So sub or not to sub

Wolf, that's what I thought. Now - in relation the the two monitors, where's the best place Shirley would say to put the sub in the room?

Agree with Wolf, sort of. I'm not sure I agree about Shirley but, about a sub, yea. Try to get a sub with speaker level connections and run the signal out of the amp speaker taps. Phase and gain are all you really have to set. I know REL likes their x-over set below the mains low freq but, I've had success with my x-over all the way open.

Simao, try placement of the sub between the speakers and a little ahead of the plane their on.

I have a pair of Verity Parsifal Encores and a Rel Stadium III sub. I've had this system for a couple of years and haven't changed anything. I do on occasion turn off the sub, and sometimes will only play the monitors and let the lower cabinets remain as stands. All different sounds with different qualities. The midrange and staging sound the best with only the monitors. That's in my room.

Room treatment is important when adding more bass because you have additional waves moving around at different frequencies competing with the mains or monitors. I say go for it especially if you like low frequency sound and "movement". Even more if you can treat the room.