Do you have 3 power amplifiers and 3 sets of speakers that need to be connected to each other? Do you need 3 amplifiers and 3 sets of speakers to get stuck? A powerful amplifier and audio switcher can solve these problems. Features: 3 power amplifiers push-button select switch input, 3 sets of stereo speakers push-button select switch output (3 sets of speakers can be opened or closed independently). 3 sets of stereo speakers can sound at the same time, you can also turn off one group of speakers or more groups of speakers individually, manually select the push button switch. The maximum power of each channel is 300W. Signal input provides vacuum tube power amplifier signal no-load protection function. Manual selection of input and output switching, straight plug straight use, switching signal stability, between channels will not produce another dry close or noise. Compact design of solid metal shell, easy installation, the product does not need external power. Simple installation: input and output plug and play easy installation, you can enjoy different audio experience. Specifications: Material: Metal Input: 3 sets of inputs (banana plug) Output: 3 sets of output (banana plug) Power: up to 300W Channel Power: Each channel supports up to 300W of power Frequency Response: 10Hz-50KHz Compatible With: All types of power amplifiers and speakers Item Size: 240 * 105 * 55mm / 9.45 * 4.13 * 2.17in Item Weight: 960g / 2.12lb Package Weight: 1130g / 2.49lb Package Size: 26 * 18.5 * 6.5cm / 10.23 * 7.28 * 2.56in Input/output accepts heavy-duty speaker wire or speaker pin wire through the terminal port. Connect the power amplifier to amplifier 01-02-03. Connect the loudspeaker to position A-B-C respectively. Turn on your power amplifier stereo device and the product requires no external power supply. Package List: 1 * Distributor 1 * User Manual (English)