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B460IRR40P V1.0 Azden IRR-40P ‒ User & Installation Guide
Azden IRR-40P Soundfield
6. Demonstrate and set the volume level
for the user
It is important that the soundfield is set up properly.
We have found that most users tend to set the
system too loud. This is unnecessary and undesirable.
The golden rule is ‘if the user of the transmitter can hear themselves
very clearly from the speakers, then the volume is too loud’. It is difficult for the person
talking to judge the level of their own amplified voice.
There are two ways to set up a soundfield properly; one uses a sound level meter and
the other relies on the subjective judgement of another person. Both methods require
two people with the class teacher preferably being the one doing the talking.
Setting the correct volume level
This is normally only necessary upon installation. In normal use, from person to person,
it is not necessary to alter the volume since the sound out of the speakers should be
about the same as directly from the person talking. However, if a
particular user has a quiet voice then the transmitter may be moved
nearer to the mouth.
l
Wear the microphone as shown.
l
Walk to the point in the room furthest away from the IRR-40P
and invite a colleague to join you.
l
Switch the transmitter off for the moment.
l
Talk in a normal voice to your colleague while they stand about
1 metre in front of you.
l
Ask your colleague to remember the average sound level by
either....
a) Using a sound level meter
or
b) Remembering the sound level by ear
....and then get them to walk over to the IRR-40P amplifier.
l
Switch the transmitter on.
l
Ask your colleague to increase the 'Channel 1' volume control on the amplifier,
whilst you continue to talk in the same normal voice as before, until either....
a) the sound level shown by the meter at where they are standing is the same
average value as when they were standing in front of you.
b) until they judge the sound level at where they are standing to be about the
same as when they were standing in front of you.
l
The tone control can now be adjusted if necessary to optimise vocal clarity.
MXY139A
