Again, this is utter hogwash..
"But even ARC admits that with a few upgraded parts the SP6 can sound substantially like their current preamp offerings. If that's the case, then the difference between the Ref 3 and the Ref 5 really is very, very small. Whether or not that very, very small difference is worthwhile or valued is a separate question"
If you've heard both the pieces in a system, you would not be making such assertions. Agreed, sometimes with this hobby it can involve diminishing returns, but not in this case. To the OP, the LS 27 settles nicely between the REF3 and the REF5. Do go listen to it if you can. I'm not sure what you've been using or comparison shopping for, but in the $7k range it's a winner.
"But even ARC admits that with a few upgraded parts the SP6 can sound substantially like their current preamp offerings. If that's the case, then the difference between the Ref 3 and the Ref 5 really is very, very small. Whether or not that very, very small difference is worthwhile or valued is a separate question"
If you've heard both the pieces in a system, you would not be making such assertions. Agreed, sometimes with this hobby it can involve diminishing returns, but not in this case. To the OP, the LS 27 settles nicely between the REF3 and the REF5. Do go listen to it if you can. I'm not sure what you've been using or comparison shopping for, but in the $7k range it's a winner.