I think the neutral sound of most Tannoys surprise some people. You didn't mention the amp you are using. Personally I feel tube amps sound more muted with these speakers. I do not know if this is your case.
If you can, try moving them further away from the wall or corners. Speaker spikes may also make a difference although it is "mostly a muddy bass fix". These are good sounding speakers. I have just sold a pair of S8LRs and they have a similar sound. I have a pair of S6LRs and a S6C for sale if you are interested. I have now started my larger floor-standing speakers. Good luck.
If you can, try moving them further away from the wall or corners. Speaker spikes may also make a difference although it is "mostly a muddy bass fix". These are good sounding speakers. I have just sold a pair of S8LRs and they have a similar sound. I have a pair of S6LRs and a S6C for sale if you are interested. I have now started my larger floor-standing speakers. Good luck.