I would guess this would be a fantastic combo. I'm sure back in the day there were plenty of JBL's powered by MC275's Heck the ultimate would be a pair of 275's
Matching JBL and McIntosh
I am currently breaking in a pair of JBL L100 Classic speakers which I purchased from Audio Classics on Dec 15th. These are in my secondary system and a McIntosh MA6600 200wpc Integrated is driving them. I am thinking of trading in my integrated and going with a McIntosh MC275 tube amp and a McIntosh C47 preamp.. Has anyone tried the JBL's with a 75wpc tube amp and if so, how did you like the sound?