[Darryl Ramm]

This is a new or used C|24? If used do you know if the monitor stage was working OK? How long do you have to work out stuff before you can't return it?

There is nothing complex about the monitor section. And it is entirely separate from the rest of the C24 or Pro Tools. You need to troubleshoot what is going in. Swap L/R inputs at different points in the signal flow. Check the connection on the lower volume side is correctly wired with balanced wiring etc. to work out if it is an issue in Pro Tools, your interface output, the cable, C24, monitor wiring, monitors... (although it sounds like an issue well before the monitor cabling).

You don't really need Pro Tools to debug any of this. But Pro Tools offers a convenient sine wave test signal from the signal generator plugin that you can also check with an AC multimeter.

Use a multimeter/continuity tester to confirm the cable you are using is wired correctly. What exact (brand/part number) cable are you using connecting *exactly* what to where? All the wiring info you need is in the C|24 documentation and hopefully the doc for whatever interface you are using.

It may be easier to make a quick test cable or just probe/clip leads onto a bare DB25 connector plugged into the input connector onto the back of the C|24.

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