> >>>Could you comment on the impedance, I'm sure you understand it better
>>>>than I. The MX183 has a impedance of 150 ohms,
> >
>> Transformer output
>
>Presumably to match pro equipment better and handle longer cable runs?
Precisely. Though I put my rear 183s through a 40-foot cable and they
sound fine, someday when I measure it I wouldn't be surprised if
there's some roll-off.
> >>>the WL183 is spec'd at
>>>>1000 ohms.
> >
>> Direct FET output.
>
>Intended for short runs to higher impedance mic pre's?
Exactly.
> >>>I'm pretty sure my Portadisc is going to find the MX183 a
>>>>better match, as it's designed for low impedance mics like the MKH.
> >
>> I think the operative factor is the input impedance of the recorder's
> > mic input. If it's high enough to "bridge" the mic's source
>> impedance, it won't lose level by loading it down. "Bridging" means a
>> load 5 to ten times the source impedance. For a 1K source, that
>> would be 5 to 10K.
>>
>> Unfortunately, manufacturers usually don't tell you what the actual
>> load impedance of a mic input is; they'll rate it with the mic
>> impedance that it's designed to bridge, like a standard 150 ohms. 3K
>> is a typical mic preamp input impedance. Higher is better, but it's
>> hard to keep the noise down was the impedance rises, so it's a
>> trade-off.
>
>So, one could say at typical preamp input impedance the WL183 is
>probably not meeting the 5 to 10 times rule for the source? But the
>MX183 would meet that rule?
Yes, but at the cost of a loss in level. Only experiment will tell
which is better.
-Dan Dugan
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