Its not a new fad.....
Its very dynamic...again just different and understandably not a 1 size (should) fits all.
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Well only as of 2 yrs ago, was I aware of this double stack thing at my tech's house, has a double room with 14 ft ceilings for his stacked AR3's, it worked, but again, I longggg ago left behind that paper cone midwoofer sound.
It is dynamic, but with baggage.
I only want,~~ DEMAND~~~ pure 100% neutrality.
My Seas Thors were pure neutral, but with a 87db (IF THAT!!) sens, made them sadly ineffective = inefficient vs a WBer's 95db. (which is too high for my needs)
Again both tech geeks love their vintage stacks.
Neither would have zero interest in WBers.
each his own I guess.