9
Digital Frequency Agile UHF Hand-held Transmitter
Rio Rancho, NM – USA
Note: The attenuator should not be used as a level control. The Audio Level control inside the battery
compartment is the main level control. Adjust the attenuator only when the Audio Level control is turned
completely down and more headroom is still needed. Be sure to set the attenuator back to its original setting for
normal operation.
BASS FILTER
In addition to the tone controls, the UT700 also has a built in bass filter. This filter is fixed and cannot be adjusted or
defeated. Low frequency noise is much more of a problem with wireless microphones than with conventional micro-
phones. With a regular mic, low frequency wind noise, breath thumps or handling rumble can be filtered out at the
control board before the noise causes problems with the following electronics or speaker systems. But with a
wireless microphone, the electronics that will be overdriven are right in the wireless microphone. Filtering at the
control board is much too late. To solve this problem, the VariMic has a low frequency filter that is so sharp that it
can remove low frequency noise without affecting any wanted vocals. It consists of a 36 dB per octave filter circuit to
sharply remove low frequency noise below 75 Hz without affecting vocal fundamentals. The lowest operatic bass
voice fundamental is 82 Hz.
20
0dB
-20
-40
-60
10Hz
100Hz
1KHz
10KHz
VariMic Low Frequency Roll-off Filter
-3dB @ 71Hz
-20dB @ 50Hz
