I stand corrected. Yes the center is the RC-64 as you pointed out. It's still going to be a tough call between the 83's & the 63's. I think I read somewhere that the fellow that designed the 83 & 63 said that the 63's are his favorite for music. Don't quote me on that though. I think he even pointed out what separated the two models but that tid-bit of information escapes me at the moment.