Your theater room is effectively 70' by 100'? Your home must be palatial.
My modest theater area is 310 square feet (12'-10" by 24'-2"), a shade under 2600 cubic feet, and I'll be using two of these subs over a concrete floor. If your room is truly 7000 square feet, two VTF-3 Mk5 subs won't be nearly enough.
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