... rack mount3. Specificationsa) AudioInput/output impedance: 600ΩequilibriumInput/output interface: XLRMax. input/output level: +15 dBuFrequency Response: 20Hz ... mode, single fiber, FC/PC fiber connector, XLR audio interface(RCA optional), standard 20km (0-120km optional), stand- ... mode, single fiber, FC/PC fiber connector, XLR audio interface(RCA optional), standard 20km (0-120km optional), stand- ...