How can I measure the low frequency signal coming out of my Yamaha HTR-3063? I set my DMM to acmillivolts, it showed the signal for all the other speakers FL. FR, C, SL, SR, they were all OK. Im sure Ive set the menu for the subwoofer right, I have the S/W set to ""Yes"" all sound levels are turned up and all other speakers set to small, S/W crossover is set to 120hz and phase set to normal. I have my TV connected to the Yamaha with an optical cable to AV1.This is the first time Ive tried to use a subwoofer on the Yammy since new. Ive made sure to pick a 5.1 digital TV signal with a lot of low frequencies like music programs when testing for low freq signals. Am I doing something wrong testing for low frequencies or is the Yammy playing up?