debugging stable howling so far. This step is very important, need patience fine.

7, the main console output fader down to restore each cylinder in sub fader howling appear position.

8, will bypass key acoustic feedback suppresser into the working state, and select the S1 single point filtering method, and then slowly pull the main output fader. To be heard after the emergence of the whistle will be the frequency of the frequency of the 6 microphones to suppress the howling, until the suppressor on the red filter is no longer flashing lights.