Angle Of Incidence; Feedback; Backing Vocals; Multichannel Systems - AKG HT 4000 Bedienungsanleitung

4 Operating Notes

4.6.2 Angle of Incidence

Refer to fig. 7.

4.6.3 Feedback

Refer to fig. 8.

4.6.4 Backing Vocals

Refer to fig. 9.

4.7 Multichannel Systems

5 Cleaning

24
Proximity effect is a more or less dramatic boost of low frequencies that occurs when you sing into the
microphone from less than 2 inches. It gives more "body" to your voice and an intimate, bass-heavy
sound.
Sing to one side of the microphone or above and across the microphone's top. This provides a well-bal-
anced, natural sound.
If you sing directly into the microphone, it will not only pick up excessive breath noise but also overem-
phasize "sss", "sh", "tch", "p", and "t" sounds.
Feedback is the result of part of the sound projected by a speaker being picked up by a microphone, fed
to the amplifier, and projected again by the speaker. Above a specific volume or "system gain" setting
called the feedback threshold, the signal starts being regenerated indefinitely, making the sound system
howl and the sound engineer desperately dive for the master fader to reduce the volume and stop the
howling.
To increase usable gain before feedback, plasce the main ("FOH") speakers in front of the microphones
(along the front edge of the stage).
If you use monitor speakers, be sure never to point any microphone directly at the monitors.
Feedback may also be triggered by resonances depending on the acoustics of the room or hall. With res-
onances at low frequencies, proximity effect may cause feedback. In this case, it is often enough to move
away from the microphone a little to stop the feedback.
1. Never let more than two persons share a microphone.
2. Ask your backing vocalists never to sing more than 35 degrees off the microphone axis.
The microphone is very insensitive to off-axis sounds. If the two vocalists were to sing into the micro-
phone from a wider angle than 35 degrees, you may end up bringing up the fader of the microphone
channel far enough to create a feedback problem.
If reception on the selected carrier frequency is disturbed, increase or decrease the carrier frequency by
at least 50 kHz or one or two Subchannels on each transmitter and receiver.
This is necessary to provide the minimum frequency spacing required for intermodulation-free multi-
channel operation.
To clean the transmitter surfaces, use a soft cloth moistened with water.