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PRO CO MONOFACE™ SERIES MODEL
PARALLEL
LINE IN/OUT
ISO
OUT
GND
LIFT
ISO
OUT
ISOLATION
TRANSFORMER
IT-1
IT-1
IT-1
IT-1
ISOLATION TRANSFORMER
FEATURES
• True Floating Transformer Isolation for Unbalanced Line-Level
Outputs
• Input, Output and Loop-Thru XLR and 1/4" (6.3mm) Phone Jack
Connectors
• Can Be Used As Line-Level Direct Box
• Ideal for Portable and Permanent Sound Systems
NEUTRIK
BACK OF UNIT FRONT OF UNIT
DESCRIPTION
The Pro Co Monoface IT-1 Isolation
Transformer Unit provides an easy-to-use,
high-quality solution for interface problems
that demand the high degree of electrical
isolation that only a transformer can
provide. Transformer isolation minimizes
interference from SCR lighting dimmers,
radio transmitters and 60 Hz AC power
wiring with a common-mode voltage range
that makes it far more forgiving of
improper connections or fault conditions
than any “active”, “electronic” or
“differential” transformerless circuit. This
makes transformer-floated outputs essential
for “goof-proofing” portable sound
reinforcement systems and installations.
Sound system technicians can use the
IT-1 to break ground loops between pieces
of equipment connected with unbalanced
lines (for instance, to float the unbalanced
output of a mixer that must drive long
cables connected to power amplifier
inputs). For musicians, the IT-1 is a linelevel direct box for connecting line-level
sound modules, samplers and the like to
“live” or recording mixers, providing a
floating output without the voltage stepdown of a high-to-low impedance
conversion. For broadcast and ENG, the
IT-1 is a handy unit for deriving a remote
feed from a press conference or meeting
room public address system.
NEUTRIK
NEUTRIK
in parallel with two 3-conductor 1/4"
(6.3mm) phone jacks for LINE IN/OUT
provide nearly universal loop-through
capability. Parallel jack and male XLR
connectors deliver the ISO OUT to balanced
or unbalanced loads. The use of the Pro Co
LOT-1 transformer allows the IT-1 to
provide a floating, low-impedance output
with wide, flat frequency response, ultralow distortion, and no ringing or overshoot
to degrade transient response. (Note: The
LOT-1’s dual primary windings allow an
IT-1 to be rewired for 1:2 operation if
required, providing 6 dB of voltage stepup.) The GND/LIFT switch provides
isolation and buzz-free operation in
virtually any
environment.
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 trouble-free 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.
• Rugged “Uni-box™” Construction Shields and Protects
Male and female XLR-type connectors
The IT-1’s “Uni-box™ construction”
CONTROLS
PARALLEL LINE IN/OUT:
Male and female 3-pin XLR-type
connectors wired in parallel to two
3-conductor 1/4" (6.3mm) phone jacks
accepts signal from low-impedance (0 ohm
nominal) line-level source to provide
simple connection and loop-through for
any combination of XLR connectors and 2or 3-conductor phone plugs. Input impedance (with 600 ohm load on ISO OUT):
approx. 680 ohm.
ISO OUT:
Male 3-pin XLR-type connector or
3-conductor 1/4" (6.3mm) phone jack
provides floating transformer-isolated lowimpedance output to feed line-level input.
Recommended load impedance: 600 ohm.
GND/LIFT:
GND position connects pin 1 (and jack
sleeve) of LINE IN/OUT to pin 1 (and jack
sleeve) 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.
IT-1/042392
PRO CO SOUND, INC./135 E. KALAMAZOO AVE./KALAMAZOO, MI 49007 USA PRO CO
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PRO CO MODEL IT-1 ISOLATION TRANSFORMER
TYPICAL PERFORMANCE
All measurements made with 0 ohm source feeding LINE IN/OUT
and 600 ohm load on ISO OUT to simulate typical “real world” source
and load. LOT-1 transformers configured for 1:1 operation. 0 dBv ref. =
.775 volt.
