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Operation
Before starting operation, make sure that the transmitters are fitted with batteries of sufficient
charge and that the antennas are fitted properly to the receiver.
A. Powering up
Following a proper power-up sequence protects your equipment – specifically speakers – and your
ears. Follow the below procedure:
Turn down all output volume controls of any equipment in your audio system.
Switch on your audio sources first (Tuners, CD Players, PC’s with soundcards, Tapedecks, etc.)
Switch on the audio mixer
Switch on any audio processor between the mixer and the amplifier(s) [if any].
Switch on the amplifier(s).
Turn up the audio level on your sources if such controls are provided.
Set the audio output of your mixer to a low level.
Set the audio output of any audio processor between the mixer and the amplifier(s) to a medium
level [if any such processors].
Turn up the volume controls of your amplifier(s) slowly.
Make adjustments to all volume settings as needed.
For switching off, follow the inverse sequence – always switch off your amplifier(s) first, then any
processors between mixer and amplifier(s), then the mixer, then the sources.
B. Use
Apart from using good equipment, good sound comes from using it correctly. Level setting mistakes
are one of the common reasons why even good equipment may not perform as desired. For setting
levels, please be reminded that two guidelines need to be followed:
Avoid distortion by leaving some headroom. Never overrun any audio-equipment’s inputs. Level
meters and displays allow you to make sure that signals do not enter critical levels.
Avoid unnecessary amplification by using as little attenuation as possible. For example, if you turn
down the input gain of a mixer to minimum, and then increase the main output of the mixer to maxi
mum to drive your amplifier properly, you will create unnecessary noise, as you first dispose of some
already existing signal level, and then later apply amplification (tainted with noise) to make it up.
Obviously, these two requirements are marking a levelling window that the operator must match to
achieve a good sound with as little distortion and noise as possible.
C. Specific considerations about wireless equipment
Retain a line of sight between transmitter and receiver - any visible obstacle is also an obstacle to
radio waves.
Since it is easy to move around with wireless microphones, make sure that you do not occupy posi-
tions close to speakers which may spur unwanted feedback.
Do not cover antennas and make sure the received antennas are not inside a flight case or similar.
Avoid large metal objects in close proximity of the receiver, as they may absorb much of the radio
energy.
Do not operate several transmitters of different frequency closer than 2m to the receiver. The
spurious emissions of a transmitter can be strong enough in such proximity to cause reception on
an unwanted, other channel. If you wish to operate very closely to the receiver, only operate links 1
and 4 and turn the output volumes of links 2 and 3 to zero.
Switch transmitters off whenever possible, to extend the battery life and avoid any unwanted inter-
ference.
USER MANUAL - WMU401 4-LINK UHF WIRELESS MICROPHONE
