I hit the wake of a preceding 320 about a week ago on the way to somewhere in Europe, (they all blend into one) ..... was just one very quick, but fairly large bump.... got on the PA, told the pax exactly what it was, exactly how far ahead the aircraft was, and that it was the aerial equivalent of running over one of those infernal speed-bumps so beloved of UK county-councils at 30 miles an hour.
Everyone happy. Passengers are adults, they are in an environment they do not understand, one in which they would LIKE to have control, but don't. Treat them like adults, give them the facts, and they are happy... and that applies to ALL aspect of flight, delays, tech. problems whatever. Honesty really is the best policy.