The quadro-transducer shielding system (QSS) technology was a type of modification to the deflector shields, first successfully used on the Federation Starfleet's Royal Sovereign-class starships in the mid-24th century, representing an advance over the quadri-transducer shield used in the Excelsior-class and its predecessors. (FASA RPG module: Star Trek: The Next Generation Officer's Manual)

Presumably this modification makes use of four transducers, and if it was as successful as the text described, would probably be used on other later 24th century starship classes created by Starfleet.

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