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 LR channel volume adjustment, which is suitable for devices with volume adjustment need Product function introduction A977 passive preamp active speaker volume dual-channel controller is small in size and suitable for active speakers or preamppost-amp, it supports full-balance or input and output of single-ended signal. The product has functions of independent LR 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 inputoutput. 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 inputoutput and RCA inputoutput 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 parameters Inputoutput impedance: 10KΩ - 50KΩ 2 in 2 out switchover, unbalanced RCA connector and balanced XRL connector for inputoutput Input: unbalanced RCA connector balanced XLR connector (convert selection) Output: unbalanced RCA connector balanced XLR connector (convert selection) Product net weight: 0.32 kg Product package weight: 0.42 kg Product dimensions: length 145mm X width 65mm X height 43mm Packaging dimensions: length 200mm X width 180mm X height 55mm Kit list 1 X A977 2 In and 3 Out Switcher Full-balance Passive Preamp Active Speaker Double Sound Source Volume Controller