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  • "I have grown to trust Radial products like no other company I know."

    Steve Stevens - Guitarist
    (Billy Idol)
    Steve Stevens
  • "Radial DIs can handle anything we throw at them and they work every single night. What else can you say?"

    Michael Davis - Keyboards
    (Dolly Parton, Vince Gill, Steve Wariner)
    Micheal Davis
  • "Radial DIs are awesome. Clear, warm and honest. Seriously great."

    Eric Fares - Keyboards
    (Sam Roberts Band, Juno award winner)
    Eric Fares

J-Iso & Pro-Iso Stereo +4dB to -10dB converters

Part No. R800 1025 ~ J-ISO with Jensen transformers
Part No. R800 1150 ~ Pro-ISO with Radial transformers

  • Converts balanced line level signals to unbalanced
  • Stereo signal path with set & forget level control
  • Transformer isolated to eliminate hum & buzz
  • J-Iso features Jensen™ transformers for optimal signal path

The Radial J-Iso and Pro-Iso are stereo line isolators designed to convert a professional +4dB line level balanced signal to an unbalanced -10dB consumer level device. This enables you to take the balanced output of a mixer and feed a consumer level recorder or audio input on a computer.

Two models are available:

J-Iso Part # R800-1025: The J-Iso employs a premium Jensen transformer for optimal signal transfer to minimize distortion and artefact. Full bandwidth performance makes the J-Iso ideal for music production.

Pro-Iso Part # R800-1150 The Pro-Iso employs a more cost effective transformer that focuses the energy in the voice range. This makes the Pro-Iso a great choice for sermons, news gathering and spoken voice.

The passive design begins with 100% discrete components throughout. A set & forget level control lets you attenuate the input signal to prevent it from overloading the destination device. Output connections include a stereo pair of ¼" connectors, a set of RCAs and a mini 3.5mm (1/8") for interfacing to a mini recorder or lap-top computer. Transformer isolation helps eliminate hum and buzz caused by ground loops while eliminating stray DC currents from flowing.

Construction begins with 14 gauge steel throughout utilizing Radial's unique bookend construction. This creates a protective zone around the connectors and controls for added durability. The steel construction also assists by shielding the transformers from outside magnetic fields. Inside, the J-Iso features an innovative I-beam skeletal insert that makes it virtually impossible to torque the PC board. This reduces potential stress which could cause premature solder joint failure.

Designed for full range applications, the J-Iso combines exceptional signal handling with the type of durability that has made Radial famous.


Balanced -10dB to +4dB Signal Driver


Two Channel Line Level Isolator


1x4 Distribution

J-Iso™ / Pro-Iso™ - Applications
Using the J-Iso to record a performance

Often, the available output on a professional console is balanced +4dB. This makes it difficult to feed a portable recorder. The J-Iso comes to the rescue with a simple interface and all of the connectivity you need.

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Using the J-Iso to convert a balanced signal

The J-Iso makes it easy to convert the balanced line level output from a preamp to a CD player or other consumer device. Transformer isolation further benefits by eliminating hum and buzz caused by ground loops.

Using the J-Iso to feed a computer

Computers are noisy at the best of times! The Radial J-Iso's premium Jensen transformers help eliminate buzz and hum while delivering exceptional audio. Adjust the set & forget level control on the J-Iso to set signal level.