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RME User Forum → MADI/AES Premium Line → Win10 UFX+ Thnderbolt 192kHz issues
Hi,
At present when I set the Fireface UFX+ interface to 192kHz in TotalMix, I can see the hardware inputs moving as if there were receiving signal. Buffer size doesn't affect this behaviour.
If I use any other lower than 96kHz sample rate meters remain static (as it is supposed to be).
I have latest drivers (1.10) and latest firmware update.
Has anyone seen something like this?
Front lcd panel behaves exactly the same.
Here's a video showing the issue
ADAT = 8 channels @44.1/48 kHz
And by channel multiplexing: 4 channels @96 kHz or 2 channels @192 kHz
So in your Video you see @192 kHz only 2 ADAT channels, as 4 channels @48 kHz are multiplex to one @192 kHz.
Therefore its nice to have MADI with the UFX+ .. with ADAT you loose many channels at higher sample frequencies.
MADI offers 64 channels, so you can run 16 channels @192 kHz with MADI.
So i.e. 4 XTC with all Mic channels @96 kHz or 2 XTC via Madi with all Mic channels @192 kHz.
ADAT = 8 channels @44.1/48 kHz
And by channel multiplexing: 4 channels @96 kHz or 2 channels @192 kHzSo in your Video you see @192 kHz only 2 ADAT channels, as 4 channels @48 kHz are multiplex to one @192 kHz.
Therefore its nice to have MADI with the UFX+ .. with ADAT you loose many channels at higher sample frequencies.
MADI offers 64 channels, so you can run 16 channels @192 kHz with MADI.So i.e. 4 XTC with all Mic channels @96 kHz or 2 XTC via Madi with all Mic channels @192 kHz.
Dear remses, thank you very much for your reply.
I know what you mean. The issue is not related to the number of channels.
The issue is with the level meters.
You might see the meters "detecting" some input signal @196 kHz where in reality no inputs are connected at all.
I hope it clarifies the issue a little bit.
Thanks
Same for me with USB3, there is surely an explanation for that. Lets wait for RMEs answer.
Manual chapter 39.7, Noise level in DS / QS Mode.
Activating 'RMS' on the right side also helps to get a bit lower numbers in TotalMix FX.
i have the same behavior in USB and Thunderbolt.
Sure, because it is perfectly normal.
For others who see this post, quoting the manual:
39.7 Noise level in DS / QS Mode
The outstanding signal to noise ratio of the Fireface UFX+ AD-converters can be verified even
without expensive test equipment, by using record level meters of various software. But when
activating the DS and QS mode, the displayed noise level will rise from -113 dB to -105 dB at 96
kHz, and –79 dB at 192 kHz. This is not a failure. The software measures the noise of the whole
frequency range, at 96 kHz from 0 Hz to 48 kHz (RMS unweighted), at 192 kHz from 0 Hz to 96
kHz.When limiting the measurement range from 20 Hz to 20 kHz (so called audio bandpass) the
value would be -113 dB again. This can be verified with RME's DIGICheck. The function Bit
Statistic & Noise measures the noise floor by Limited Bandwidth, ignoring DC and ultrasound.The reason for this behaviour is the noise shaping technology of the analog to digital converters.
They move all noise and distortion to the in-audible higher frequency range, above 24 kHz.
That’s how they achieve their outstanding performance and sonic clarity. Therefore the noise is
slightly increased in the ultrasound area. High-frequent noise has a high energy. Add the doubled
(quadrupled) bandwidth, and a wideband measurement will show a significant drop in
SNR, while the human ear will notice absolutely no change in the audible noise floor.
I believe that everybody understood now 
RME User Forum → MADI/AES Premium Line → Win10 UFX+ Thnderbolt 192kHz issues
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