Larry, sure I occasionally measure this, but keep in mind that it's more important to watch how hard you push your ears, rather than just your speakers. A comfortably loud average level, which is safe from the standpoint of long-term hearing damage, is around 80dB and in casual listening I might use about 10dB lower than this. Some of the highly dynamic classical recordings that I listen to would have very brief peaks as much as 20dB above the average level, resulting in a peak level of about 100dB when I'm listening "loud".
