Subwoofer

Baloney...I used one REL Q150 for years and it sounded great, and still use that one now along with a Q108MK2...still...one properly adjusted sub can work beautifully in any room.

@mahgister , it is good to 'see' you again...*vbs*

As one who's lived through both of the '60's', we're becoming rare instead of being merely 'well done'....;)

As for 'subbing it', a single self driven 8" for the moment, considering an array of 4; 2 - 8~10" left & right 'front", 2 - 6~8" L & R 'rear'...although 'placement' and levels subject to measure and taste....self-driven, perhaps...

All of which subject to the vagrancies of time, space, and budget....I need obedient clones....*L* 

I second the suggestion of a twin driver sub, I recently went from an old rel stentor III to a studio III. night and day better, smoother bass response at the listening position.

Find an audio buddy who will loan you a sub.  Install it in your "only" location, and make sure it isn't a "suck out" node in your room at which all low freq disappears, or a node which exaggerates low freq regardless of what adjustments you make.  If either of those conditions persists, forget the sub and be thankful you just saved yourself a bunch of $$.

What’s your budget ?  Both JL audio, and Rel have a stacked model 2 in 1 space