I actually own both a REF 75 and a DS 225 - not quite the 450, but I doubt the difference in sound between the 225 and 450 is meaningful. The 225 has a more solid, well-defined bottom end, but is a little brighter at the top. Just about exactly what you would expect for vacuum tube vs. solid state. But the Ref 75 has plenty of bass and is silky smooth from top to bottom -- and has better imaging than the 225. All in all, I spend way more time with the 75 in my system than the 225. I also love the fact that the 75 can be biased from the front panel (unlike most ARC tube amps), and that when it is time to replace the tubes, I can get a complete set of replacements from either Tube Depot or The Tube Store for under $250.00.
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