Originally Posted by tuxedocivic
Yes, compliance is Cms, usually is units of mm/N. That's millimeters per Newton. A newton is a measure of force. Moving mass is Mms, usually in g, grams. That's just the weight if the cone and such. Basically, if these are good, the subwoofer will react to even small inputs that are common in music. Like the lowest register of a piano playing very lightly.
But what's a high Cms: .12mm/N, .25mm/N .5mm/N?
The SBacoustics has a .71mm/N and a feather light 99g Mms.
The LMS5400 has a .12mm/N Cms and a massive 501g Mms, yet it gets a unanimous "OMFG it's teh awesomE" review from listeners at both music and movies. I'm not disagreeing with you (I actually agree with you*), but there are other factors involved than just Cms, Mms, and Fs.
*My TD15H's were quite musical and I thought they sounded fantastic.
Cms .45mm/N, Mms 129g, Fs 21hz.