Only if the bass is overwhelming and or you don't have room for them to be away from the walls.
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I SURE DON'T NEED A SUB TOO VERY MUCH UNLESS IT'S WITH MOVIES IN MINE, USING A SIMILAR TOWER SPEAKER.
IT DOES COME DOWN TO THE BASS RESPONSE THOUGH.
if you are OK with it as is, it's OK.
I put my mains nito my office and run two ways all around in my bedroom HT rig witha 10 inch sub... ghosting the center ch... and just using an older Sony aV rec.
For me... this works fine, but it's not my main system either.