Item #1505774 Model #R800-0160-00

Radial Engineering StageBug SB-6 Passive Stereo Line Isolator Standard


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Two-channel passive audio isolator that accommodates balanced or unbalanced signals.

The SB-6 helps remove noise from two channel audio systems, stereo guitar racks, and pedalboards. Two on-board isolation transformers provide a flat frequency response from 20Hz to 20kHz, while removing hum and buzz from ground loops. Dual ground lift switches help further reduce noise, and a -15dB pad allows you to handle high volume outputs without distortion.

When using the SB-6 before a set of powered speakers or guitar amplifiers, a polarity reverse switch corrects frequency cancellation and ensures both speakers play back in phase with one another. The SB-6 is completely passive with no need for power, so it's easy to insert into any system to remove noise quickly.
  • Audio circuit type: Passive Transformers
  • Transformer: Eclipse Custom
  • Frequency response: 20Hz-20KHz +/-1db
  • Dynamic range: >140db
  • Gain: -2dB
  • Total harmonic distortion: <0.0008% @ 1kHz
  • Phase Deviation: >5° @ 30Hz
  • Input Impedance: Varies with Load/47K
  • Output Impedance: 600Ω
  • Maximum Input: >+25dBu
  • Features
    • Input pad, 180° polarity reverse, Ground lift
    • Input Connectors: 1/4" TRS
    • Output Connectors: 1/4" TRS
    • Construction: 14 gauge steel chassis & outer shell
    • Size (L x W x D): 3.92" x 2.54" x 1.7" (100mm x 65mm x 43mm)
    • Weight: 0.9 lbs (408 grams)
    • Shipping size (L x W x D): 8" x 5" x 3" (203mm x 127mm x 76mm)
    • Shipping weight: 1.0 lb. (453 grams)
    • Power: Passive, no power required
    • Conditions: For use in dry locations only between 5°C and 40°C


    • Isolator for balanced and unbalanced signals
    • Eliminates hum and buzz caused by ground loops
    • Exceptionally linear from 20Hz to 20kHz
    • Automatically configures for hi-Z or lo-Z signal chains

    WARNING: This product can expose you to chemicals including Titanium dioxide (airborne, unbound particles of respirable size), which is known to the State of California to cause cancer, and Lead, which is known to cause birth defects or other reproductive harm. For more information go to