|
Interestingly ,our perception of loudness is not the same as sound pressure level.Although the actual formula is some what complex,as a rule of thumb,an increase of 10db spl is perceived to be approximatly twice as loud.Thus a 20 db gain would seem to be about 4 times as loud,and a 40 db gain would seem to be about 16 times as loud.When talking about power,3 db represents a ratio of two to one,or a doubling of power.We use both stationary and pass by testing.It is more accurate for us to compare a stock 80db motorcycle with one of our systems using pass by including all the bikes noise,as that is what the rider is hearing.Also,pass by is the only test EPA considers valid on on highway motorcycles.I agree that a stationary db number gives customers a good comparison if they have a stock bike number from a stationary test.Some day I hope we can have a simple,comparitive sound test that EPA will let us as well as themselves use.Currently they are like a lot of dyno numbers,all over the place.
Say hello to Kevin from Richard and Mike
|
