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PRO CO MONOFACE™ SERIES MODEL
OUTPUT
INPUT 1
REV
POL
INPUT 2
MIC COMBINER
MC-2
MC-2
MC-2
MC-2
MIC COMBINER
FEATURES
• Combines 2 Low-Z Microphone Signals
• Ideal for Recording and Live Sound
• Use for Backup Microphones at Press Conferences and Speeches
• Connects with Standard Mic Cables
• Polarity Reversing Switch Corrects Phase Cancellation
• High-Quality Transformer-Isolated Output
NEUTRIK NEUTRIK
BACK OF UNIT FRONT OF UNIT
NEUTRIK
• Rugged “Uni-box™” Construction for Protection and Shielding
DESCRIPTION
The Pro Co Monoface MC-2 Mic
Combiner passively combines the signals
from two low-impedance microphone (or
similar sources) into a single output. It is
a handy “band-aid” for situations where
the number of microphones required
exceeds the number of mixer channels
available, but separate equalization and
level control for every microphone is not
required. In a musical or recording
situation, the MC-2 can combine mics
from sources like dual bass drums,
percussion “toys”, stereo guitar amps,
etc. Commercial sound uses include
combining dual mics on a public speaker
for redundancy and handling extra mics
for audience participation at meetings.
The MC-2’s transformer isolation
minimizes interference from SCR lighting
dimmers, radio transmitters and 60 Hz
AC power wiring, retaining the advantages of common-mode noise rejection
inherent in the use of balanced lines.
The MC-2 is fitted with standard 3-pin
XLR-type connectors for INPUT 1 and 2
and OUTPUT, so hookup requires only
standard microphone cables. One input
is provided with a REV/POL switch to
change its polarity. This is very useful for
correcting acoustical or electrical phase
cancellation problems such as poor mic
placement and miswired cables. The use
of the Pro Co MBT-2 transformer allows
the MC-2 to provide a floating, lowimpedance output with wide, flat
frequency response, ultra-low distortion,
and no ringing or overshoot to degrade
transient response.
The MC-2’s ruggedly constructed
“Uni-box™” enclosure is formed of
extruded aluminum side channels and
16-gauge steel top, bottom and end plates
and is designed to protect switches and
connectors from accidental damage. The
use of steel also provides excellent
magnetic shielding for the transformer
from 60Hz AC hum fields. Top-quality
connectors and switches provide troublefree service even in abusive situations
such as remote broadcast and recording
operations. The uniquely slotted side
channels allow for stacking on top or
strapping side-to-side of virtually any
number of Pro Co Monoface devices
using the Uni-box™ construction.
CONTROLS
INPUTS:
Female 3-pin XLR-type connectors accept
signals from low-impedance (150 ohm
nominal) microphones or similar sources.
Input impedance (with 1.0 kohm load on
OUTPUT): approx. 150 ohm.
REV/POL:
Reverses polarity of INPUT 2 to correct
for out-of-phase microphone or cable
wiring, compensate for phase cancellation from acoustical conditions or mic
placement, or provide special effects.
OUTPUT:
Male 3-pin XLR-type connector provides
floating transformer-isolated lowimpedance output to feed mixer input.
Recommended load impedance: 1.0
kohm.
MC-2/042492
PRO CO SOUND, INC./135 E. KALAMAZOO AVE./KALAMAZOO, MI 49007 USA PRO CO
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PRO CO MODEL MC-2 MIC COMBINER
TYPICAL PERFORMANCE
All measurements made with 150 ohm sources feeding INPUTS
and 1.0 kohm load on OUTPUT to simulate typical “real world”
microphone and mic preamp. 0 dBv ref. = .775 volt.
FREQUENCY RESPONSE:
20 Hz-20 kHz, +/- .5 dB @ -15 dBv output.
-3 dB @ approximately 230 kHz.
TOTAL HARMONIC DISTORTION:
Less than .03% 20 Hz-20 kHz @ -30 dBv output.
