We're used to waiting for speakers to establish themselves before "signature" editions are issued, but Tannoy has skipped that convention by bringing out both its Revolution and Revolution Signature lines out at the same time. Both make use of the Dual Concentric point source drivers and rigid cabinetry the British firm is known for, but spring for the Signature upgrade and you'll also get treated to curved cabinets and a WideBand tweeter that extends out to 54kHz. In either lineup, you'll find DC4-named stand-mounted, floorstanding and LCR models that have a 0.75-inch tweeter and 4-inch mid/bass drivers; the Signature line also adds in DC6 models with 1-inch tweeters and (you guessed it) 6-inch mid/bass drivers. It's all available now, but this is Tannoy, so don't expect any bargain pricing.
Read - Tannoy Revolution
Read - Tannoy Revolution Signature