“Unless you are prepared to use a sub.....Open baffle are not a good Idea....I have 2 pair and rarely hook them up anymore.”
In my rooms, dual subs (at minimum) are a given… before I even decide which mains I’m going to use.
If all your running is a pair of left and right mains in an average room (with four walls, a floor and a ceiling) and the addition of a couple subs makes the overall bass response worse…then I’d say you most certainly have either the gain or crossover frequency (or both) of the subs set too high.
This is only if your in a typical room and therefore have the expected boundary interference.
If you move outside, or even half outside the rules (physics) change
Obviously the degree of room treatments can change the game somewhat, but I still always use both (multiple subs and room treatments) for that clean, tight punchy bass goodness…