<<I have a Sennheiser ME 66 with a K 6 powering module. I have used it
with a Sony MZ-R37 with moderately good results. The principle
problem being the time to down load the sound files in real time, cut
them up into sepperate files and keep comments on the files. Recently
I have started to use a Olympus DS-40 Digital voice recorder. The big
advantages are that I can carry it with me everywhere, it has a high
recording level (compared to other DVRs) and I can download via USB.
I have tried using the DS-40 with the Sennheiser. This gives me great
volume but an unacceptably high noise level. My question is, is this
an impendance problem?>>
Not really. This is a design problem. A digital voice recorder has no
need to provide pristine accurate audio. It merely needs to provide
intelligible speech, which is not a very high standard. The makers of
these devices get by with what we would consider very compromised
audio quality.
<< The Sennheiser lists 200 ohms balanced and the
DS-40 lists 680 ohms. If it is an impedance problem, how do I solve
it?>>
Ideally you want either a one to one impedance match, or about a one
to ten ratio of low impedance driving a higher impedance. For mics,
you're in a very acceptable range here, though. Your noise is not
caused by any impedance mismatch. It's a result of a very basic
inexpensive analog preamp feeding a low bit rate A-D converter. No
way around that.
Scott Fraser
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