Transformer impedance matching design enables high quality audio distribution. Isolate left and right channel ground returns make the SA-6 compatible with all types of amplifiers. Suitable for 4, 6and ohms speaker system. Total power output of 180 watts RMS and 360 watts music power for 6 pairs of speakers. A/B source switch allows selection between 2 sources. Push-to-connect Terminal handles up to 18 gauge speaker wire.