Big Oakden

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I have a general AMA Db Testing Question:

What is the ground surface required to be for proper AMA Db Limit Testing:
Grass?
Pavement?
Concrete?
Rolled Granite?
What?

I know that a lot of the clubs in the eastern US fly off of grass. Some fly off of Concrete, and some off of Asphalt....

So what is the rule specific to?

There is a major difference in Db levels when testing off any of the above surfaces. And our club is starting to become very stringent regarding Db levels.

(My plane passed with a 98Db (on Asphalt), but I would still like to know)

Any help, or knowledge anyone can impart would be helpful

Thanks,

Dave