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A library sent me the following guidelines for their delivery process: "-6DB Unmastered."

I'm wondering what the protocol is for achieving the proper levels (turn down the master? Make sure the loudest peak is -6DB?). They asked me to turn off all mastering plugins, so I assume using a limiter would be out.

Thanks in advance.

I assume you're doing one of two things :

A - Mixing in the DAW and then bouncing down a file to work on with your favourite mastering software, in which case just send them the unmastered bounce

B - Mixing & Mastering within the same DAW session, in which case just bypass your normal mastering plugins ( mine is Ozone pls a few others )

I would say leave your brickwall limiter as the final plugin but wthout any gain reduction just in case there are any stray peaks ( intersample peaks won't always show on a meter )

Mark