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7. Optional Accessories
Different desktop microphone units and microphones
ZA 2 Transparent cover for the operating
controls and indicators . . . . . . . . . . . . . . . . . . . . . . . . Order # 453.005
ZE 100 Retrofit item for earth-fault control . . . . . . . . . . . . . . Order # 453.781
8. Technical Specifications
Frequency response . . . . . . . . . . . . . 55 - 18,000 Hz
Distortion (THD) . . . . . . . . . . . . . . . . ≤ 0.08%
Signal to noise ratio . . . . . . . . . . . . . -75 dB
Microphone inputs
Characteristics. . . . . . . . . . . . . . . . . . electronically balanced
Input impedance. . . . . . . . . . . . . . . . 600 Ω
Pre-amplification . . . . . . . . . . . . . . . 1 - 100 mV, adjustable
Phantom power . . . . . . . . . . . . . . . . 0 - 24 V, adjustable for Mic 1 and 2,
Connection . . . . . . . . . . . . . . . . . . . . 3-pin XLR
Priority control . . . . . . . . . . . . . . . . . Ducking function on Mic 1 and 2,
0 - -40 dB attenuation, adjustable
first priority for Mic 1 and
second priority for Mic 2
over the other inputs
• The source itself has a hum
• The input wiring passes near AC mains
wiring
• Defect in the unbalanced wiring
• Determine if the source is defective
or wired incorrectly and correct
• Reroute the input wiring
• Balanced connection to the input
source
Hum in the output
• The source itself has a hum
• The input wiring passes near AC mains
wiring or wiring to lighting dimmers
• There is pickup of RFI (radio frequency
interferences) from TV transmissions. This
kind of interference sounds like power
line related buzz, but tends to change in
character every few seconds due to
changes in the video image.
• Determine if the source is defective
or wired incorrectly and correct
• Reroute the input wiring
• Try different cabling or grounding
techniques. Try to solve the problem
by using the 0.1 µF capacitor connected
to bypass the shield. Try different
routing of input and power cables.
• The source output is set too high and the
gain control of the amplifier is turned way
down to compensate.
• The source itself is distorted.
• Reduce the source output level and
increase the setting of the gain
control of the amplifier.
• Try a different source and/or have the
source repaired.
Distortion in the
output
Buzz in the output
Problem Possible Cause Solution