Member
Joined 2003
My new Motu M2 arrived yesterday. Doing the simple loop-back performance...
A pretty substantial improvement over the Behringer UMC202HD in terms of noise and distortion... As I said a few posts back, the Behringer is perfectly serviceable for collecting data for use in crossover design. But I wanted something with lower noise and distortion, and that is definitely what I got. Noise is consistently -120 dB, and THD is consistently less than 0.01%
A pretty substantial improvement over the Behringer UMC202HD in terms of noise and distortion... As I said a few posts back, the Behringer is perfectly serviceable for collecting data for use in crossover design. But I wanted something with lower noise and distortion, and that is definitely what I got. Noise is consistently -120 dB, and THD is consistently less than 0.01%
I'm not sure what you mean. I used the left/right loop-back setup as shown in the ARTA manual Figure 1.9
I've ordered one of those clone IEC 711 couplers from Aliexpress to play around with and measure my IEMs.
Many IEMs are multi-way but the individual drivers (DD, BA, EST, BC, planars, piezo) can't be disconnected and measured individually obviously.
Is there some measurement technique using ARTA that could be used to determine the crossover frequencies between the drivers?
Many IEMs are multi-way but the individual drivers (DD, BA, EST, BC, planars, piezo) can't be disconnected and measured individually obviously.
Is there some measurement technique using ARTA that could be used to determine the crossover frequencies between the drivers?
are you using ASIO with your MOTU M2?
i just ordered one to replace an OLD sound blaster that I've had enough of ...
I don't think so... it came with drivers, but they might be some version of ASIO, I am not sure... I must confess that I am barely literate when it comes to PC-based audio. I mostly copy what other people have done. When @HeadShake was in my town, I would ask him this kind of question...
Member
Joined 2003
ASIO always, except for use with APO EQ. In ARTA, the device that isn't labelled "WDM" is the asio driver.
Just to close the loop on this, here is my "audio device setup"...
When I installed the Motu driver and plugged in the Motu M2, this setup menu gave me three options
So this is why I was not able to say that I was using ASIO drivers... I am glad that folks like DcibeL can advice us on what to do and what it means...
When I installed the Motu driver and plugged in the Motu M2, this setup menu gave me three options
So this is why I was not able to say that I was using ASIO drivers... I am glad that folks like DcibeL can advice us on what to do and what it means...
Member
Joined 2003
You chose correctly 🙂. Main benefit for ARTA is that you can change sample rate Willy nilly within the software without having to worry about Windows settings.
I measured recently with ARTA, a DSP based speaker. I noticed the following:
In the first measurement of the Impulse response, the polarity was positive.
In the next measurement, with no change in the setup, the polarity was inverted and became negative.
Out of 15 succesive measurements that I took, 7 of them were positive and the rest were negative.
Is it possible this to be a problem of ARTA ?
Does anyone else noticed the same issue ?
In the first measurement of the Impulse response, the polarity was positive.
In the next measurement, with no change in the setup, the polarity was inverted and became negative.
Out of 15 succesive measurements that I took, 7 of them were positive and the rest were negative.
Is it possible this to be a problem of ARTA ?
Does anyone else noticed the same issue ?
Member
Joined 2003
Easy to determine yourself, measure other normal speaker without DSP in the loop.
Polarity is 100% correct in all measurements made with ARTA, it would be a very detrimental error if that were not the case.
Polarity is 100% correct in all measurements made with ARTA, it would be a very detrimental error if that were not the case.
Yes, I did that, I measured a single driver without any DSP processing, the polarity was always the same.
But I wanted to know if someone else noted the above, to be sure that this is not an ARTA issue.
But I wanted to know if someone else noted the above, to be sure that this is not an ARTA issue.
when you send the test signal to the speaker, are you sending an analog signal or a digital signal? I have never noticed the phenomenon you describe, but my active speakers always use an analog signal as input.
If you are sending a digital signal to the speakers, is it a USB input, or a SPDIF, or something else ??
If you are sending a digital signal to the speakers, is it a USB input, or a SPDIF, or something else ??
I see ARTA 1.9.7 has been released.
Changelog: https://artalabs.hr/news.htm
Download: https://artalabs.hr/download.htm
Thank you for reacting to and fixing one of my earlier bug reports, number of overlay lines within the "Copy" & "Add filename" feature in ARTA.
Still broken: "Add filename" in the graphical export in STEPS's "Loudspeaker distortion limited SPL" tab is still without function.
Would it also be possible to introduce the same pre-delay for soundcard sample rate changes that you just implemented in ARTA into STEPS? That would be a big help, for example to try to fix this problem -> Post #1377
Changelog: https://artalabs.hr/news.htm
Download: https://artalabs.hr/download.htm
Thank you for reacting to and fixing one of my earlier bug reports, number of overlay lines within the "Copy" & "Add filename" feature in ARTA.
Still broken: "Add filename" in the graphical export in STEPS's "Loudspeaker distortion limited SPL" tab is still without function.
Would it also be possible to introduce the same pre-delay for soundcard sample rate changes that you just implemented in ARTA into STEPS? That would be a big help, for example to try to fix this problem -> Post #1377
I put ARTA version 1.9.7 on Web site. I've postponed release information to users , as I wait that Microsoft remove download protection.
It usually requires 3-5 days.
This version is not bug clearance version. I have just added most wanted ARTA features.
I will monitor user response to remove possible bugs.
Ivo
It usually requires 3-5 days.
This version is not bug clearance version. I have just added most wanted ARTA features.
I will monitor user response to remove possible bugs.
Ivo
Member
Joined 2003
Please consider for future development of ARTA:
-include option for left window
-include option to display phase of overlay traces
-sine sweep in LIMP, for faster results vs slow stepped sine.
-frequency range limits for since sweep in ARTA, for easier distortion analysis of tweeters without additional protection or slow stepped sine.
-distortion analysis - please allow display of relative harmonic level in dBr instead of %.
-distortion analysis in ARTA - please add display of H5.
-option to retain zoom,gain,offset settings when new measurement is completed.
-include option for left window
-include option to display phase of overlay traces
-sine sweep in LIMP, for faster results vs slow stepped sine.
-frequency range limits for since sweep in ARTA, for easier distortion analysis of tweeters without additional protection or slow stepped sine.
-distortion analysis - please allow display of relative harmonic level in dBr instead of %.
-distortion analysis in ARTA - please add display of H5.
-option to retain zoom,gain,offset settings when new measurement is completed.