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Output Power: Add Pre-5532 output foot powered 25V, 6Ω impedance output 2x50W Power: 2.1 interface 8-25V DC power supply Chip: TDA7492, CSR8635, Bluetooth V4.0 The sound quality is very good, big power. Output Impedance: 8 Ω¸(Best), 4/6/8/16Ω¸ impedance can drive speakers DIP switches can be adjusted directly after the amp gain more respect and better promote greater damping horn