Rolls MX51 Mini 4 Channel Mixer
The MX51 is a small 4 channel mixer with individual volume controls, headphone and line outs. It has 2 1/4" inputs and 3 sets of stereo RCA inputs that are mixed to MONO. It has enough gain and output level for a power amp, has 2 RCA and one 1/4" output, and is powered by an included A/C adapter.   Specifications:    Input Impedance: 10K Ohms unbal. each jack  CH 1 Gain: 32 dB 1/4" jack (max gain)  CH 2 Gain: 26dB 1/4" RCA  CH 3 and 4 Gain: 26dB each RCA  Output: 1/4" stereo and RCA  S/N Ratio: 90 dB  THD: .008%  IMD(SMPTE): .008%  Power: 12VDC adapter  Weight: 1 lb. (.45Kg)  Size: 3" x 5" x 1.25" (8 x 13x x 3.2)