Does anyone have a schematic diagram over the RH1 input stage?
Among the low voltage amp's, it is the best, - better than what can
be made with standard discrete transistors.
Or is it a Sony exclusive, not possible to copy?
Klas.
At 11:16 2006-12-28, you wrote:
>jpbeale wrote:
>
> > I think the Sony MZ-RH1 has already been carefully studied by many
> > more qualified. But just to add to the available data, I measured mine
> > to have an input noise level of -122.8 dBu (A-weighting) using the mic
> > input with "High" sensitivity and +30 recording level. Graphs from
> > RMAA are shown on the pages below. The mic input shows a bit more
> > rolloff at low frequencies than line input.
> >
> > http://beale.best.vwh.net/measure/audio/MZ-RH1_MIC.htm
> > http://beale.best.vwh.net/measure/audio/Sony_MZ-RH1_line-in.htm
> >
> > Since my audio attenuator has an output impedance of 1 kohm it may be
> > slightly more noisy than a 150 ohm source (about -127 vs -129 dBu I
> > think).
>
>Thank you very much sharing your professional measurements.
>
>I agree that the relatively high output impedance of 1 kohm results in
>a higher noise level. Though, I guess that a 150 ohm source might
>improve the noise figure by more than 2 dB. You could measure the
>noise at 150 ohm simply by replacing your attenuator by a plain
>resistor of that size. The 1 kHz reference signal with the attenuator
>are only required to calibrate the setup. Unfortunately, this change
>of the output impedance might also slightly change the input
>sensitivity of the recorder (depending on its input impedance).
>
>Regards,
>Raimund
>
>
>
>
>
>"Microphones are not ears,
>Loudspeakers are not birds,
>A listening room is not nature."
>Klas Strandberg
>Yahoo! Groups Links
>
>
>
Telinga Microphones, Botarbo,
S-748 96 Tobo, Sweden.
Phone & fax int + 295 310 01
email:
website: www.telinga.com
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