The unit itself is over 70lbs, so it doesn't move with normal driving. I bought a 45" rubber strap (the one you see in the 4th pic) from a local hardware store, but that's mainly to make sure the unit stays in place during spirited driving. The unit itself does not vibrate at all, not even at max volume. It's kinda trippy because you have all this pounding bass, but when you touch the box, it's "calm".

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