Less than .1% 30 Hz-20 kHz @ -15 dBv output.
Less than .25% 20 Hz-20 kHz @ -15 dBv output.
INPUT IMPEDANCE:
Greater than 235 ohm @ 1.0 kHz.
Greater than 285 ohm @ 10 kHz.
Nominal source impedance is 150 ohm.
OUTPUT IMPEDANCE:
Less than 180 ohm @ 1.0 kHz.
Less than 185 ohm @ 10 kHz.
Nominal output impedance is 1.0 kohm.
VOLTAGE LOSS:
Less than 7.0 dB @ 1.0 kHz.
MAXIMUM INPUT LEVEL FOR 1% THD:
0 dBv @ 20 Hz.
+4 dBv @ 30 Hz.
+8 dBv @ 50 Hz.
NOTE: Phantom power (if required) must be supplied by suitable power
supply connected directly to microphones before MC-2 INPUTS.
ENGINEERING SPECIFICATIONS
The microphone signal combining unit shall be suitable for
interfacing two (2) balanced or floating low-impedance (150 ohm
nominal) microphone sor similar signal sources to one (1) balanced or
floating low-impedance (1.0 kohm nominal) microphone preamplifier
input. There shall be two (2) 3-pin female XLR-type connectors for
inputs from the sources. There shall be a transformer-isolated lowimpedance output from a 3-pin male XLR-type connector. The
transformer shall be a Pro Co MBT-2 Microphone Bridging
Transformer. There shall be a polarity-reversing switch to interchange
the connections between pins 2 and 3 of input connector 2 and the
transformer winding as required.
The enclosure shall be constructed in the Pro Co “Uni-box™”
design with 16-gauge steel black zinc finish top and bottom plates,
16-gauge black texture powder coated steel end plates and black
anodized aluminum side channels. Control functions shall be identified
by a printed Lexan® top panel overlay. Switches shall be of the
miniature “rocker” type and shall be recessed. The enclosure shall be
provided with two (2) miniature handles at each end (front and back)
and four (4) non-conductive feet. The dimensions of the unit shall be
4.875" D x 4.375" W x 1.75" H (123.8mm D x 111.1mm W x 44.4mm H).
The microphone signal combining unit shall be a Pro Co Monoface
MC-2 Mic Combiner.
THE PRO CO MBT-2 TRANSFORMER
The MBT-2 is a carefully designed, custom-built 1:1:1 microphone
bridging transformer whose characteristics are optimized for use with
balanced low-impedance microphones or similar sources (including the
Pro Co DB-1 and DB-4 Direct Boxes).
PRO CO MODEL MC-2
1
INPUT
2
1
3
1
INPUT
2
2
3
VIO/WHT
BRN
RED
BLK
GRN
BLU/WHT
REV
POL
BLK/WHT
WHT
YEL
MBT-2
TFMR
Special winding techniques and a high-permeability (80% nickel)
core lamination preserve full frequency response while minimizing
signal losses and other “loading” effects. Separate electrostatic shields
for primary (input) and each secondary (output) winding reduce
capacitive coupling of ground-borne electrical noise between main,
stage monitor and recording or broadcast feed mixers, eliminating
annoying 60-Hz hum and buzz. The source impedance of the MBT-2 is
very similar to that of a low-impedance microphone to ensure proper
matching to the input circuitry of the mixers. The result is clean
transient response (no overshoot or ringing) and low distortion even at
low frequencies and high input levels.
OUTPUT
DIMENSIONS
105.2mm
4.14"
1
2
3
4.375"
111.1mm
WEIGHT.......1.125 lb.
0.51 kg.
SHIPPING
WEIGHT.......2.0 lbs.
0.91 kg.
4.875"
123.8mm
1.75"
44.4mm
PRO CO SOUND, INC./135 E. KALAMAZOO AVE./KALAMAZOO, MI 49007 USA PRO CO
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