All, Does anyone know at what db I must measure the spl when use the Sound & Vision DVD for speaker calibration? No where on the DVD that gives a definitive setting instruction except for the chapter "how to use the RS meter" that shows the setting at 70. Based on what set in this chapter, I calibrate the speaker to 75db. The subwoofer has a 5db hot. Not sure that 75db is a designated level for this S&V DVD.