Radial J-Iso Stereo Line Isolator

The Radial J-Iso Stereo Line Isolator is the professional solution for connecting balanced +4 dBu studio and live audio equipment to unbalanced -10 dBV consumer devices without sacrificing sound quality.

Whether you're feeding a laptop, portable recorder, broadcast interface, or other consumer audio hardware, the J-Iso delivers pristine signal conversion while eliminating the hum and buzz caused by ground loops. Featuring premium Jensen transformers, a passive design, and Radial's legendary road-ready construction, the J-Iso is an essential utility tool for studios, live sound engineers, broadcasters, and content creators who demand reliable, transparent signal transfer. Built around high-performance Jensen JT-11-YMPC transformers, the J-Iso preserves the full bandwidth and dynamic range of your audio while providing complete galvanic isolation between connected devices. Its passive circuitry requires no external power, making it exceptionally dependable for both permanent installations and mobile recording rigs. Convenient "set-and-forget" level controls allow you to optimize output levels to prevent overloading downstream equipment, while multiple output options—including dual 1/4", RCA, and 3.5 mm stereo connections—make it easy to integrate with virtually any consumer recording or playback device. Designed to withstand years of professional use, the J-Iso features Radial's rugged 14-gauge steel enclosure with innovative bookend construction and an internal I-beam frame that protects the circuit board from physical stress. The result is a compact, incredibly durable stereo line isolator that delivers exceptional sonic performance whether you're recording live performances, interfacing studio equipment, or eliminating noise in complex audio systems.

Radial J-Iso Stereo Line Isolator Features

• Converts professional balanced +4 dBu line-level signals to unbalanced -10 dBV consumer levels
• Premium Jensen JT-11-YMPC transformers for transparent audio performance
• Passive design requires no external power
• Stereo dual-mono signal path
• Transformer isolation eliminates hum, buzz, and ground loop noise
• Set-and-forget level controls for optimal signal matching
• XLR balanced inputs
• 1/4", RCA, and 3.5 mm TRS stereo unbalanced outputs
• Ground lift switch for additional noise elimination
• Full-bandwidth audio performance suitable for music production
• Heavy-duty 14-gauge steel enclosure with Radial bookend construction
• Internal I-beam support protects circuit board from mechanical stress
• Ideal for studio recording, live sound, broadcasting, podcasting, and computer audio interfacing

Radial J-Iso Stereo Line Isolator 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 Radial J-Iso comes to the rescue with a simple interface and all of the connectivity you need.
• Using the J-Iso to convert a balanced signal - The Radial 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.

Radial J-Iso Stereo Line Isolator Specifications

• Technical Specs:
  • Audio Circuit Type: Passive, transformer based
  • Number of Channels: Stereo (dual mono)
  • Frequency Response: 20Hz ~ 20KHz (+0dB/ -1.5dB)
  • Dynamic Range: 130dB
  • Maximum Input: +20dBu @ 1kHz/1% THD+N
  • THD + Noise: 0.001% @ 1kHz
  • Phase Deviation: 0.5° @ 100Hz; 1° @ 20Hz
  • CMRR: -58dB
  • Input Impedance: 1.3k Ohms, unbalanced
  • Output Impedance: 520 Ohms, balanced
• Features:
  • Transformer: Jensen JT-11-YMPC
  • Ground Lift: Disconnects XLR pin-1 at XLR input
  • XLR Configuration: AES standard (pin-2 hot)
  • Connectors: Balanced XLR-F in; ¼", RCA and 3.5mm TRS unbalanced outputs
• General:
  • Construction: 14 gauge steel chassis
  • Finish: Durable powder coat
  • Size: 8.4cm x 12.7cm x 4.8cm (3.3" x 5" x 2")
  • Weight: 0.7 kg (1.55 lbs)
  • Shipping Size: 10.2cm x 7.6cm x 16.5cm (4" x 3" x 6.5")
  • Shipping Weight: 0.87 kg (1.92 lbs)
  • Power: Passive, no power required
  • Conditions: For use in dry locations only between 5°C and 40°C

Radial J-Iso Stereo Line Isolator Includes

• Radial J-Iso Stereo Line Isolator
• User Guide
• Manufacturer Warranty