Well the less the box can move, the more forge the air in the box and the boot will be moved.

If you have to high a sound pressure level you will start making the boot and various parts of the car vibrate. This will sound sh*te to you and make the rest of the world p*ss themselves with laughter as they drive past.

Okay you convinced me

I will try placing it on the carpet with Velcro and see what the result is.

It's easy and cheap enough:thumbup:

This way if it's ok I can leave it and otherwise I can still pass by my dealer to bolt it down.

Thanks for your comments

Make sure you use industrial/heavy duty velcro and not just the home stuff.

It has a lot more grip.