Can you refer me to a power conditioner that I can install at the service entrance? I have high frequency noise on my incoming AC. If I place my SPL meter by a power receptacle, it reads 95 dB. If I turn on the lights, it reads 85 dB. With the power off, my readings go down to a reasonable 40 dB. I have to calibrate my speakers with the lights off! I need a solution to this because the utility is not helping me.