For a 2-channel stereo system, which consists of a pair of bookshelf speakers and a powered subwoofer, what difference does it make if the bookshelf speakers go down to 70Hz vs. 30Hz (or anything else in between)?
I'm not sure too many bookshelf speakers can go down to 30Hz. If they can, and you are just using them for mostly 2-channel stereo music listening, I think it would be better to skip the subwoofer altogether.
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