Houston, the subwoofer has landed!
A couple of small dents on the box, but otherwise Fedex did no harm, especially given the amount of styrofoam enclosing it!
After 15 minutes of extracting the sub from the plastic wrap, (

), I ran it upstairs and hooked it up to the waiting RCA outputs from my LIO and plugged it in to confirm operation - all good! Until I get my home network re-sorted, I won't be able to feed it from my Roon server, but I'll keep it playing from Amazon music via my Echo Dot to break in the woofer surround. I'll wait to tune the settings until break-in completes as well. In the meantime, I'll look around for some isolation footers to minimize the contribution from my suspended wood floor.
Thanks again, Louis - this will be fun!