We have two 50 metre audio-multicore cables. They don't have a great many channels in them, as commonly used for mixing desk multicores, but just a few audio lines for special uses. Essentially, they're a long stereo microphone cable, with extras. There's a hard-wired break-out box at each end of the cable, with:
Two balanced lines with 3-pin XLR connectors at each end (female at the remote end, male at the mixer end). The first line has its shield connected to the overall cable shield, at the mixer end of the cable.
Two unbalanced lines with ¼″ TS sockets at each end. The remote ends are terminated with 300Ω resistors, when the sockets are empty, to reduce noise pickup. The mixer ends are connected to the cable shield, when the sockets are empty, to reduce noise pickup.
Two unbalanced lines with a stereo ¼″ TRS sockets at each end. Mainly intended as a headphone line, but could be used for other stereo audio purposes. The remote end is terminated with 75Ω resistors, when the socket is empty, to reduce noise pickup. The mixer end is connected to the cable shield, when the socket is empty, to reduce noise pickup.
Two unbalanced lines with a 4-pin XLR connector at each end (female at the remote end, male at the mixer end). Intended to be used for connecting an intercom station, but can be repurposed.
Two insulated wires with a 3.5 mm TS socket at each end. Could be used for a tally or cue light, signal switches, cough switches, or an earpiece. At the mixer end, the tip of the TS jack is connected to the cable shield when the socket is empty, to reduce noise pickup.
The cable is double-screened, each balanced and unbalanced line has their own screen, and there's a foil wrap around all the cores. I've found it to reject hum pickup from adjacent mains wiring more effectively than various other ordinary balanced microphone cables.
Useful as a snake to a boom mike operator, with two microphone lines, fold back lines, headphone lines, and intercom lines.
Useful as a single cable to a stereo microphone, with spare connectors to aid in setting up (headphones to monitor the mixer output, intercom lines).
Useful as a snake to a studio desk, with microphone and earpiece lines.
Users of these cables must learn, or already know, how to properly handle cables. For storage they must be over-and-undered, or figure-eighted. They must be handled properly at all times, not just when returned to us. We will not accept mangled cables, and, if damaged, you will be charged to replace the entire cable.