I guess my point was that it doesn't matter where you are in the vehicle, vibrations occur. I used SPL as an example because even at the windshield you're talking 150db's. That's more noise than majority of daily driver installs at a 1 meter distance. Best buy and Circuit City had installs like that all day. Daily routine is strap an amp to the back seat and put some subs next to it. I had subs firing at an amp for 5 years without issue. It's luck of the draw...but it's not placement of the amp, it's installation.