I am using SP 1/2 Es with a pair of REL Stadium subs, works very well. Use either MF M3 Nuvista [275 watts] or 4 Meridian 605 mono amps [300 total a side] to drive them. I would try a GOOD high powered transistor amp and see what I thought of the sound. I have several other speakers but these are the ones I spend the most time listening to. You are not going to get the same sound from another speaker, make sure you know what you are looking for before you switch.
Upgrade from Spendor SP 1/2, what's next?
I currently have a pair of original SP 1/2's and am upgrading from a Cayin TA-30 to a Cayin a88t to drive them. Listen mostly to classical and jazz vocals and love the sweet mellow warm sound. I'm considering trying a new speaker and was thinking of going to a floor stander. What Spendor floor standing speaker (or other maker) would you recommend? The room is 20' x 14' with 10' ceiling, wood floors, minimal furniture.