MLA-XLR - 1 Input / 1 Output MIDI Line Amplifier MIDI Computer Interfaces The MLA-XLR from JL Cooper is designed to act as a single channel bi-directional long distance amplifier or driver for MIDI signals. While the normal MIDI protocol specifies a maximum cable distance of about 50 feet this is sometimes not sufficient for some installations. The MLA-XLR takes a MIDI input and converts it to a balanced differential signal using the RS-422 specification. At the other end another MLA-XLR detects the signal using a sensitive receiver that has a high degree of noise immunity. Connecting the two MLA-XLRs are two standard shielded twisted pair microphone cables. The combination of a low impedance differential driver coupled with a sensitive differential receiver signal lends itself to long distance error free installations and making it possible to send a MIDI signal through 1000 feet of cable or more. The MLA-XLR is compatible with the JLCooper MLA-1 and MLA10