FREQUENCY RESPONSE:
20 Hz-20 kHz, +/- .5 dB @ 0 dBv output.
-3 dB @ approximately 85 kHz.
TOTAL HARMONIC DISTORTION:
Less than .25% 20 Hz-20 kHz @ 0 dBv output.
Less than .5% 30 Hz-20 kHz @ +18 dBv output.
Less than 1% 20 Hz-20 kHz @ +18 dBv output.
PHASE RESPONSE:
Less than -3 degrees @ 20 kHz (ref. 1.0 kHz).
RISE TIME:
Less than 4.5 microseconds (2.0 kHz square wave, 10%-90%).
Phase response and rise time measurements are essentially those of
the driving amplifier used rather than those of the LOT-1 transformer.
INPUT IMPEDANCE:
Greater than 680 ohm @ 1.0 kHz.
Greater than 680 ohm @ 10 kHz.
Nominal source impedance is 0 ohm.
OUTPUT IMPEDANCE:
Less than 120 ohm @ 1.0 kHz.
Less than 120 ohm @ 10 kHz.
Nominal output impedance is 600 ohm.
VOLTAGE LOSS:
Less than 2.0 dB @ 1.0 kHz.
MAXIMUM INPUT LEVEL FOR 1% THD:
+20 dBv @ 20 Hz.
+24 dBv @ 30 Hz.
+30 dBv @ 50 Hz.
ENGINEERING SPECIFICATIONS
The signal-splitting/transformer isolation unit shall be suitable for
interfacing one (1) unbalanced or electronically balanced lowimpedance (0 ohm nominal) line-level signal source to one (1)
unbalanced, balanced, differential or floating low- or bridgingimpedance (600 ohm nominal) line level input. There shall be 3-pin
male and female XLR-type connectors wired in parallel with (2) 3conductor 1/4" (6.3mm) phone jacks for input from the source and
loop-through (direct) output. There shall be a transformer-isolated lowimpedance output from a 3-pin male XLR-type connector wired in
parallel with a 3-conductor 1/4" (6.3mm) phone jack. The transformer
shall be a Pro Co LOT-1 Line Output Transformer. The phone jacks
shall be of the insulated-bushing type. The XLR connectors shall be
wired with pin 2 “in-phase” (paralleled to phone jack tip) and pin 3 “antiphase” (paralleled to phone jack ring). There shall be a ground-lift
switch to allow the the input/loop-through and output grounds (pin 1
and phone jack sleeve) 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 output transformer isolation unit shall be a Pro Co Monoface
IT-1 Isolation Transformer Unit.
THE PRO CO LOT-1 TRANSFORMER
The LOT-1 is a carefully designed, custom-built line output
transformer which is very useful in a variety of applications requiring
truly floating transformer isolation of unbalanced or electronically
balanced line-level outputs.
The LOT-1 consists of four windings, with the primaries connected
in series for 1:1 operation or in parallel to provide 1:2 (step-up)
operation into 600 ohm loads. Its 48% nickel core lamination optimizes
it for use with zero-ohm sources such as op-amp-based outputs. The
LOT-1 provides a broad-band, low-distortion floating output with
excellent transient response and minimal insertion loss.
(123.8mm D x 111.1mm W x 44.4mm H).
PRO CO MODEL IT-1
1
2
3
1
2
PARALLEL
3
LINE
IN/OUT
GND
LIFT
BRN
GRN
RED
BLU
ORN
VIO
YEL
GRY
LOT-1
TRANSFORMER
JACKS: ISOLATED BUSHING TYPE
1
2
3
ISO
OUT
105.2mm
DIMENSIONS
4.14"
4.375"
111.1mm
WEIGHT.......1.0 lb.
0.45 kg.
SHIPPING
WEIGHT.......2.0 lbs.
0.91kg.
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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