This notion that Definitions are somehow not suitable for classical music and are instead a "rock and blues" speaker is unfounded. The speaker is remarkably neutral in tonal balance, can lay out a highly-scalable soundstage macro to micro, has sensational dynamic range with real-world amplifiers, and is among the best speakers at any price for maintaining clarity of the many simultaneous sound events in a full symphonic crescendo -- owing of course to superior resolution in part due to lack of crossovers.
I lived in Boston for a decade and had a share of season tickets for the BSO in Symphony Hall. That hall is its own instrument and distinctive in its acoustic signature. The sound of the hall is more readily apparent through Zu Definitions on recordings made there, than with any other home hifi speaker I can recall. Chamber music is realistically scaled and transient and dynamic delicacy is preserved. Opera is fully emotive. Yet the explosive power of expression of a full orchestra is vividly projected into your listening space.
These qualities simply support high fidelity regardless of music genre. The same qualities in the Zu Definition that render it effective at communicating the energy and emotion of rock or blues, also work to same advantage on classical music, but with this speaker nothing is given up in terms of downscaling and resolution on smaller works.
Phil