BBE 882i Sonic Maximizer Rackmount Unit 1U with Pair XLR Cables 110V~50/60Hz NEW. Input Impedance: 14.7K Ohms, balanced 1/4″ stereo phone jack or XLR jack. Pin #2 is the hot or “+” signal. Output Impedance: 600 Ohms, balanced 1/4″ stereo phone jack or XLR jack.