I had the Time Windows and they play well but not low, so a good sub should help them a bunch.
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I used to own a pair of Time Windows and I loved them. I found the bass to be very satisfying. The 2 smaller drivers allowed the bass to be very quick. I would be careful not to lose the quality with a subwoofer as the sub may cause the bass to be slower. Other than my current Gallo Ref 2's, the Time Windows were my favorite speakers.