Radial Engineering Pro-ISO +4/-10 dB Stereo Line Isolator

Product #96258 | SKU RA-PROISO | Radial
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Our Price $369.00
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  • Convert Balanced Line to Unbalanced
  • Transformer Isolated Eliminates Hum/Buzz


The Radial Engineering Pro-ISO +4/-10 dB Stereo Line Isolator is designed to convert a professional +4 dB line-level balanced signal to an unbalanced -10 dB 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.

The Pro-ISO employs a transformer that focuses the energy in the voice range making it a suitable choice for sermons, news gatherings, and spoken voice.

The passive design employs 100% discrete components throughout. A set-and-forget level control lets you attenuate the input signal to prevent it from overloading the destination device. Output connections include a stereo pair of 1/4" connectors, a set of RCAs and a mini 3.5mm TRS for interfacing to a mini recorder or laptop computer. Transformer isolation helps eliminate hum and buzz caused by ground loops while eliminating stray DC currents from flowing.

Utilising Radial's bookend construction, the Pro-ISO has 14-gauge steel construction throughout. 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.


Circuit Type Passive, Transformer Based
Number of Channels Stereo (Dual Mono)
Frequency Response 20 Hz to 18 kHz (+0 dB/ -3 dB)
Dynamic Range 130 dB
Maximum Input +20 dBu at 1 kHz / 1% THD+N
THD + Noise 0.005% at 1 kHz
Deviation Phase: 1.5° at 100 Hz; 3° at 20 Hz
CMRR -76 dB
Input Impedance 1.3 Kilohms
Output Impedance 1.9 Kilohms
Transformer Radial Transformer
Ground Lift Disconnects XLR Pin-1 at XLR Input
XLR Configuration AES Standard (Pin-2 Hot)
Connectors Balanced XLR-F In; 1/4", RCA, and 3.5 mm TRS Unbalanced Outputs
Construction 14-Gauge Steel Chassis
Finish Baked Enamel
Power Passive, No Power Required
Dimensions 83.8 x 127 x 50.8 mm
Weight 703 g

In The Box

  • Radial Engineering Pro-ISO +4/-10 dB Stereo Line Isolator


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  • Product: Radial Engineering Pro-ISO +4/-10 dB Stereo Line Isolator
  • Manufacturer: Radial
  • Model: ProISO
  • RM Product #: 96258
  • Warranty: 5 year manufacturer warranty

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