I'm guessing you're talking about 120vac for powered monitors running next to +4 balanced lines to feed those monitors? 200 ft. is a bit long for that kind of run... you could quite possibly get some 120Hz [and 60, and 180, and 240Hz] hum induced in the audio lines.
Conduit is cheap enough... have the electrician run power to an outlet located near the monitors and keep the AC away from your audio lines if you have the option.
If you're talking about running the output of an amplifier [speaker level lines] -- then locate the amplifiers MUCH closer to the speakers and run +4 audio to the amps. I've always found that the shortest run from amplifier to speakers is best.
I hope this is of some assistance.
Peace