SUB-2RR Two channel sub-woofer isolator

The Iso•Max SUB-2RR is a two channel low-frequency isolator designed especially for use with sub-woofers that are designed with stereo inputs to eliminate hum and buzz caused by ground loops.

  • Eliminates hum and buzz caused by ground loops
  • Extended low frequency response down to 1 Hz
  • Less than 0.01% distortion at 20 Hz
  • Plug and play easy to use, no power required

Inside, a specially designed Jensen audio transformer with extended sub-sonic response delivers powerful and articulated bass for maximum impact. Even when being subjected to extremes, the SUB-2RR is able to gracefully handle low frequencies down to 20 Hz with less than 0.01% distortion and less than 1 dB of phase shift. And with better than 100 dB of common mode noise rejection, it solves the most difficult installation problems so that you can enjoy the full performance of your audio system without noise.

Housed in a heavy duty steel enclosure, the SUB-2RR is equipped with a ‘screw down flange’ for easy mounting inside an equipment rack, under a shelf or directly on the sub woofer. Gold plated RCA connectors ensure optimal signal transfer and will not corrode over time. The passive design does not require any power. You merely plug in and it goes to work without artifact or signal degradation. These combined features make the Iso-Max SUB-2RR ideal for home theater, studio and car audio installations.


SUB-2RR in a HI-FI system

Connect the SUB-2RR right before your sub-woofer to eliminate hum and buzz problems in your hi-fi, audiophile or home theatre system.

SUB-2RR in your car

The SUB-2RR isolates your car audio receiver system from your sub amp to eliminate nasty sounding ground loops. Locate next to the sub woofer amp for best performance.


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

Input impedance, Zi 100 Hz, -10 dBV, test circuit 1 39.0 kΩ 39.4 kΩ 39.8 kΩ
Insertion loss 100 Hz, -10 dBV, test circuit 1 -0.30 dB 0.00 dB .30 dB
Magnitude response, ref 100 Hz 2 Hz, -10 dBV, test circuit 1 -0.25 dB -0.11 dB -0.00 dB
Magnitude response, ref 100 Hz 2 kHz, -10 dBV, test circuit 1 -0.8 dB -0.65 dB -0.50 dB
Deviation from linear phase (DLP) 10 Hz to 2 kHz, -10 dBV, test circuit 1   +0.7/-0° ±2.0°
Distortion (THD) 100 Hz, -10 dBV, test circuit 1   <0.001%  
Distortion (THD) 20 Hz, -10 dBV, test circuit 1   0.01% 0.05%
Maximum 20 Hz input level 1% THD, test circuit 1 +16 dBV +18 dBV  
Common – mode rejection ratio (CMRR) 60 Hz, test circuit 2   105 dB  
Common – mode rejection ratio (CMRR) 3 kHz, test circuit 2 50dB 65 dB  
Output impedance, Zo 100 Hz, test circuit 1   5.00 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) 20 kΩ 47 kΩ  
Allowable load capacitance (cable & input capacitance loading the ISO-MAX output) 0 50 pF 1000 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* input to output shield or either shield to chassis, 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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