Pro Co MS82 Specifications

PRO CO MULTIFACE™ SERIES MODEL MS-82

MS-82

8-CHANNEL MICROPHONE
SPLITTER

FRONT OF UNIT

MICROPHONE INPUT

DIRECT OUTPUT

CHANNELS

1 4

GND/LIFT
1-2-3-4

ISOLATED OUTPUT 1

MICROPHONE INPUT

DIRECT OUTPUT

CHANNELS

THRUTHRU

5 8

GND/LIFT
5-6-7-8

ISOLATED OUTPUT 1

MS-82MS-82

FEATURES

• Provides 2-Way Split for Low-Z
Microphones

• 8 Splitter Channels in Single Rack Space

• Allows Assembly of Economical
Expandable Splitting System

• Great for Musicians’ Monitoring, Remote
Recording and Broadcast

• Connects with Phoenix COMBICON™
Plug-in Screw Connectors

• High-Quality Transformer-Isolated
Outputs

BACK OF UNIT

DESCRIPTION

The Pro Co Multiface MS-82 Eight­Channel Mic Splitter splits the signals
from each of eight low-impedance
microphones (or similar sources) into
two outputs, enabling two microphone
preamplifiers to be fed from one source.
The primary application for the MS-82 is
in large sound reinforcement systems,
where the P.A. system microphones must
also be fed to a stage monitor system, or
a broadcast or remote recording mixer.
In such complex systems grounding
problems can cause both unacceptable
noise levels and severe shock hazards.
Transformer isolation in such situations
minimizes interference from SCR lighting
dimmers, radio transmitters and 60 Hz
AC power wiring. The transformer­isolated feeds retain the advantage of
common-mode noise rejection inherent in
the use of balanced lines.

The MS-82 is fitted with Phoenix
COMBICON plug-in screw connectors
for MIC IN, DIRECT OUT, and ISO OUT
so hookup requires only bare conductors
and a screwdriver.

The use of the Pro Co MBT-1
transformer allows the MS-82 to provide
a floating, low-impedance output with
wide, flat frequency response, ultra-low
distortion, and no ringing or overshoot to
degrade transient response.

The transformer’s double
electrostatic shield and GND/LIFT
switch provides isolation and buzz-free
operation in virtually any environment.

The MS-82's rugged 16–gauge steel
and aluminum "Uni–box™" construction
enclosure is finished in a durable black
texture powder coat finish with black
anodized aluminum side channels. Easy–
to–read control graphics are incorporated
into the Lexan® front and back panel
overlays. Inside, the specially designed
transformers combine superb audio
quality with unsurpassed noise rejection.

The MS-82 can be mounted in any
standard 19" (482.6mm) rack. Top­quality connectors and switches provide
trouble-free service even in abusive
situations such as remote broadcast and
recording operations. The rack-mounting
design allows the user to assemble a
conveniently packaged expandable
splitting system that combines top­quality audio performance and isolation
with an economical price.

• Rugged "Uni-Box™" Construction for
Super Strength and Shielding

CONTROLS

MICROPHONE INPUT

Phoenix COMBICON plug-in screw
connector accepts signals from
low-impedance (150 ohm nominal)
microphones or similar sources. Input
impedance (with 1.0 kohm loads on
DIRECT and ISO OUT) is approximately
333 ohm.

DIRECT OUTPUT:

Phoenix COMBICON plug-in screw
connector wired in parallel with MIC IN
provides signal to feed mixer input.

ISOLATED OUTPUT:

Phoenix COMBICON plug-in screw
connector provides floating transformer­isolated low-impedance output to feed
mixer inputs. Recommended load
impedances: 1.0 kohm.

GND/LIFTS:

GND position connects pin 1 of MIC IN/
DIRECT OUT to pin 1 of ISO OUT. LIFT
position “floats” ISO OUT. Used to
reduce hum and buzz by eliminating
ground loops and providing proper
grounding for various conditions.

MS-83/042198

PRO CO SOUND, INC./135 E. KALAMAZOO AVE./KALAMAZOO, MI 49007 USA/www.procosound.com PRO CO

PRO CO MODEL MS-82 MICROPHONE SPLITTER

TYPICAL PERFORMANCE ENGINEERING SPECIFICATIONS

All measurements made with 150 ohm source feeding MIC IN and

1.0 kohm load on ISO OUT 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.

The microphone signal splitting unit shall be suitable for interfacing
each of eight (8) balanced or floating low-impedance (150 ohm
nominal) microphones or similar signal sources to two (2) balanced or
floating low-impedance (1.0 kohm nominal) microphone preamplifier
inputs. There shall be eight (8) channels with features as follows:

There shall be a Phoenix COMBICON™ plug-in screw connector
for input from the source. There shall be a parallel or direct output from
a Phoenix COMBICON plug-in screw connector. There shall be one (1)
transformer-isolated low-impedance output from a Phoenix
COMBICON plug-in screw connector. The transformer shall be a
Pro Co MBT-1 Microphone Bridging Transformer. The primary
electrostatic shield shall be connected to pin 'G' of the source input and
direct output COMBICON connectors. The secondary electrostatic
shield shall be connected to pin 'G' of the transformer-isolated
COMBICON connector output. There shall be a ground-lift switch for
the isolated output to allow the secondary shield to be connected to the
primary shield 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, 1/8"
black anodized aluminum front plates, back plates and side channels.
Control functions shall be identified by a printed Lexan® front and back
panel overlay. Switches shall be of the miniature “rocker” type and shall
be recessed. The enclosure shall be provided with 2 miniature handles
mounted on the front plate. The enclosure shall be suitable for standard
19" EIA rack mounting. The dimensions of the unit shall be approxi­mately 4-3/4" D by 19" W by 1-3/4" H. (120.7mm D by 482.6mm W by

44.5mm H).

The microphone signal splitting unit shall be a Pro Co Multiface
MS-82 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.

PRO CO MODEL MS-82

G

MIC

+

IN

–

G

DIRECT

+

–

DIMENSIONS

ONE OF EIGHT CHANNELS

BROWN

PRO CO SOUND, INC./135 E. KALAMAZOO AVE./KALAMAZOO, MI 49007 USA/www.procosound.com PRO CO

RED

GREY

MBT-1
TFMR

GND
LIFT

BLACK

ORANGE

YELLOW

ISO

OUT

G

+

–

TOP VIEW

FRONT VIEW

SIDE VIEW

WEIGHT...... 4.70 lbs.

2.14 kg.
SHIPPING

WEIGHT.......5.0 lbs.

2.25 kg.

19" / 482.6mm

4.75" / 120.7mm

1.75" / 44.5mm