The Rolls MX42 is a miniature audio mixer with 4 stereo RCA inputs and stereo RCA output. The mixer is capable of mixing signals from CD players, instruments, portable recording devices, video playback devices and more. Passive circuitry allow the MX42 to operate without the need for battery or external power. Level control dials for each channel are located on the front.
| Input Connections | 4 - L/R Stereo RCA Phono |
| Output Connectors | Stereo L/R RCA Phono |
| Max Input/Output Gain | -12dB MAX |
| Signal-to-Noise Ratio | not specified by manufacturer |
| Phantom Power | no microphone inputs - not applicable |
| AC Power Requirements | Passive - no external power required |
| Dimensions | 3 x 2 x 1.43" (WxHxD) |
| Weight | 1 lb |