I'm about to close a deal on a pair of Tannoy System 800's but never heard them before, will only be able to audition them for a bit wheen meeting with the owner. What can I expect from these, and to look for in particular? Bit anxious tbh and would like to get my expectations down to earth in the meanwhile?

I intend to use them with some vintage gear, good quality Sansui's or similar equipaments from that era, Luxman L-80 etc...