The MacroMIX gives you 4 channels with level controls, a variety of input types, and active mixing circuitry. Use this mini mixer from ART for all kinds of situations in the studio, such as solving level mismatches, sub-mixing of instruments, cable testing, preamping mics or turntables, etc.4 input channels: dual RCA inputs on channels 1 and 2, 1/4" or dual RCA inputs on channel 3, and 1/4" unbalanced input on channel 4 Level control on each channel L/R RCA outputs 1/4" line out/stereo headphone output Active preamplification and mixing circuitry Input Impedance: 10K ohms unbalanced