There's a pretty good set of directions on page 27 of the 950's manual for calibrating speakers -- setting the main volume to 0dB, going to the CHANNEL CALIBRATION menu, and using an SPL meter (such as this meter from Radio Shack) and the 950's test tones to set each channel's level to 75dB. In most systems and for most users, calibrating in this manner (calibrating to 75dB) works very well, but in large rooms or for users who like it loud it is sometimes not enough. In those cases, you can calibrate to 85dB -- adjust all of the speaker trim settings upward so that the test tones measure 85dB when the volume control is set to 0.

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