Subs don't always work best in the positions you'd like them in for aesthetics

What Hsu does your friend have? You're an audiophile if you're here afaik, it's not a skill, just an enthusiasm for hi-fi reproduction. The f6 of the Rel 1508 is 21 hz which isn't all that impressive for a $1800 sub (what kind of discount can you get, tho?). How much does the aesthetic of the sub count in your room?