This sounds like there is a fault. Neumann quote the sensitivity at a
decent 23mV/Pa and a self-noise of 7dBA, so the RH1 preamp noise costs
you about 2dB self-noise.
When I had one on loan to test the noise floor of the RH1 driven by a
180R resistive load had a slight hint of hum, which I suspect to being
due to the OLED display which has a 100Hz refresh rate.
One question - are you battery powering the phantom unit (ie there
isn't an earth loop with the phantom powering), since the RH! is not a
balanced input, so the phantom unit and mics should be fully floating
if possible?
--- In "sveinung_nygaard"
<> wrote:
> I might be mistaken, but it seems to me that the mic pre on the Sony
MZ-RH1 is very noise. If
> anybody cold lead me on the right track I would be very thankful. I
have one of these
> recorders, and I tried comparing it to the preamp on my MOTU 828 mk2,
and the mic pre on
> the sony recorder has a lot of high frequency noice on it. I used a
Neuman TLM103 with
> phantom from a ART2 box. It was all done indoor to check the
noiselevel (very crudely!). But
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