MIPRO ACT-7H Handheld Transmitter - Manual (Page 5)

7 8
CAUTIONS
! The ACT-7H has an integrated antenna at the end of the rear
housing (covered by the color protective cap). Performer
should avoid holding the microphone over or near the antenna
section as this will deteriorate transmission efficiency. Severe
deterioration if performer directly covers up the antenna
section with both hands.
! Many performers tend to hold the microphone by the top grille.
Unfortunately, this position seriously degrades both the sound
quality and directionality of a microphone. Even the most
expensive microphones will have its original sound quality
compromised by this method. Grabbing a microphone by the
grille will isolate the capsule's acoustic resonance circuit and or
change the capsule resonator's frequency. This results in an
inferior performance in both frequency response and the
separation of directionality. In addition, a palm's sound-
focusing effect will tend to strengthen resonances in certain
frequencies and can cause unwanted echo.
! A proper technique is required for using directional
microphones because the distance between the microphone
and your mouth has a significant impact on sensitivity and
performance. There is an inverse relationship between
microphone sensitivity and the distance from the mouth to the
microphone. Consequently, performers with a ''weaker'' sound
level cannot expect to hold the microphone too far away from
their mouth and compensate by turning up the amplifier
volume to increase the sound level as this can easily cause
echo or feedback. In contrast, performers with a ''louder''
sound level should not hold the microphone too close as this
can easily result in distortion by causing the amplifier system
to be overloaded.
! Furthermore, a large-diaphragm directional microphone has a
very distinct proximity effect. When the microphone is close to
the mouth, the bass response is strengthened as the distance
gets closer. Therefore, if a performer's sound is insufficient in
bass, they can hold the microphone closer and use the
proximity effect to help compensate for the lower bass level.
Conversely, if a performer's voice is too heavy in the bass
register, increasing the distance between the microphone and
their mouth will decrease the proximity effect and reduce the
bass response, thus making their voice become clearer and
brighter.
! It is recommended to keep the grille and sponge windscreen
clean to avoid any substance blocking the proximity effect of
the microphone.
Handheld Transmitter Handheld Transmitter
Disposal
2005-08-13
Dispose of any unusable devices or batteries
responsibly and in accordance with any applicable
regulations.
Disposing of used batteries with domestic waste is to
be avoided!
Batteries / NiCad cells often contain heavy metals such
as cadmium(Cd), mercury(Hg) and lead(Pb) that
makes them unsuitable for disposal with domestic
waste. You may return spent batteries/accumulators
free of charge to recycling centres or anywhere else
batteries/accumulators are sold.
By doing so, you contribute to the conservation of our
environment!
& IC - ID
THIS DEVICE COMPLIES WITH PART 74 OF THE FCC RULES AND
RSS-123 ISSUE1 OF CANADA. OPERATION IS SUBJECT TO THE
FOLLOWING TWO CONDITIONS:
(1) This device may not cause interference.
(2) This device must accept any interference, including interference
that may cause undesired operation of the device. This equipment
complies with FCC RF radiation exposure limits set forth for an
uncontrolled environment.