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PRO CO MONOFACE™ SERIES MODEL
INPUT
DIRECT
OUTPUT
GND
LIFT
MIC SPLITTER
MS-2
MS-2
ISO
OUTPUT
MS-2
MS-2
MIC SPLITTER
FEATURES
• Provides 2-Way Split for Low-Z Microphone
• Great for Musicians’ Monitoring and Recording
• ENG Uses Include Press Conferences and Speeches
• Connects with Standard Mic Cables
• High-Quality Transformer-Isolated Output
NEUTRIK
BACK OF UNIT FRONT OF UNIT
DESCRIPTION
The Pro Co Monoface MS-2 Mic
Splitter splits a signal from a lowimpedance microphone (or similar
source) into two outputs, enabling two
microphone preamplifiers to be fed from
one source. Some applications include
musicians’ on-stage monitoring, live
recording, ENG use at press conferences,
and videotaping of lectures, public
speeches, etc. It can also be used simply
as an isolation transformer for long
microphone lines feeding unbalanced
inputs, or for any audio signal up to 0
dBv (.775 volt). Transformer isolation in
such situations minimizes interference
from SCR lighting dimmers, radio
transmitters and 60 Hz AC power wiring.
The transformer-isolated feed retains the
advantage of common-mode noise
rejection inherent in the use of balanced
lines.
NEUTRIK NEUTRIK
• Rugged “Uni-box™” Construction for Protection and Shielding
The MS-2 is fitted with standard
3-pin XLR-type connectors for INPUT,
DIRECT OUTPUT, and ISOLATED
OUTPUT, so hookup requires only
standard microphone cables. The use of
the Pro Co MBT-1 transformer allows the
MS-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 transformer’s
dual electrostatic shields and GND/LIFT
switch provide isolation and buzz-free
operation in virtually any environment.
The MS-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
INPUT:
Female 3-pin XLR-type connector accepts
signal from low-impedance (150 ohm
nominal) microphone or similar source.
Input impedance (with 1.0 kohm loads
on DIRECT and both ISOLATED
OUTPUTS): approx. 500 ohm.
DIRECT OUTPUT:
Male 3-pin XLR-type connector wired in
parallel with INPUT provides signal to
feed mixer input.
ISOLATED OUTPUTS:
Male 3-pin XLR-type connector provide
floating transformer-isolated lowimpedance output to feed mixer inputs.
Recommended load impedances: 1.0
kohm.
GND/LIFTS:
GND position connects pin 1 of INPUT/
DIRECT OUTPUT to pin 1 of ISOLATED
OUTPUT. LIFT position “floats” ISOLATED OUTPUT. Used to reduce hum
and buzz by eliminating ground loops
and providing proper grounding for
various conditions.
MS-2/042492
PRO CO SOUND, INC./135 E. KALAMAZOO AVE./KALAMAZOO, MI 49007 USA PRO CO
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PRO CO MODEL MS-2 MIC SPLITTER
TYPICAL PERFORMANCE
All measurements made with 150 ohm source feeding INPUT and
1.0 kohm load on ISOLATED 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 65 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.
PHASE RESPONSE:
Less than -20 degrees @ 20 kHz (ref. 1.0 kHz).
RISE TIME:
Less than 4.5 microseconds (2.0 kHz square wave, 10%-90%).
INPUT IMPEDANCE:
Greater than 1050 ohm @ 1.0 kHz.
Greater than 1080 ohm @ 10 kHz.
Nominal source impedance is 150 ohm.
OUTPUT IMPEDANCE:
Less than 270 ohm @ 1.0 kHz.
Less than 300 ohm @ 10 kHz.
Nominal output impedance is 1.0 kohm.
VOLTAGE LOSS:
Less than 1.0 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 mixer (or
suitable power supply) connected to DIRECT OUTPUT.
ENGINEERING SPECIFICATIONS
The microphone signal splitting unit shall be suitable for interfacing
one (1) balanced or floating low-impedance (150 ohm nominal)
microphone or similar signal source to two (2) balanced or floating lowimpedance (1.0 kohm nominal) microphone preamplifier inputs. There
shall be a 3-pin female XLR-type connector for input from the source.
There shall be a parallel or direct output from a 3-pin male XLR-type
connector. There shall be a transformer-isolated low-impedance output
from a 3-pin male XLR-type connector. The transformer shall be a Pro
Co MBT-1 Microphone Bridging Transformer. The primary electrostatic
shield shall be connected to pin 1 of the source input and direct output
connectors. The secondary electrostatic shield shall be connected to
pin 1 of the transformer-isolated XLR output. There shall be a groundlift switch to allow the shields to be connected together or isolated 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
The microphone signal splitting unit shall be a Pro Co Monoface
MS-2 Mic Splitter.
THE PRO CO MBT-1 TRANSFORMER
The MBT-1 is a carefully designed, custom-built 1:1 microphone
bridging transformer whose characteristics are optimized for use with
balanced low-impedance microphones or similar sources.
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 secondary (output) windings reduce capacitive
coupling of ground-borne electrical noise between main and stage
monitor or recording mixers, eliminating annoying 60-Hz hum and buzz.
The source impedance of the MBT-1 is very similar to that of a lowimpedance microphone to ensure proper matching to the input circuitry
of the mixer. The result is clean transient response (no overshoot or
ringing) and low distortion even at low frequencies and high input
levels.
(123.8mm D x 111.1mm W x 44.4mm H).
PRO CO MODEL MS-2
1
2
INPUT
3
1
DIRECT
2
OUTPUT
3
BROWN
RED
GREY
MBT-1
TFMR
GND
LIFT
BLACK
ORANGE
YELLOW
ISO
OUT
DIMENSIONS
1
105.2mm
4.14"
2
3
4.375"
111.1mm
WEIGHT.......1.0 lb.
0.45 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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