IT-8A
Pro Co Sound
IT-8A
Pro Co Sound IT-8A 8-Channel Isolation Transformer Unit
This multiface 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.
Its primary applications 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 unit is fitted with standard 3-pin XLR-type connectors for LINE IN and ISO OUT, so hookup typically requires only standard microphone cables. The use of the Pro Co LOT-1 transformer 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. Top quality 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 provides top-quality audio performance.
Its primary applications 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 unit is fitted with standard 3-pin XLR-type connectors for LINE IN and ISO OUT, so hookup typically requires only standard microphone cables. The use of the Pro Co LOT-1 transformer 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. Top quality 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 provides top-quality audio performance.
Product Weight: 6.0 lbs
Dimensions: 19"W x 4.75"D x 1.75"H (1RU)
Technical Tools
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Manufacturer Specs
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: 0Ω
Output Impedance
Less than 120 ohm @ 1.0 kHz
Less than 120 ohm @ 10 kHz
Nominal output impedance: 600Ω
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
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. 680Ω
ISO OUT: Male 3-pin XLR-type connector provides floating transformer-isolated low-impedance output to feed line-level input.
Recommended load impedance: 600Ω
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.
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: 0Ω
Output Impedance
Less than 120 ohm @ 1.0 kHz
Less than 120 ohm @ 10 kHz
Nominal output impedance: 600Ω
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
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. 680Ω
ISO OUT: Male 3-pin XLR-type connector provides floating transformer-isolated low-impedance output to feed line-level input.
Recommended load impedance: 600Ω
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.