JBL Studio 220 2-way bookshelf loudspeakers. As part of the groundbreaking 10-piece JBL Studio 2 loudspeaker series, the Studio 220 propels you into a world where legacy sound-craft and advanced technology go hand-in-hand in shaping a listening experience like never before. The Studio 220's 4" PolyPlas midrange driver is designed to bring you pitch-perfect vocal clarity and tight, accurate bass. Add to that the built-in High Definition Imaging (HDI) waveguide design and the 1" CMMD Lite high-frequency driver, and you've got a loudspeaker that takes its cues from JBL's own legendary M2 Master Reference Monitor. Combine this with the sleek, urbane design of the loudspeaker itself both inside and outÂ and you're dealing with a rare breed of sonic horsepower and brainpower ready to define its era.