The Q900 has such a good bass response that almost no one would find a subwoofer to be needed.

9 out of 10 people will end up wanting a subwoofer with the Tannoy speakers (sooner or later...lol).

Personally, I am not a huge fan of the Q900 speakers, but they are certainly good speakers; it's a matter of whether you like their tonal balance or not.

I think that the PSB Image T6 is a better-sounding speaker overall, and if you get those and add a NHT B12D subwoofer you would have a superb system for about the same price. Both the Absolute Sound and Stereophile picked the Image T6 as best of class and recommended them for system packages repeatedly,