The box my Ultra-X12 came in has a foot print of 21" x 27" (I just measured it) . Given that the X-13 has a foot print only about an inch bigger I would expect the shipping container to be roughly the same size, though taller.

I have 32" doorways and had no problems moving it.
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975/7075/SMS-1
Aperion Verus Grand Towers & Bookshelves, Verus Forte Center, Infinity Surrounds, Ultra-X12
Oppo BDP-203, XBOX360, Xbox One
LG 65" OLED
RR2150 w/Klipsch SCR-2