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The compact AT-2 speaker delivers a level of deep bass not previously thought possible from a bookshelf-sized speaker. The AT-2's patented H-PAS bass system (Hybrid Pressure Acceleration System) is the reason. It combines elements of several speaker technologies-acoustic suspension, bass reflex, inverse horn, and transmission line-in a unique configuration to deliver powerful low-frequency response that breaks the Iron Law of loudspeaker acoustics: the notion that you couldn't have deep bass extension, good system sensitivity and reasonable enclosure size all in one design. H-PAS changes all that.