My parents have become very hard of hearing in the recent years. They play their tv so loud I can hear it in their driveway. Now they complain about the tv volume going up and down by itself. I've tried explaining that all things are not broadcast the same, causing the volume to be at different levels. Tonights question: If I hook my surround sound system to their tv, will the volume stable or will it continue to raise and lower? *haven't had my surround sound hooked up in forever. My wife didn't like it as much as I did. I could shake the windows. Literally.