The Russound SS-4.2 four pairs of speakers to be turned on and off through individual switches on the front panel. Multiple pairs may be engaged simultaneously if desired. When multiple pairs are engaged, impedance matching protection must be employed to protect the amplifier from damage. The SS-4.2 have this impedance matching protection built in, when selected by the Impedance switch on the rear panel. They also have built-in circuit overload protection that disengages the amplifier signal if it exceeds the limits of the selector. After being tripped, the amplifier must be shut off before the SS-4.2 will automatically reset itself. If this occurs, check all system components for proper connections and use.
The Russound SS-4.2 speaker switch can be used in one of two mode settings:
Impedance matching mode This method of impedance matching uses the SS-4.2 internal high-powered resistors to eliminate the need for external impedance matching devices.
Bypass mode (Impedance switch set to “BYPASS”) This method requires the use of external impedance matching devices such as the Russound LPTx or ALTx volume controls, as the selector’s overload protection and impedance matching will be bypassed. In this mode, using external impedance matching volume controls will allow higher system efficiency and a configurable level of impedance matching for specific amplifier needs beyond the scope of the selector alone.
NB: All speakers should be a minimum of 8 ohms,the SS-4.2 also provides safe connection to bridged amplifiers and even works in applications where there is a floating ground. It has spring-loaded speaker terminals for quick connection and can accommodate speaker wire up to 12 gauge.