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Adjust the master volume of your Receiver/Preamp to a common listening level you are accustomed to (say 75dB).
Audio Level AdjustmentsLevel calibration between all of your speakers in a 5.1 system is one of the most important adjustable parameters. Many people tend to boost the rear speaker levels too high relative to the fronts and center channels. This sometimes tends to overemphasis the rear channels resulting in an unnatural surround field that is easily localized by the ear. Over emphasizing a particular channel sound level will diminish the balance in the system. Doing so undermines what the recording engineering intended the mix to sound for the movie and/or music CD. I recommend the following procedure for proper level calibration of your 5.1 Surround System:Select a common listening position. Adjust the master volume of your Receiver/Preamp to a common listening level you are accustomed to (say 75dB). Initiate the Receiver/Preamp test tone. Allow the test tone to sweep each speaker in your system. Adjust the volume levels of each channel until they sound similar in volume.� It is preferable to use an SPL meter (C-weighing, Fast Response) for greater accuracy.� � This is the first step in calibrating the sound levels of your 5.1 system. Please remember that these levels will need to be tweaked depending on the source recording and/or surround scheme.For example: Some recordings may boost the rear channels 1-3db higher than nominal due to poor mixing methods or deliberate wow factor. If the rear levels sound too loud when watching a movie or listening to a 5.1/6.1/7.1 audio mix, simply lower them until they sound balanced relative to the front and center channels.I recommend acquiring a multi channel set-up disc such as the one from Avia, Sound & Vision, or DTS. It will help you calibrate your listening levels of your speakers and subwoofer as it sweeps frequencies 20Hz to 20KHz for all channels. If you don't trust your ears, you may wish to purchase a Radio Shack SPL meter. When operating the test tone of your Receiver/Preamp, calibrate the volume levels within 1 dB relative to each channel. Hold the unit so that the microphone is pointed at the ceiling and position the microphone as closely to ear level as possible (at the sweet spot listening position) when running this test.Note: Make sure you set the scale to "C-Weighted" on the SPL meter as this closely matches a flat frequency response curve throughout the audible band.
Speaker CalibrationThe primary purpose of speaker calibration is to make sure speaker wires are connected properly, make sure each speaker is balanced to the others, and to make sure the subwoofer crossover is working. While fully balancing the speakers at all frequency ranges is ideal, it is usually impossible for a typical home theater.The following THX Optimizer tests will ensure your system is properly calibrated.75db Speaker Balance to make sure all speakers are all working at the same volume level. This requires the use of the Radio Shack SPL meter Speaker Phase Check to make sure connections to the speakers are correct. Low Frequency Sweep to check the speaker to subwoofer crossover.
Finally, you'll need to make sure that all of the speakers are equal in level. Your receiver can send a test tone to each speaker, which will help you adjust the relative volume of each channel. As the sound jumps from speaker to speaker, the loudness should stay the same. You can adjust the level of each speaker by ear or you can
