I don't have subs - yet, at least - but I haven't missed bass a whole lot with HT. But my case may not be typical; my speakers go down to 40 Hz, I don't like exaggerated bass, only what's there; and most of my listening is to classical music. If I get sub(s) it would be to get the last octave-and-a-half on pipe organ recordings and to get a better idea of the overall acoustic of the recording venue. Your taste may vary and probably does.