My uncle had classic co-auxial 15 incher, and they sounded warm and pleasant. They are classics for a reason.
But not all Tannoy offerings sound good = especially now.
The good sounding ones cost quite a bit. If you can find an old one that still is in good condition, that might be your ticket to sonic heaven.
http://www.tannoy-speakers.com/s.php?section=Residential&skin=white&sub=1
The prestige series sounded good - especially for classical, but they are quite expensive. Me thinks one can get similar quality for less.
Lesser offerings didn't do it for me - there are better alternatives out there - you might want to check out Canadian speakers like Paradigm, PSB, etc, if your price range is not upto the Tannoy prestige series.
Tannoys can sound really good - their top models, but lesser ones are not good values in audio - also they seem tobe over priced for what they do.
They seem to play this game of over charging - making buyers feel that there must be something to the high cost, when in reality, it's just over charging - compared to other companies.
Canadian speakers are good value - might want to audition them, before buying British speakers.
Paradigm studio sound good, and are reasonably priced - they are a little polite sounding speakers - if you like that quality in speakers.