better sound?

Does it make the sound quality or effect (like shaking of the car) better or stronger if you bolt your box to the trunk floor.

Here is my thoughts on this as taught to me from a very old and wise person.

If your box is moving aroud your vehicle, it is losing all sorts of energy that should be produced as sound. So yes it will not only have an effect on SPL, but SQ as well. Never mind the fact that it is a missile in an accident. A speaker makes energy on both strokes, in and out. You don't want the box to rob your tonal response of output in any form, be it in SPL or SQ based on the box rattling around or things inside of the box rattling around.

So Forbidden you were born around the middle 1600's and early 1700's with Mr. Newton? Very interesting

I have found that using old cd changer brakets is convenient for holding enclosures in place. Make sure the metal versions are used, not the plastic ones. Not only will the metal ones hold a little better, they are some what pliable and this can be good for angled boxes. I usually place the box where I want it, mark it and then screw my brakets down wih bottom part of the "L" under the box. Paint them and they look good too.