Hi Gianni,
The noise floor of the K6/ME66 in the audible range (below 20 kHz)
should be the identical in both the phantom and battery powering mode.
If there is an audible difference, then there must be something wrong
with your individual microphones. A few years ago I purchased a used
K6/ME66 off eBay, which also produced an increased noise floor in the
battery powering mode. It was necessary to send it to Sennheiser for
repair (they replaced a damaged capacitor).
The noise component around 35 kHz (originating from the internal DC/DC
converter) is the normal behaviour of the K6 module. However, I see no
problem with that phenomenon because this kind of noise is completely
outside of the usable frequency range of this microphone.
> I checked an old K6/ME6 (more than 15 years old)
I guess that you mean the old K3/ME80 here.
Regards,
Raimund
--- In Gianni Pavan <> wrote:
>
> Hi,
> I just bought two Sennheiser K6/ME66 with the hope to use them on
> small recorders lacking phantom power (HiMD, Kork MR-1) or with bad
> phantom (MicroTrack 2496). Unfortunately I had a bad surprise: when
> powered by phantom the K6/ME66 works fine, but when powered by its
> internal battery his noise increases above 8-10 kHz by about 12 dB
> and a strong and large peak of noise (36dB higher than the
> background) appears in the range 30-40 kHz. I have two K6/ME66, one
> with peak at 32kHz, the other with peak at 37kHz. I exchanged the
> batteries with no differencies. This makes them completely unusable
> at 96 kHz and also at 48 kHz the noise increase is well appreciable
> when running on internal batteries.
> I'm VERY disappointed by this. I checked an old K6/ME6 (more than 15
> years old) and it has a similar peak but narrower and weaker with no
> background increase; I also noted that both noise were higher in the
> old model (something like 4-5 dB).
>
> Now I'd like to know if somebody else has experienced the same
> problem with Sennheiser or with other brands.
>
> Gianni
>
> Gianni
>
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> Gianni Pavan
> Centro Interdisciplinare di Bioacustica e Ricerche Ambientali
> Universita' degli Studi di Pavia, Via Taramelli 24, 27100 PAVIA, ITALIA
> Phone +39-0382-987874 Fax +39-02-700-32921
> Email
> Web http://www.unipv.it/cibra
>
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> http://www.unipv.it/cibra/xxi_ibac.html
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