Be sure you have level control to the monitors-don't send full mix output to them or damage may occur!
Really? What do you mean by this -- like if I have my monitors hooked up through my apogee duet's outs and i'm using logic, do i need to do something special to make sure they don't' get messed up? I don't turn it up crazy loud or anything, but I do usually try to master everything right at 0db.
Sorry if I was not clear.
I meant some way to control the level going to the speakers if they are powered or the power amp if used.
A "volume" control somewhere.
You do want to mix so the level reaches close to 0 dB full scale (leave some headroom for mastering).
You generally don't want to send that level straight to the monitors-it may not damage the speakers bit it will be might loud.
Most mastering guys I have dealt with and CD's I play and check reach -0.2 dB re: 0 dB full scale. That's only 2 tenths of a dB below 0.
That is plenty to avoid crummy CD players DAC's crapping out.
Only mastering to -3 dB is wasting 2.8 dB and makes it harder to compete in the loudness war.