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## Re: Good mics, medium mics, the best mics - what's the difference o

 Subject: Re: Good mics, medium mics, the best mics - what's the difference o rock_scallop Tue Jun 17, 2014 12:18 pm ((PDT))
 ```Hi David,=0D =0D >My Sennheiser MKH416's have an HF noise level which is usually drowned by = =0D natural hiss from wind on leaves and a distant stream, but the pile of =0D bedclothes test reveals an HF tip-up which is close to where the thermal = =0D noise of air would be. One day I will prove this by putting it Into a =0D vacuum.=0D =0D Looking at the MKH416 product sheet, the frequency plot shows a boost in th= e higher frequencies. It could be what you think you are hearing as thermal= noise of air is just the amplification of those frequencies.=0D =0D >We've got such a rule, the sound level from a single source drops 6dB eve= ry =0D time you double the distance, plus some other factors like HF sound =0D absorption. If you can get closer to a wildlife sound source, you can alwa= ys =0D improve the signal to background-plus-mic noise ratio. =0D =0D Yes I know, that 5dB rule is what I was referring to. What I was wondering = is could the 6dB rule mic also be applied to mic-self noise? For instance i= f one compared side by a mice with 10dB self-noise and one with 14dB self-n= oise, might that translate to the 10dB mic recording lowest level sounds at= twice the distance as the 14dB?=0D =0D >Whose definition of "self noise" would you use? To have any meaning, this= =0D has to be an "equivalent self noise" in other words the acoustic noise lev= el =0D in Phons which would give the same noise level as the mic itself, in other= =0D words a sound which would raise the total mic noise level by 3dB. =0D =0D I would just use dB A-weighted, as that is the most common format. I know = you do not like it, but I think trying to convert everything to Phons would= just add unnecessary complexity. =0D =0D Regarding the rest of your reply, I agree that a manufactures specs cannot = always be taken as accurate. That is one of the reasons I follow this group= - to get recommendations on equipment by others who have tested it out. T= hat said, when I bought my Rode NT1-A mics years ago, it was just on the se= lf-noise spec alone, because I was not a member of this group yet, and had = no one to turn to for equipment advice. In that regard, I was lucky becaus= e it turned out to be a great mic for me.=0D =0D John Hartog=0D rockscallop.org ```
 Current Thread Re: Good mics, medium mics, the best mics - what's the difference o, john_hartog Re: Good mics, medium mics, the best mics - what's the difference o, 303 Re: Good mics, medium mics, the best mics - what's the difference o, john_hartog <=