Originally Posted by F.I. Inc.

Here is the best way to rate the sound.

1 being the loudest and 10 being the quietest.

1: Non Res / 2 / 3 / 4: 12" / 5 / 6 / 7 / 8 / 9 / 10: 18"

That is my scale when explaining it over the phone. This scale specifically pertains to interior noise resonance.

If you have any questions at all, please do not hesitate to call me directly...

Thank you, Tony