Posted by Richard Crowley on 08/28/07 18:56

"Rick Merrill" <rick0.merrill@NOSPAM.gmail.com> wrote in message
news:COCdnewyLocm90nbnZ2dnUVZ_tCrnZ2d@comcast.com...
> Richard Crowley wrote:
>> "Rick Merrill" wrote ...
>>> There is one more tiny thing: the feed is Mono while the camcorder is
>>> Stereo. Right now we have both L and R inputs wired together in the
>>> stereo jack from the Mono feed. Suppose I put the L and R Mic In in
>>> series?
>>
>> Perhaps you meant to put them in parallel. You can't
>> put them in "series". Feeding a mono signal into both
>> channels is a very common practice. Sometimes we
>> feed the house mix into one channel and a live mic
>> into the other channel. That gives you independent
>> redundancy, and the POV of the live audience. In some
>> cases (such as rock music performances), the direct
>> feed from the PA system is too "dry" and doesn't include
>> the non-amplified instruments, or the audience reaction,
>> etc.
>>
>>> That would increase the Mic in impedance by 4x.
>>
>> Putting two impedances in series increases the total
>> impedance by 2x, and putting them in parallel makes
>> the total 1/2 the individual impedances. But you can't
>> put the mic inputs in "series" unless you use a pair of
>> isolation transformers, etc.
>
> If you Could put them in series (presently in parallel) then
> the change would be 2x/(1/2).
>
>> Padding the mixer line-level output down to mic level
>> should not be dependent on the input impedance of
>> the camcorder. So impedance is a very minor factor
>> in your situation as you have explained it here.
>>
>>> Would that be a step in the right direction?
>>
>> Padding the line level down to mic level would be the
>> right direction. Using shielded cable would definitely
>> be the right direction.
>>
>> You could even consider recording the audio on some
>> other machine (that doesn't have AGC), but we don't
>> know what your production flow is and whether you
>> could accommodate separate sound recording? And
>> we don't even know what you are producing and how
>> much of a problem the "pumping" is?
>
> it's not much of a problem - just an annoyance to those
> of us who hear it / watch it.
>
> The dual input idea is a great one - and easy to mix in post, if I
> remember!
>
> Where can I get a nice, flexible shielded cable? Anybody got 25' to spare?
>

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