3. Unpacking The Equipment
This package should contain, in addition to this manual:
1 x
MIC-IT
1 x
IEC Mains lead
If any items are missing or damaged please inform your supplier immediately.
Ensure that the MIC-IT has been supplied for the correct mains/line voltage for your country.
4. Controls and Connectors
Mic Inputs
3 pin female XLRs, electronically balanced.
Pin 1
Ground
Pin 2
Hot (Phase)
Pin 3
Cold (Non-phase)
Input Gain
Individual multiturn adjustments for channel gain. Nominal gain range 33 to
75dB.
48V Phantom Switch A three position switch allowing 48V phantom power to be applied to one, or
both, of the microphones.
80Hz Filter Switch
A three position switch allowing an 80Hz high-pass filter to be applied to one, or
both, of the microphone channels.
Output Mode Switch A three position switch selecting one of three output modes. See section 5 for
details.
Line Outputs
3 pin male XLRs, electronically balanced. Balanced outputs may be unbalanced
without affecting gain by linking pins 1 and 3 inside the mating plug.
Pin 1
Ground
Pin 2
Hot (Phase)
Pin 3
Cold (Non-phase)
Power LED
Lights continuously to confirm correct operation of power supply.
Mains Fuse
20mm antisurge mains fuse.
100mA(T) for 230V units
250mA(T) for 115V units
DISCONNECT MAINS BEFORE ATTEMPTING TO CHANGE FUSE.
Mains
IEC male connector.
5. Operation
Refer to section 4 for a description of the controls and connectors.
48V Phantom Power
Some microphones contain an internal pre-amplifier which requires a phantom power voltage to
operate. The microphone documentation will state if this is so and IT IS VITAL TO CHECK THE
MANUFACTURER’S INFORMATION BEFORE APPLYING PHANTOM POWER. Applying phantom power to
non-phantom-powered microphones may cause damage and ProAVM can accept no responsibility for
such damage. The front panel switch allows phantom power to be applied via input A only, inputs A
and B, or neither input (phantom off).
80Hz High-pass Filter
To reduce the effects of hum and rumble in electrically or physically noisy environments, a sharp 80Hz
high-pass filter may be applied to substantially attenuate signals below that frequency. The front panel
switch assigns filtering to input A only, inputs A and B, or neither input (filter off).
Output Mode Selection
The MIC-IT supports three different output modes for maximum versatility, and these are selectable via
a front panel three position switch.
STD mode -
Two individual channels, with inputs A and B feeding outputs A and B respectively.
MON mode - Mono operation, with a mono mix of inputs A and B fed to both outputs. Gain is
automatically adjusted such that, with identical levels on inputs A and B, no level change
is experienced when switching from STD to MON mode.
S+D mode -
Sum and difference mode, with the sum (input A + input B) signal on output A and the
difference (input A - input B) signal on output B. Gain is automatically adjusted such that,
with identical levels on inputs A and B, no level change is experienced on the sum
output when switching from STD to S+D mode.
Connections
Inputs & Outputs
Refer to section 4 of this manual for the pin assignments of the XLR connectors. The mating (cable)
connectors generally have the pin numbers moulded into their body close to the pins themselves. For
unbalanced use, connect pin 3 to pin 1 inside the mating connector and connect the signal to pin 2,
with pin 1/3 as ground. To achieve specified performance, leads should be of quality screened cable
and not exceed 10m in length.
Gain Settings
Apply the expected input signal level to the MIC-IT. Monitor the output and adjust the gain control
(clockwise to increase gain) to give the level required.
6. Specifications
Inputs Electronically
balanced, input impedance >5kohm
Maximum input level
-6dBu
Input CMRR
> 60dB
Outputs Electronically
balanced
Maximum output level
+26dBu (10kohm load), +25.5dBu (600ohm load)
Nominal gain range
33dB to 75dB
Equivalent input noise
-129dB (RMS, 20Hz-22kHz, 60dB gain, 150ohm source)
Harmonic distortion
0.005% (1kHz THD, 40dB gain, +8dBu O/P)
Frequency response
<±0.1dB (20Hz-20kHz)
Selectable high pass filter
-3dB at 80Hz, -12dB/octave below
Power supply
230V AC (default) or 115V AC
Power consumption
7VA
Inrush current
<1A
Dimensions (excluding connectors)
294mm x 114mm x 44mm
Fixing centres
4 x 5mm hole on 276mm x 74mm rectangle
Weight
1.0kg unpacked, 1.2kg packed