graz_lag
Major Contributor
True, but you can do it with a lot less displacement than that. Requires very large woofers though. I'm not sure why you'd want to do it in the first place, anyway, especially in a domestic context where sub-audible frequencies are likely to cause audible rattling. Or any context for that matter...
Hmm ... My REL sub-bass system (10" drive) vibrates much less (or practically doesn't @svart-hvitt) than my Klipsch subwoofer with 12" drive ...