I would recommend making sure your "audio/video" breakers are definitely on the same pole. In most standard US panels, the poles alternate on each sequential breaker position. So you would have to "skip" a breaker location in between each audio/video breaker so that it's placed on the same leg/pole.
A normal US 220V breaker takes two breaker slots/connections and uses both 110V poles in a push/pull configuration to produce the 220V.
A normal US 220V breaker takes two breaker slots/connections and uses both 110V poles in a push/pull configuration to produce the 220V.