PRO CO MULTIFACE™ SERIES MODEL IT-8
IT-8
8-CHANNEL ISOLATION
TRANSFORMER UNIT
FEATURES
•Isolates Unbalanced Line-Level Outputs
•True Floating Transformer Isolation
1
LINE IN
NEUTRIK
2
LINE IN
NEUTRIK
3
LINE IN
NEUTRIK
4
LINE IN
NEUTRIK
FRONT OF UNIT
ISO OUT
8
NEUTRI
K
GND
LIFT
ISO OUT
7
ISO OUT
6
GND
NEUTRI
K
LIFT
NEUTRI
K
GND
LIFT
ISO OUT
5
GND
NEUTRI
LIFT
K
BACK OF UNIT
DESCRIPTION
The Pro Co Multiface IT-8 Isolation
Transformer Unit provides eight
high-quality 1:1 line-level output
transformers for applications requiring
the high degree of electrical isolation
only transformers can provide. The
primary applications for the IT-8 are in
sound reinforcement systems where it
may be necessary to break ground loops
between pieces of equipment connected
with unbalanced lines. For instance, the
IT-8 can be used to float the unbalanced
outputs of an active crossover unit that
must drive long cables connected to
power amplifier inputs. Transformer
isolation in such situations minimizes
interference from SCR lighting dimmers,
radio transmitters and 60 Hz AC power
wiring. Furthermore, the common-mode
voltage range of a transformer 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.
The IT-8 is fitted with standard
3-pin XLR-type connectors for LINE IN
and ISO OUT, so hookup typically
requires only standard microphone
cables.
5
ISO OUT
4
LINE IN
NEUTRIK
NEUTRI
K
GND
LIFT
6
ISO OUT
3
LINE IN
NEUTRIK
NEUTRI
K
GND
LIFT
7
ISO OUT
2
LINE IN
NEUTRIK
NEUTRI
K
GND
LIFT
8
ISO OUT
1
LINE IN
NEUTRIK
NEUTRI
K
GND
LIFT
The use of the Pro Co LOT-1
ransformer allows the IT-8 to provide
floating, low-impedance outputs with
wide, flat frequency response, ultra-low
distortion, and no ringing or overshoot to
degrade transient response. The LOT-1’s
dual primary windings allow it to be
reconfigured for 1:2 operation if required,
providing 6 dB of voltage step-up.
Individual GND/LIFT switches provide
isolation and buzz-free operation in
virtually any environment.
The IT-8'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 IT-8 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
isolation system that combines
top-quality audio performance with an
economical price.
IT-8
•8 Channels in Single Rack Space
•Professional XLR Connectors
•Ideal for Portable and Permanent Sound
Systems
•Rugged "Uni–box™" Construction for
Super Strength and Shielding
CONTROLS
LINE IN:
Female 3-pin XLR-type connector accepts
signal from low-impedance (0 ohm
nominal) line-level source. Input
impedance (with 600 ohm load on ISO
OUT): approx. 680 ohm.
ISO OUT:
Male 3-pin XLR-type connector provides
floating transformer-isolated lowimpedance output to feed line-level
input. Recommended load impedance:
600 ohm
GND/LIFT:
GND position connects pin 1 of LINE IN
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.
IT-8/042198
PRO CO SOUND, INC./135 E. KALAMAZOO AVE./KALAMAZOO, MI 49007 USA/www.procosound.com PRO CO
PRO CO MODEL IT-8 ISOLATION TRANSFORMER UNIT
TYPICAL PERFORMANCE
All measurements made with 0 ohm source feeding LINE IN 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 output transformer isolation unit shall be suitable for
interfacing each of eight (8) unbalanced or electronically balanced
low-impedance (0 ohm nominal) line-level signal sources to one (1)
unbalanced, balanced, differential or floating low- or bridgingimpedance (600 ohm nominal) line level input. There shall be eight (8)
channels with features as follows:
There shall be a 3-pin female XLR-type connector for input from
the source. There shall be a transformer-isolated low-impedance output
from a 3-pin male XLR-type connector. The transformer shall be a Pro
Co LOT-1 Line Output Transformer. There shall be a ground-lift switch
to allow the input and output grounds (pin 1) 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, 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 output transformer isolation unit shall be a Pro Co Multiface
IT-8 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
balance 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.
PRO CO MODEL IT-8
1
LINE IN
2
3
**SHOWN WIRED 1:1. FOR 1:2 OPERATION PARALLEL ORN WITH BRN, YEL WITH RED.
DIMENSIONS
WEIGHT.......6.0 lbs.
2.59 kg.
SHIPPING
ONE OF EIGHT CHANNELS
PRO CO SOUND, INC./135 E. KALAMAZOO AVE./KALAMAZOO, MI 49007 USA/www.procosound.com PRO CO
GRN
BRN
BLU
RED
VIO
ORN
GRY
YEL
LOT-1
TRANSFORMER**
GND
LIFT
1
2
3
ISO
OUT
TOP VIEW
FRONT VIEW
SIDE VIEW
WEIGHT.......5.70 lbs.
2.73 kg.
19" / 482.6mm
4.75" / 120.7mm
1.75" / 44.5mm
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