Raise the master volume of the receiver until the SPL meter reads about 75 dBC (it’ll jump around, but you’ll just have to try to get it as close as you can). You can simply remove the battery, and put the unit away until next time. Color: Analog Sound Calibrator The calibrator generates these fixed sound level signals for calibration of sound level meters. You can use a simple $35 SPL meter to calibrate surround sound levels in each channel of your home theater system. Or you could choose to calibrate it once more now that it has been used. The unit ships with a ½" adaptor installed to accommodate sound meters and microphones with 1" or 1/2" microphone. Go through each speaker, adjusting each to hit the same level on your SPL meter, including your subwoofer. It is not possible to over-calibrate a sound level meter. To do this, set the appropriate crossover for your speakers and then follow these basic steps: Go into the System Setup menu of your AV … This model works with any digital sound level meter. Sound level meters are a very interesting little device.