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Radial Engineering SB-6 Isolator

Compact stereo isolator for bal/unbalanced signals, passive

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The Radial StageBug® SB-6 is a high performance 2-channel passive audio isolator designed to accommodate both balanced and unbalanced signals and work effectively at eliminating noise when used with instruments, consumer electronics as well as professional line-level devices.

The design begins with ¼" TRS inputs and outputs to accommodate both TRS and mono type connectors. The unique circuit retains the balanced signals or automatically converts them from hi-Z to lo-Z (¼" mono to TRS) or lo-Z to hi-Z (1/4"TRS to mono) depending on the connector in use. You simply connect and the SB-6 does the work for you! Inside are two ultra-linear Eclipse transformers that sound great as they deliver ruler flat performance from 20Hz to 20kHz. This is augmented with a -10dB input pad to handle extra loud source devices and a polarity reverse on output B for phase aligning stereo signals. As the circuit is passive, no power is required – simply plug in and play. As with all Radial products, the SB-6 is made in Canada and features 16 gauge steel construction for use on the road and finished in a durable powder coat finish.

These features combine to make the SB-6 Isolator a wonderful solution to help rid system noise in two channel audio systems, stereo guitar racks and pedalboards.


Automatically configures for hi-Z or lo-Z signal chains

Eliminates hum and buzz caused by ground loops

Exceptionally linear from 20Hz to 20kHz

Isolator for balanced and unbalanced signals


Audio Circuit TypePassive transformers
Frequency Response20 Hz to 20 kHz +/-1 db
Dynamic Range>140 dB
Maximum Input>+25 dBu
Gain-2 dB
Total Harmonic Distortion
Phase Deviation>5° @ 30 Hz
Input ImpedanceVaries with load 47 KΩ
Output Impedance600 Ω
FeaturesTransformer: Eclipse customInput Pad: -15 dB Polarity: 180&deg reverseGround Lift: Disconnects TRS sleeve at output
Input Connector1/4" (6.3 mm) TRS phone
Output Connector1/4" (6.3 mm) TRS phone
Construction14 gauge steel chassis & outer shell
PowerPassive, no power required
Operating ConditionsFor use in dry locations only between 41 to 104&degF (5 to 40&deg)
Dimensions (L x W x D)4.50 x 1.85 x 1.35" (114 x 47 x 34 mm)
Weight0.9 lb (408 g)
Package Weight1.0 lb
Box Dimensions (LxWxH)7.3 x 4.7 x 2.1"