Product Search Title Name 2 In and 2 Out Switcher Volume Controller, RCA signal switches to XLR balanced signal and no need for power supply. It provides RCA and XLR interfaces, independent L/R channel volume adjustment, which is suitable for devices with volume adjustment need Product DetailsA977 passive preamp active speaker volume dual-channel controller is small insize and suitable for active speakers or preamp/post-amp,it supports full-balance or input and output of single-ended signal.The product has functions of independent L/R channel volume adjustment, 2 signals input and 2 signals output.It provides balanced XLR and unbalanced RCA connectors which are automatically converted to each other,with a selector switch facilitates the signal switch of input/output.Small size, big intelligence.The product is of small size, but has well-function connecters.It is suitable for decoders and speakers without volume adjustment.the product has the design of balanced input/output and RCA input/output architecture, with switching function.The operation of the product will not cause loss of signal source. Generally,the audio signal released from the decoder is the original sound source signal. Great dynamics will not cause loss of sound quality,retaining the complete original signal source. Product featuresInput/output impedance: 10K - 50K2 in 2 out switchover, unbalanced RCA connector and balancedXRL connector for input/outputInput: unbalanced RCA connector / balanced XLR connector (convert selection)Output: unbalanced RCA connector / balanced XLR connector (convert selection)Product net weight: 0.32 kgProduct package weight: 0.42 kgProduct dimensions: length 145mm X width 65mm X height 43mmPackaging dimensions: length 200mm X width 180mm X height 55mm Packing list1 X A977 2 In and 2 Out Switcher Full-balance Passive Preamp Active Speaker Double Sound Source Volume Controller