One or two 10's never really worked for me. Four of course is another story entirely. I played a VR for years that I set up with a 10/12 combo and also had en early Budda Twinmaster with the same. Seems to get the best of both worlds. I'll probe ably setup an incoming Allen Encore head with the same - if I can find a 10" Fane Alnico to go with my 12" that is.