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SS-4.2 4 Pair Single Source Impedance Matching Speaker Selector The SS-4.2 allows you to switch up to four speaker pairs connected to a stereo amplifier. Offering high-quality audio performance, it also provides overload protection and long-term reliability. The SS-4.2 offers two operating configurations: Impedance Matching and Bypass. Impedance-matching mode provides automatic overload protection for use even with high-power amplifiers. This mode allows multiple pairs of speakers to be safely connected to an amplifier using the built-in automatic impedance-matching circuitry. Bypass mode is used for direct speaker switching with remote impedance-matching volume controls. This allows local control in each room as well as higher efficiency; however, in this mode the impedance matching and overload protection are not engaged. Designed for use with 8-ohm loudspeakers, 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. Features -Designed for high audio quality and long-term reliability -"Provides impedance matching and automatic overload protection compatible with high-power amplifiers -Bypass mode allows direct speaker switching when using remote impedance-matching volume controls -"Ten-year parts and labor warranty Specifications Shipping Dimensions: 11.8" (W) x 2.5" (H) x 10.3" (D), (29.8 x 6.4 x 26.0 cm) Shipping Weight: 2.5 lbs (1.1 kg) Connector(s): Spring terminals Frequency Response: 20 Hz - 20 kHz +/- 0 dB Max Wire Size: 12 AWG (2.4 mm) Power Handling: 100 watts per channel peak, 100 watts per channel RMS