LINEPAUDIO Professional 6 Pair Single Source Speaker Selector Bidirectional Connection Stereo black.This is a bidirectional speaker switcher that allows users to connect 6 pairs of speakers to a single stereo receiver or amplifier or to connect 6 amplifiers/receivers to a single speaker pair, making it convenient and flexible to use. Features: 6 pair single source design speaker selector supports bidirectional connection, which allows 6 pairs of speakers to be connected to an amplifier or vice