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.
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.
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.
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.
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.
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?
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
Which generation of 2i4 do you have? Beacuse for 2nd generation in specification input impedance is 52kOhms
Yes, I have a gen 2. I spent a fair bit of time to actually measure the input impedance and it was about 13.4k when measuring a 1k sign wave.
Has anyone tested the bandwidth of the MOTU M4 with it running at 192kHz sample rates? the -3dB @45kHz (while running at 96k) is good to see (they don't have a brick wall at 20k), but if it has response up to 90kHz then I'm especially excited.
Traded up from M2 to the M4, its very sweet (BH Photo).
Nice line out/in and the motu driver is perfect. I looking at new software as my old RTA is now defunct and no longer supported.
On w10 testing now the Visual Analyzer from Italy.
So far looking good. M4 basic thd 0.0004 and thd+n 0.0009
Visual Analyser details
Nice line out/in and the motu driver is perfect. I looking at new software as my old RTA is now defunct and no longer supported.
On w10 testing now the Visual Analyzer from Italy.
So far looking good. M4 basic thd 0.0004 and thd+n 0.0009
Visual Analyser details
Attachments
Spectrum plot may benefit from averaging. Not sure if you lock the generator signal to the FFT sampling rate.