> Also, is there a simple way to attenuate the microphone signal a bit, may=
be 6 to 12 dB, without worsening the self noise? I would like to run my M10=
at full gain since this is where Raimund's chart shows the preamp noise to=
be the quietest, but that is too much gain for the em172 under most record=
ing conditions.
John,
Without knowing all the parameters, this is difficult to answer. The
solution is to test the mic and recorder using the pile of bedclothes test=
method. This will give you an account of mic hiss which is usually the
annoying noise.
As you reduce the gain level, the mic hiss should reduce in proportion. At=
the point that recorder input noise becomes louder on the recording than th=
e
mic hiss, then you are losing s/n ratio.
There is nothing you can do about mic hiss, so as long as it is swamping th=
e
recorder noise, you have the optimum record level with the maximum headroom=
.
David Brinicombe
|