i have the sub volume turned up just far enough that the sub plays if i turn it down just a pinch the speaker quits playing, that way the bass is not over powering the main speakers and blends in with the music as it should. the volume knob on the amp rarely gets turned up past 9 0-clock so i dont often play music really loud,. so i am not sure it would vibrate any thing off. i dont really feel any vibes in the sub cabinet. how ever when i decide to watch a movie i will probably crank the sub up a bit.
i just want to make sure i wont make my new amp die early by my hand. i really like this thing and i hope it will last for years to come. i know it seems like a dumb question but you never know, strange things can screw stuff up some times so better safe than sorry.