We construct families of irreducible representations for a class of quantum groups U q ( f m (K , H ). First, we realize these quantum groups as hyperbolic algebras. Such a realization yields natural families of irreducible weight representations for U q ( f m (K , H )). Second, we study the relationship between U q ( f m (K , H )) and U q ( f m (K )). As a result, any finite-dimensional weight representation of U q ( f m (K , H )) is proved to be completely reducible. Finally, we study the Whittaker model for the center of U q ( f m (K , H )), and a classification of all irreducible Whittaker representations of U q ( f m (K , H )) is obtained.2000 Mathematics subject classification: 17B10, 17B35, 17B37.