I started building a system around ARC units in 1980 and have changed them over the years as Pre's, Powers, Dacs, & CD Players have been superseded.
There have been few occasions when the change has been a retro grade step in terms of musicality and overall performance.
Bad moves:
LS2B to LS7 > loss of resolution.
Classic 150 to Ref 210 > gutless.
CD2 to CD7 > loss of soundstage.
Good moves:
PH7 to Ref Phono 2.
Ref 3 to Ref 5.
Ref 210 to Ref 610T.
There have been few occasions when the change has been a retro grade step in terms of musicality and overall performance.
Bad moves:
LS2B to LS7 > loss of resolution.
Classic 150 to Ref 210 > gutless.
CD2 to CD7 > loss of soundstage.
Good moves:
PH7 to Ref Phono 2.
Ref 3 to Ref 5.
Ref 210 to Ref 610T.