Estate Sale Find

Found a brand new pair of Acoustic Research AR-1 High Res speakers packed in there original unopened box They were purchased in 2000 and have been stored in a basement since then. They have side firing 500 watt subs with a built in Carver amps. the drivers look fine and the subs did turn on. Should I break them in at low volume and for how long? I paid $200 for them so it is worth the gamble on them. Your thoughts.