Dual Passive Isolator with Custom Modified Isolation Transformer for Line Level Signals

UNiKA PRO-IS2 is a professional Passive Iso designed to convert two separate Line Level signals to 2 independent transformer-isolated balanced outputs.

In this way, a signal from a  submixer, monitor mixer, pre-amp or other mains powered audio source can be connected to mixers, recorders, powered speakers and outboard effects in a way that isolates ground loop noise or leakage. 

As PRO-IS2 is a passive device, no batteries or other power supplies are required and UNiKA PRO’s custom modified audio isolation transformer ensures pristine audio quality.

UNiKA PRO-IS2 is equally at home on stage or in the studio with a rugged steel casing, full-length anti-slip mat and recessed connectors.


CH1 and CH2 INPUT—XLR /TRS Combi connects outputs from a mixer, pre-amp or other line level source to the PRO-IS2. CH1 and CH2 have separate audio paths so can be used independently.

REV — reverses the polarity of CH2. If input is wired pin-3 hot. Pressing REV changes this to pin-2 hot.

CH1 and CH2 OUTPUT—XLRs connect the transformer-isolated balanced audio signal to monitor mixers, recorders, powered speakers, outboard effects and other line level devices using a standard  XLR cable.

GND/LIFT— Pressing GRND-1 breaks the ground at the output of the CH1 transformer to eliminate hum and noise caused by  ground loops. GRND-2 breaks the ground at the output of CH2.

Rugged Steel Chassis—with Anti-Scratch Paint.

Anti-Slip Mat— full-length, flexible plastic pad cushions and stabilises the PRO-IS2




System Specifications

  • Circuit Principle: Passive with Transformer Balanced Output
  • Input Connector: 2 X Combi Jacks
  • Polarity Reverse CH2: Push button
  • Input Impedance: 4,7 kOhm balanced / 10 kOhm unbalanced
  • Output Impedance: 600 Ohm
  • Maximum Input Level before clipping: +22dB
  • Maximum Output Level: +22dB
  • Output connector: 2 X Male XLR through ISO Transformer
  • Output GND/LIFT switches: 2 X separate puch buttons
  • Frequency Response: 20Hz-20kHz, -0.3/+0.1dB
  • S/N Ratio @20Hz-20kHz un-weighted: Greater than 120dB
  • T.H.D @1kHz 0dBV Output: Less than 0.02%
  • Type of ISO Transformer: 1.25:1
  • Chassis: 1.6mm/1.2mm steel
  • Finish: Anti-scratch paint
  • Dimension (W X D X H): 78 X 124 X 46mm
  • Unit Weight: 0,62 kg



Est. 1985. Strictly Confidential...

UNiKA has manufactured high-quality audio products for internationally-respected brands for over 35 years. So you may already own, love, and depend on a quality product proudly-designed and built in Taiwan by UNiKA. We would love to name names but as we have promised confidentiality our lips are sealed!

We have a passion for great-sounding gear. So we decided to start our own brand to give our team the freedom to build and market their exceptional designs. Enter UNiKA Pro!

That was 2018 and there is now a comprehensive range of top-spec Dante I/O interfaces—the NBB Series—and an entry-level range of budget DI's—the Stage Series. Go check them out! Based on customer feedback, dealers and distributors asked us to make a flagship DI series with the emphasis on musicality but without a boutique price-tag. So how did we do this? It started with the transformer….


Custom Modified Transformer...

At the heart of  the PRO-IS2 is the UNiKA Pro EI9AE3R3, 1.25:1 audio isolation transformer. This is a modified, custom design with a special copper foil layer and dedicated grounding layer. It has been specially-selected to enhance musicality by producing a sound rich in harmonics.

Grounding interference and leakage caused by potential differences are minimised and low impedance balanced outputs allow long cable runs with the very best audio quality.


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