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Some mixers are AC coupled. Some aren't. The best way to make sure you're not passing DC to your amp, though, is to make sure of this in the source itself. In this case, you're looking for output modules that have transformer isolation or offer balanced outputs (which generally implies transformer isolation). Happy Nerding offers two that are worth consideration: the Isolator is a basic, two-channel transformer-isolated output level attenuator, and their OUT not only offers this, but adds a headphone amp plus a second parallel stereo input which can be used as an effects return, plus you get stereo LED level metering. Also, Bastl's Ciao! does this w/o metering, but has input clip indicators for both stereo in pairs and a potential second stereo (3.5mm TRS) line out and a few headphone monitoring tricks that can allow you to have one stereo pair going to the outputs while the other can be monitored on headphones, allowing you to work on an entire second patch at the same time that the other is playing. Any of these would be very useful.