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Sennheiser EMP 2015 Soundfield System Manual

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65
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.
Ǡ Turn on both the bodypack transmitter and the microphone.
Ǡ Reset the two volume controls ᕢ and ᕣ on the amplifier to “0”.
Ǡ Turn on the amplifer.
Ǡ 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.
Ǡ Use the bass control Ƹ and the treble control ƹ to adapt the sound of
the voice to both the acoustic situation in the room and the characteristics
of the connected loudspeakers.
Ǡ 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 ƹ 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.
Ǡ Use the bass control Ƹ 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.
… 29 …


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