David,
I took some time this morning when it was (fairly) quiet and recorded short=
samples with every combination of settings for high and low sensitivity wi=
th gain from 0 to 10 using both the internal mics on the PCM-M10 and with t=
he Sennheiser ME66/K6. I wasn=92t sure what would be the easiest way to mea=
sure the changes. I created spectrograms, and the change in noise is quiet =
visible. You can check the first batch here (Internal mics, high sensitivit=
y, 0-10 gain): http://imgur.com/a/jlQwL <http://imgur.com/a/jlQwL>
If you need to actually hear the sound samples let me know and I can edit o=
ut the leading and trailing sounds of my noting what the setting was and st=
uffing everything under a giant beanbag. Those pops that are visible on the=
spectrograms are from the foam in the beanbag, but it doesn=92t interfere =
with the ability to measure the hiss. I don=92t have a resistor yet, have t=
o visit somewhere locally I can get one.
As an aside, I note a consistent =85something=85 showing up at around 8.7 k=
Hz. Not sure what that might be?
> On Jun 13, 2015, at 11:50 AM, [naturerecordists] <nat=
> wrote:
>
> If you send me recordings of a few seconds with the mic and resistor at t=
he
> same high gain setting which doesn't overload with the rumble noise of th=
e
> house (put a bass cut in) I'll see if I can talk you through it.
>
> David Brinicombe
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