|
I should have known better - there is an app just about for everything that one can think of... so, i found an app that gave some idea of the frequency of the whine...
as you can see, the whine is settled in the vicinity of 4-5kHz, with majority of the whine occurring at 4300 Hz +- 200 hz
Not now but sometime over this weekend i am going to do more measurements and calculate the values for the filter and try it again, just to see if it works or not...
the higher level of noise at the very bottom of the spectrum is from the engine revving...
|