fwiw, using the xa60.5s on my WP6s in a room 15*11*8 (ie small), i am seldom able to get the meters to move (ie leaving class A), but it happens sometimes.
easy to play music 90db for extended sessions if distortion is low enough.
I have just switched from Pass XA100.5's to a Bat VK-600SE with my Sophia2's as the Pass\Wison combo didn't satisfy in terms of bass control (on the sloppy side with Pass).
I'd be leery of using a 30.5 unless I listened very quietly.
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