JBL Studio 230 2-way bookshelf loudspeakers. As part of the groundbreaking 10-piece JBL Studio 2 loudspeaker series, the Studio 230 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 230's 6.5" PolyPlas midrange driver is designed to bring you pitch-perfect vocal clarity and tight bass that's as accurate as it is cinematic. Add to that a built-in High Definition Imaging (HDI) waveguide design and a 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 itselfÂ both inside and outÂ and you're dealing with a rare breed of sonic horsepower and brainpower ready to define its era.