Question on fi ssd

[DaRevrin 0]

About how much excursion does a fi ssd 10 have? Im thinking about getting 2 and really need to know so ill be sure if their going to hit the back of my seat or not. Thanks

[buickid 0]

ficaraudio.com says 21mm of Xmax.

[ronrico418 0]

can subs face up? or back? What kind of vehicle?