aard
Date: Wed Jan 10, 2007 12:11 am ((PST))
I have uploaded two files called line_input_RH1.wav and
mic_input_RH1.wav. They were recorded using a cable into the mic
preamp input that did not lead anywhere, and with gain up to 30. I did
this just to make it switch to the mic input instead of using the
line. The line file was just created pressing record on the device,
also with a gain of 30.
There is a distinct noise and also a lower tone in the mic recordings,
which make recordings unusable.
Hope these samples can help us narrow down the problem.
Sveinung
--- In Rob Danielson <> wrote:
>
> That suggests to me that the list of suspects is narrowed down to the
> unbalanced 2-xlr->stereo 3.5mm cable and the RH1/its settings. Can
> you borrow another recorder like an MD and another adapter cable? If
> the source of the noise is the RH1, TLM103 -> Art2 -> another
> adapter cable -> mic input/MD should confirm it and if so, send it
> to Sony Repair. Record the results to a sound file? It shouldn't be
> noisy. Rob D.
>
> >TLM103 to Art2 to mic input (red) on RH1=3Dnoisy (mostly high
> >frequency noise as far I can
> >tell)
> >
> >TLM103 to Art2 to mic pre on Motu 828mk2 and out line level on the
> >back into line/
> >optical on RH1 (white)=3DLow noise
> >
> >The Motu looks like this:
> >http://www.motu.com/products/motuaudio/828.Its preamps are
> >decent but not the best.
> >
> >*S*
> >
> >
> >
> >--- In Rob Danielson <type@> wrote:
> >>
> >> At 7:24 PM +0000 1/9/07, sveinung_nygaard wrote:
> >> >The RH1 is on batteri, the Art2 is running off battery, the 828 is
> >> >on mains. The miccable is
> >> >good, I use it all the time. The mic is fine too. I am running a
> >> >longish unbalanced cable
> >> >from the outputs of the 828, so that might cause some noise. The
> >> >funny things is when I
> >> >used the preamp
> >>
> >> What preamp? The art II is a phantom power supply. The output
from it
> >> goes to a mic level input.
> >>
> >>
> >> >on the 828 with all the same cables attacheds it was like I was
able to
> >> >breath again (almost no noise). And, this noise I have problem with
> >> >is the same as the one
> >> >I get when plugging a Sony ECM-MS907 into the RZ1 but not having
> >> >turned the mic on.
> >> >This is what suggests to me that the preamp has some noise in it. I
> >> >also get the same
> >> >noise plugging an ordinary cable into the preamp input.
> >>
> >> There are line and mic inputs on the Hi-MD. The Art II output
goes to
> >> the (red jack?) mic input on the Hi-MD. Rob D.
> >>
> >> >
> >> >*S*
> >> >
> >> >--- In "stoatwizard"
<linnet@> wrote:
> >> >>
> >> >> 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"
> >> >> <sveinung.s.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
> >> >>
> >> >
> >> >
> >> >
> >> >
> >> >"Microphones are not ears,
> >> >Loudspeakers are not birds,
> >> >A listening room is not nature."
> >> >Klas Strandberg
> >> >Yahoo! Groups Links
> >> >
> >> >
> >> >
> >>
> >>
> >> --
> >> Rob Danielson
> >> Peck School of the Arts
> >> University of Wisconsin-Milwaukee
> >> http://www.uwm.edu/~type/audio-art-tech-gallery/
> >>
> >
> >
> >
> >
> >"Microphones are not ears,
> >Loudspeakers are not birds,
> >A listening room is not nature."
> >Klas Strandberg
> >Yahoo! Groups Links
> >
> >
> >
>
>
> --
> Rob Danielson
> Peck School of the Arts
> University of Wisconsin-Milwaukee
> http://www.uwm.edu/~type/audio-art-tech-gallery/
>
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