I've owned the same CD player since I was in Jr. High, the same DVD player since maybe a year after the PS2 came out. I've had my Xbox since it came out, and I've had my Gamecube since it came out. The CD player in my car has been there for three years. Aside from my PS2 going bad, I'm yet to have to recalibrate any of them.
So.....you use each of those devices for 3-4 hrs daily?