I would recommend a small sub. The rated lowest frequency for your speakers is stated to be 65 Hz, I assume at -3 dB. You are missing some of the music. I have Von Schweikert VR-1s, roughly the same frequency response. I added an REL Q108E and I only notice it when I turn it off, but then I realize how much information I am missing. It seems to make the midrange better. TUning it is a challenge. You don't want to "hear" it at all. I like the REL because it is closed, not ported, and it is small. My room is roughly 10' x 13' with a vaulted ceiling and one wide doorway. I tried it without the sub and keep going back to it. It makes music better.