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USB Audio interface for measurement
USB Audio interface for measurement
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Old 15th December 2019, 06:57 AM   #61
jfetter is offline jfetter  Costa Rica
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USB Audio interface for measurement
Ok. Just saying there are practical limitations.
I travel a lot , have two locations for my hobby.
Have not owned a desktop for many years.
PCI just wont work for me.
The cheap mass market interfaces make sense.
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Old 15th December 2019, 07:31 AM   #62
H713 is offline H713  United States
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I agree that USB interfaces are my preference, but in my case this will probably end up stationary at a test bench.

One other PCIe option that looks interesting is the EVGA Nu Audio card. It uses the AK5572 ADC, which looks pretty enticing from a THD standpoint. Anyone played with this at all? Assuming they did their analog design well and didn't limit the bandwidth to 20kHz (and that's a big assumption), the AK5572 looks like it should be about the best ADC available for measurement usage.
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Old 15th December 2019, 08:48 AM   #63
phofman is offline phofman  Czech Republic
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EVGA Nu Audio is a USB card with onboard PCI-e USB controller.
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Old 15th December 2019, 05:19 PM   #64
H713 is offline H713  United States
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Quote:
Originally Posted by phofman View Post
EVGA Nu Audio is a USB card with onboard PCI-e USB controller.
Interesting, so I would expect the latency to be slightly worse. That's probably not a dealbreaker for me, but definitely could be for some people.

The marketing wank they're using is annoying, I really don't see why they need a 300 MHz bandwidth op-amp, but the specs I've seen look promising.
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Old 15th December 2019, 08:22 PM   #65
jcx is offline jcx  United States
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Default Motu M4

I bought this a week ago, listened to headphone out while binging

ran RMAA just now, TRS balanced line in/out 3' cables, win 10 Laptop
Quote:
RightMark Audio Analyzer test report
Testing device [ASIO] MOTU M Series
Sampling mode 24-bit, 96 kHz
Interface ASIO
Testing chain External loopback (line-out - line-in)
RMAA Version 6.4.5


20 Hz - 20 kHz filter ON
Normalize amplitude ON
Level change -2.5 dB / -2.5 dB
Mono mode OFF
Calibration singal, Hz 1000
Polarity correct/correct



Summary
Frequency response (from 40 Hz to 15 kHz), dB
+0.04, -0.03
Excellent

Noise level, dB (A)
-115.6
Excellent

Dynamic range, dB (A)
115.5
Excellent

THD, %
0.00034
Excellent

THD + Noise, dB (A)
-101.0
Excellent

IMD + Noise, %
0.00139
Excellent

Stereo crosstalk, dB
-110.9
Excellent

IMD at 10 kHz, %
0.00128
Excellent

General performance

Very good
Attached Images
File Type: png fr.png (4.0 KB, 460 views)
File Type: png thd.png (6.9 KB, 463 views)
File Type: png noise.png (6.6 KB, 463 views)
File Type: png dynamics.png (6.6 KB, 461 views)
File Type: png imd.png (8.3 KB, 397 views)
File Type: png cross.png (4.8 KB, 79 views)
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Old 15th December 2019, 08:32 PM   #66
jfetter is offline jfetter  Costa Rica
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USB Audio interface for measurement
Looks like motu claims are real.
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Old 16th December 2019, 04:26 AM   #67
H713 is offline H713  United States
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THD comes close to the Lynx. Very impressive, and it's nice to see some spec sheets that aren't regurgitated numbers from the Analog Devices or AKM datasheets. Anyone tested the measurement bandwidth yet?
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Old 16th December 2019, 01:03 PM   #68
DNi is offline DNi  Switzerland
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Quote:
Originally Posted by jcx View Post
I bought this a week ago, listened to headphone out while binging
ran RMAA just now, TRS balanced line in/out 3' cables, win 10 Laptop
Thank you very much for sharing the results.
The M4 seems to be the successor to the Audio Express model which I've been using for the past five years or so. Two years ago I exchanged all op-amps in it for a presumably better stock, and THD improved by 6-7dB.
Comparing now the M4 results with the Audio Express ones I obtained with the same S/W and under almost the same conditions (my signal cables are twice as long, and my interface to the laptop is FW400), I see that the principal difference is the much improved noise floor of the M4. This of course pulls all (xxx + N) results in the right direction (s. attachment).

Regards,
Braca
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Old 16th December 2019, 03:39 PM   #69
electron-ic is offline electron-ic
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Which is the ADC inside the Motu M line?
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Old 22nd December 2019, 10:35 AM   #70
mecedo is offline mecedo
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Quote:
Originally Posted by stuartmp View Post
One thing to note. The input impedance of the scarlett is about 13,437 ohms

Which generation of 2i4 do you have? Beacuse for 2nd generation in specification input impedance is 52kOhms
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