Once and done. I didn't really get what happened.For cycling the knob to get the 10dB lower noise (I presume you mean the big monitor knob?) does this have to be done on every power cycle or was it a once and done job? Seems a bit weird if it needs to be done every time but I don't know much about this stuff clearly!
Once and done. I didn't really get what happened.
Another thing to mention is that I finalized the measurements with the ASIO4All driver, the MOTU driver having a tendency to trash my 32 averages just before they finish... Before somebody asks, buffer was at the same size for both.
YesHi,
Do you use the 24 bits drivers ? and a generator in 24 bits dither ? ( not 16 bits? ...)
View attachment 62703
RightHope that this is useful.
Things that I found on my MOTU M-2:
- AD AKM AK5552VN
- DA ESS ES9018S
- OpAmp TI 88 1AW7 (didn't find anything on Google)
- Microcontroller processor XMOS U11680C20
Started enjoying this forum today, so literally a noob here.
When you measure with the loopback you mean the TRS output - TRS input via TRS cable?
Because in this case if the DA conversion is better than AD you are limited by this one, which is recording.
Wrong?
@ofrappier Your graph means that they are good?
just see results
There would be some ripples in loopback mode as it uses an AKM ADC:What that last spectrum shows is that all noise and distortion products are below 110dB and therefore completely inconsequential. A very fine result. It doesn't show frequency response, but assuming that's OK, and there's no reason to suppose it isn't, then completely satisfactory in every respect.
S
There would be some ripples in loopback mode as it uses an AKM ADC:
https://prosound.ixbt.com/interfaces/motu/m4/2444.shtml
RME ADI-2 series also use AKM ADC, but the ripples are reduced by the FPGA anti-ripple filter:
https://www.forum.rme-audio.de/viewtopic.php?pid=132179#p132179
However, even without the FPGA filter, if ADC is operated at a higher rate, then the ripples would be reduced as well.
https://velvetsound.akm.com/content.../audio-adc/ak5554vn/ak5554vn-en-datasheet.pdf
TI and Cirrus for example have ADCs with lower ripples in 44/48k, at least invisible in RMAA's default zoom scale.
It matters when you use the ADC for measurements. Many DACs have a flatter passband response than these AKM ADCs.But does it matter in reality?