in addition to the David reply, I would say that splitting the signal to
the two channel inputs allows you to set the recording level of the second
channel at lower level. By recording the second channel, say, 10 or 20 dB
lower gives you more chances to get a good recording even when the source
comes so close to the mic to provoke overload of the high level channel,
but not on the second channel !
Gianni
2014-10-30 2:12 GMT+01:00 [naturerecordists] <
>:
>
>
> > I am currently using the basic stereo mode on my Zoom H4N recorder
> together with a Sennheiser ME67/K6. When I only use one channel on my
> recorder, I get a high pitched signal coming from the unused channel.
>
> Kent,
>
> You can't expect a high all-round performance from an affordable recorder=
.
> However, many low price digital recorders are very good, but only if you
> use
> them as intended.
>
> What did you do with the unused input? Probably the interference you hear=
d
> was digital "splash". Try shorting out the input of the unused channel
> with
> a short piece of wire.
>
> > I can always remove the =E2=80=9Cempty=E2=80=9D channel with the unwant=
ed signal
> afterwards in Audacity, but would like not to have to do that.
>
> Converting s stereo recording to mono requires a deliberate decision. The
> cleanest way is to use the wanted channel only which is easiest in a soun=
d
> editor, and which you will need anyway for editing out a wanted section
> and
> putting in fade-ins and fade-outs for presentation.
>
> Without post editing, you would have to get the recording level exactly
> right with unpredictable subjects which is impossible. Using an automatic
> level function causes "pumping" of background sounds which sounds awful o=
n
> a
> wildlife recording. The desired method is to record low - which you can d=
o
> with digital recording without loss of quality - and edit and adjust the
> level later. One click with Audacity "Normalize".
>
> > Therefore I have tried engaging mono mix in order to blend the left and
> right signals down to mono. Nice function, but that does not removed the
> unwanted noise from the empty channel, but instead just adds the high
> pitched signal it to the mono recording.
>
> Even if you didn't have the digital noise in the second channel, you woul=
d
> still be adding input stage noise to your recording, theoretically at
> least
> 3dB.
>
> > I now consider getting a "Y" cable to feed the signal from the
> Sennheiser to both stereo channels.
>
> That would work and could actually give 3dB less system noise. I said
> "could" not "would".
>
> Possibly just shorting out the unused input would also work, but you need
> to
> test this first. You don't need a plug, just a wire between the terminals=
.
> You can check the higher frequency hiss noise with and without a mic and
> with and without a shorting link by using the pile of bedclothes test
> which
> I frequently recommend. You don't need to measure anything, just listen
> back
> for the hiss levels on each option, of course leaving the record volume
> setting constant.
>
> What is best is what sounds best, whatever the theory. Trust your ears.
>
> David Brinicombe
>
>
>
--
Centro Interdisciplinare di Bioacustica e Ricerche Ambientali
Universit=C3=A0 degli Studi di Pavia
Via Taramelli 24, 27100 Pavia
http://www.unipv.it/cibra
http://mammiferimarini.unipv.it
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
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