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Acoustically adapting the Soundfield System to a room
Before you use the Soundfield System for the first time in a room, you should acoustically adapt it to the room. Turn on both the bodypack transmitter and the microphone. Reset the two volume controls Turn on the amplifer. Adjust the volume of the microphone so that the speaker�s voice can be clearly understood but doesn�t sound unnaturally loud. In long, narrow rooms it might be advisable to reduce the level of the front loudspeakers compared to that of the rear loudspeakers by means of the loudspeaker output level control ¹, since the speaker�s voice additionally supports the front part. You can reduce the level of the front loudspeakers compared to that of the rear loudspeakers by up to 12 dB. Use the bass control and the treble control to adapt the sound of the voice to both the acoustic situation in the room and the characteristics of the connected loudspeakers.
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and
on the amplifier to �0�.
Many of the sounds which are important for speech intelligibility are in the high frequency range above 4 kHz. Hissing noise and so-called plosives ([s], [t], [f], etc.) mainly consist of high frequencies. In order to ensure that the speaker can be clearly understood, use the treble control to adjust the treble response to a sufficient value. If the high frequencies are enhanced too much, the voice sounds �sharp�, which might be disturbing in the long run and increases the risk of feedback. Use the bass control to set the bass response so that the voice doesn�t �hum�. Since the low frequencies are not that important for speech intelligibility, it might be advisable to adjust the bass response to a comparatively low level during classes.
