The older G12T75's are much smoother on the top end than the newer G12T75's, maybe due to break-in or aging, but definitely better sounding to my ears. If I needed more 75's, then I'd look for the vintage G12T75's with the magnet vent like the G12-65's. I've also tried the G12M70's with G12T75's and thats a good pairing, too. Seems like the 75's mix well with most other Celestions. But, I ended up with an A cab full of 3 different GBs and a B cab full of G12-80's with 444 bass cones.