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Audyssey® Setup
To perform measurement, place the Sound calibration microphone in multiple locations all around the listening area. For best results, we recommend you measure in six or more positions, as shown in the illustration (up to eight positions).
When measuring the second and subsequent positions, install the Sound calibration microphone within 2 ft (60 cm) of the first measurement position (main listening position).
If you perform Audyssey® Setup, Audyssey MultEQ® XT, Audyssey Dynamic EQ® and Audyssey Dynamic Volume® functions are enabled. link
About the main listening position
The main listening position is the position where listeners would normally sit or where one would normally sit alone within the listening environment. Before starting Audyssey® Setup, place the Sound calibration microphone in the main listening position.
Audyssey MultEQ® XT uses the measurements from this position to calculate speaker distance, level, polarity, and the optimum crossover value for the subwoofer.
NOTE
Make the room as quiet as possible. Background noise can disrupt the room measurements. Close windows and turn off the power on electronic devices (radios, air conditioners, fluorescent lights, etc.). The measurements could be affected by the sounds emitted by such devices.
During the measurement process, place cell phones outside the listening room. Cell phone signals could disrupt the measurements.
Do not stand between the speakers and Sound calibration microphone or allow obstacles in the path while the measurements are being made. Also, install the Sound calibration microphone at least 20 inches (50 cm) away from the wall. Failure to do so will result in inaccurate readings.
During the measurement process, audible test tones will come from the speakers and subwoofer(s), but this is part of normal operation. If there is background noise in the room, these test signals will increase in volume.
Operating VOLUME 
on the remote control unit or VOLUME on the main unit during the measurements will cancel the measurements.
Measurement cannot be performed when headphones are connected. Unplug the headphones before performing Audyssey® Setup.