You may use a handheld SPL meter (available at most electronics
stores) set to the C-Weighting, Slow scale.
1. Make sure all speakers have been connected correctly.
2. Adjust the size, crossover and delay for each speaker in your system
as described in Step Three.
3. If you are using a handheld SPL meter with source material, such
as a test disc or another audio selection, play it now and adjust the
AVR’s master volume control until the meter measures 75dB.
4. There are several methods of adjusting the channel output levels,
using either the test tone or source materials. In all cases, you may
measure the channel levels in one of two ways:
a) By ear. Try to adjust the levels so that all channels sound equally loud.
b) Using a handheld SPL meter set to the C-Weighting, Slow scale. Try to
adjust each channel so that the meter reads 75dB.