As an owner of the Andra II speakers, they are indeed made for playing loud, IMHO. I seriously doubt there is any problems with the speakers if you can't hear any problems yourself. (But it would not hurt to have them looked at before you buy them if you're truly that nervous.)
As far as overpowering them, I doubt the last owner actually opened up the Pass X600's to full power when playing them, as that would have been ear splitting. (There really is just so loud you can play any speaker - Well okay, except for those MBL demonstations at the Audio shows!) ;-)
I will bring up one thing though: If they truly are only two years old, you are probably fine, but I will point out that the earliest versions of the Andra II speakers had foam surrounds, (rather than rubber surrounds), and they could deteriorate with time depending upon your environment. (A fellow member had this happen to his, and he had to have them rebuilt by EgglestonWorks a couple of years ago.) You should check to make sure the ones you're considering have the rubber surrounds. (I have the rubber surrounds, and mine still sound great after four years, and I was the second owner too as a matter of fact.) I highly recommend the Andra II speakers.
Also, in case you're wondering, I use the 200 wpc Lamm M2.1 hybrid monoblocks, and they sound great with the Andra II speakers. I highly recommend them, or their successor, the 220 wpc Lamm M2.2s.
Good Luck with your decision.
As far as overpowering them, I doubt the last owner actually opened up the Pass X600's to full power when playing them, as that would have been ear splitting. (There really is just so loud you can play any speaker - Well okay, except for those MBL demonstations at the Audio shows!) ;-)
I will bring up one thing though: If they truly are only two years old, you are probably fine, but I will point out that the earliest versions of the Andra II speakers had foam surrounds, (rather than rubber surrounds), and they could deteriorate with time depending upon your environment. (A fellow member had this happen to his, and he had to have them rebuilt by EgglestonWorks a couple of years ago.) You should check to make sure the ones you're considering have the rubber surrounds. (I have the rubber surrounds, and mine still sound great after four years, and I was the second owner too as a matter of fact.) I highly recommend the Andra II speakers.
Also, in case you're wondering, I use the 200 wpc Lamm M2.1 hybrid monoblocks, and they sound great with the Andra II speakers. I highly recommend them, or their successor, the 220 wpc Lamm M2.2s.
Good Luck with your decision.