Read the instructions which came with the Sony, your issue may not be an issue at all since some Sony subs are activated by input, not powering on. Also, the Sony instructions may indicate the appropriate settings to make to your AVR's bass management features: low pass filter setting, high pass filter setting, bass volume level (set by Sound Pressure Level, not by ear), sound delay, and bass amplifier gain adjustment. These adjustments are real easy to make, some,in fact can be made by the AVR's auto calibration features, the only thing hard might be navigating through your AVR's menu. If you are confused about high and low pass settings, initially set low pass to 60 Hz and high pass to 50 Hz. Those settings will accomodate main speaker integration to the sub at a happy place. Last thing, from your AVR's speaker configuration menu you will make distance, and volume adjustment to each speaker. It's very important that you set the sub using a sound pressure meter, like one you can download to a phone, to match the sound pressure level of the main speakers. If you instead adjust by ear bass will dominate music and movies.