If buying used nothing too old under 10 years old unless fully rebuilt,
and check for condition minimum ,Excellent to Mint, and quality of brand counts
they typically use better parts quality ibought some very good Dynaudio contour
loudspeakers like new and totally rewired and rebuilt the Xovers ,it is at least equal to any $10 speaker for a $5k investment.
with digital I would not. For Digital has progressed many times in the last 5 years.