The MX51S mini mix 2 is small four-channel mixer with individual volume controls, and a headphone/ line output. The unit has one XLR input along with an 1/8” input and 3 sets of stereo RCA inputs. It has enough gain and output level to connect to a power amplifier, with either RCA or 1/8” jacks. The MX51S is powered by an included rolls PS27 12 VDC adapter.