CI-2RR Two channel ground isolator

The Iso•Max CI-2RR is a passive two channel audio ground isolator designed to eliminate hum and buzz caused by ground loops in the most demanding audio systems.

  • Eliminates hum and buzz caused by ground loops
  • Extended frequency response from 10 Hz to 40 kHz
  • Less than 2° phase deviation at 20 Hz
  • Plug and play easy to use – no power required

The unbalanced stereo design begins with gold RCA connectors to ensure optimal signal transfer. These are housed in a rugged steel enclosure that is fitted with screw-down flanges for easy installation in racks, under shelves or attached to cabinetry. The magic inside comes from two high performance Jensen Transformers that deliver pristine audio from 10 Hz to 40 kHz with less than 1 dB of deviation, less than 0.05% harmonic distortion and less than 2° phase shift at all frequencies. The transformer is shielded in a MuMETAL® can to protect against external magnetic fields and prevent “spectral contamination” due to ultrasonic and RF interference. This assures your music will be faithfully delivered without distortion, coloration or artifact no matter what the program material or signal level.

These features makes the CI-2RR the perfect choice for 2 channel audiophile systems, home theater, Hi-Z recording sound cards, car audio and any other unbalanced audio signal.


CI-2RR in a HI-FI system

Connect the CI-2RR in between your preamp and power amp to eliminate noise without affecting the signal quality. The CI-2RR’s exceptional frequency response, phase accuracy and signal handling makes it perfect for high-end 2 channel systems.

CI-2RR in a home theater

Combining video and audio together in home theater setups can often lead to noise. The Iso-Max CI-2RR solves the problem by isolating the video playback system from the multi-channel audio system, eliminating the hum and buzz caused by ground loops and DC offsets.

CI-2RR in a your car

Car audio enthusiasts know the challenges of ground hum polluting their audio. Turning up the volume only amplifies the problem. Isolating the radio/receiver from the power amp eliminates buzz caused by ground loops. The CI-2RR does it perfectly without affecting the performance.


All levels are input unless noted, +4 dBu = 1.23 V RMS

Input impedance, Zi 1 kHz, +4 dBu, test circuit 1 47.0 kΩ 48.6 kΩ 50.0 kΩ
Insertion loss 1 kHz, +4 dBu, test circuit 1   0.82 dB 1.0 dB
Magnitude response, ref 1 kHz 20 Hz, +4 dBu, test circuit 1 -0.15 dB -0.03 dB ±0.0 dB
Magnitude response, ref 1 kHz 20 kHz, +4 dBu, test circuit 1 -1.0dB -0.70 dB ±0.0 dB
Deviation from linear phase (DLP) 20 Hz to 20 kHz, +4 dBu, test circuit 1   +1.4/-0° ±2.0°
Distortion (THD) 1 kHz, +4 dBu, test circuit 1   <0.001%  
Distortion (THD) 20 Hz, +4 dBu, test circuit 1   0.04% 0.10%
Maximum 20 Hz input level 1% THD, test circuit 1 +17 dBu +19 dBu  
Common – mode rejection ratio (CMRR) 60 Hz, test circuit 2   95 dB  
Common – mode rejection ratio (CMRR) 3 kHz, test circuit 2   85 dB  
Output impedance, Zo 1 kHz, test circuit 1   4.65 kΩ  
Allowable source impedance (output impedance of device driving the ISO-MAX input) 0 600 Ω 2 kΩ
Allowable load impedance (input impedance of device loading the ISO-MAX output) 10 kΩ 47 kΩ ∞ 
Allowable load capacitance (cable & input capacitance loading the ISO-MAX output) 0 50 pF 100 pF
Optimal cable length input   3 m (10’) 8 m (25’)
Optimal cable length output   1 m (3’) 3 m (10’)
Temperature range operation or storage 0°C   70°C
Input to Output Voltage Difference* any input to any output shield or any shield to case, 60 Hz     24 V RMS 34 V peak


Phase Distortion (DLP)
Frequency Response
THD vs Level at Low Frequencies
THD vs Frequency at Various Levels

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