10-25 Hz, is it necessary for HT or Music?

BP's sound effortless where as I feel like I can hear direct radiators move. Its definitly a different sound to me. I'm a Boom Bap guy so I mainly listen to alot of instrumentals. Search "type beat" in youtube or youtube music to get where I come from.

Anyways, if a driver moves, it distorts. A driver moves less in a BP than a sealed or BR per a given voltage.

I think the folds in BP's mask driver's mechanical noises.
 
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