On Thu, Jun 06, 2013 at 01:32:08PM +0200, Jörn Nettingsmeier wrote:
> gigaport hd+ connected to a micstasy line in at normal Z (5.6kOhm
So dynamic range should be 88.4 - 13 or around 75 dB.
No really impressive...
> now if i feed it a white noise signal from JAAA at -1.0dBFS, the
That would be a really invalid measurement. Peak / RMS ratio for
jaaa's noise generator is something like 12dB, so noise at -1 dB
RMS will be clipping as hell. That 12 dB is an implementation
limit, real gaussian noise has (in theory) an infinite peak / RMS
ratio. So better stay at -20 dB RMS or so.
> the -1.0dbFS sine tone at 1kHz shows a first harmonic at -95dB, and
> however, there is a thumping DC impulse every few seconds which
Very suspect. Should be interesting to record the waveform and
have a look at it (zita-scope would be handy, but not yet ready
for the real world).
> a white noise steady-state spectrum shows a slight raise of 2.5dB
Again suspect, but see above. Could you try with a lower noise
General remark about the Jaaa screenshots: to measure noise you
should really use the noise, not peak, markers.
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