Snell type B:any upgrades?

upgrade some other part of your system instead, changing the speakers is a long shot to better sound, and will destroy the resale. Better front end or improvements in other areas will make the speakers sound better.

I owned Snell tpye B's and I agree, they sound super. In fact, the Best sound I ever heard came from the Type B's.
My system at the time consisted of Krell KPS 20i CD player;
Threshold T2 preamp; T400 amp and all Transparent Reference
cabling. Just marvelous! The Threshold amps kept breaking
and one time fried all the drivers in one speaker. Threshold paid for the repair at the time. Also, the Krell
needed to go back to service more than I liked. The McCormack DNA2 Deluxe is a nice match ( and it doesn't break!} Joe

Snell Type A reference would be a logical choice. Or you could go one step farther and go with a Revel Studio or Salon, both of which are also design's of Kevin Voecks and only improve on his older Type A design.

Everyone forgot one possibility, the strongest one - upgraded crossover parts. Don't even think about changing any of the drivers. You will destroy the speaker. But upgraded coils, caps and resistors will make a substantial improvement. If you can get the crossovers out without doing any damage, ship 'em off to me, and in a week you'll have them back, and you'll hear greater liquidity, bass definition, and way less treble grain.

Hope you can excuse my crashing the party, but I used to sell at a shop (in the early-mid 90's) that handled these speakers, and never cottoned to their sound. To me, they sounded excessively bass-heavy, slow, colored in the mids, closed-in on top, and lacking in transparency and coherence. They also stuck me as being too big for the volume levels they were capable of delivering comfortably. (Just for the record, I did not feel that way about the less ambitious and smaller D, E, and K models, which I thought were outstandingly natural and musical for their respective modest price ranges - a paradox that only contributed to my disappointment with the larger Snells, not including the very fine A.) Obviously, not everyone will agree with that assessment, but to me, if you have the itch to make an improvement, I'd start by auditioning some newer speaker alternatives.