Impedance Matching

  • Power Handling: 100 watts RMS per channel
  • Frequency Response: 20 Hz – 22,000 Hz (+0dB, -0dB)
  • Wire Size Acceptance: Up to 14 gauge wire
  • Dimensions: 1 7/8″ x 11 1/2″ x 7″


Maximum Number of Speaker Connections: 4 pairs (4 ohm minimum)


Minimum Amplifier Impedance with All Speakers Selected:

  • All 8 ohm speakers connected and engaged: 5.3 ohms
  • All 4 ohm speakers connected and engaged: 4.6 ohms

The SS4R is a resistor based, automatic impedance-matched speaker selector used for connecting 4 pairs of speakers while maintaining a safe impedance load for your receiver. Each pair of speakers can be turned on or off independently in any combination without concern for amplifier loading.


  • Connect and safely control multiple speaker pairs
  • Automatic impedance matching protection circuitry engages without the need for user involvement
  • Individual room On/Off pushbuttons
  • Heavy-duty screw-type connectors are removable and accept up to 14 gauge wire
  • Isolated left/right circuit grounds provide safe connections for amplifiers with floating grounds or bridged configurations
  • High-quality construction throughout provides excellent reliability, accurate noise-free switching and years of trouble free operation
  • Rubber feet prevent scratching and keep selector in place during operation
  • Removable speaker connectors
  • Easier installation ¬†and firmer connections
  • Heat-sink-covered resistors ; higher power-handling
  • Venting above and below resistors
  • Smarter design means higher power handling and longer life