Calibration of Tascam US122mkII

[Horacio Lewinski]

I realize there is another thread asking about the same card, but I'm experiencing a different problem so didn't want to pollute the other thread.

I'm attempting to generate a calibration file for the Tascam. I connected a cable from RCA line out to the 1/4" line in (my EMM-6 mic connects thru XLR, but don't have such spare connector to assemble the cable to RCA now). I believe the upper range of the response I'm getting is not good - looks like noise to me, or feedback. Attached the response, and also a screenshot of the calibration setup screen, and a picture of the Tascam settings. I think I have all settings such that there's no feedback, but can't figure it out.

Feedback, ideas?

Thanks!

 

[Horacio Lewinski]

FWIW, here's with 1/48 smoothing. Looks as I would have expected, but I was also not expecting to need to smooth a calibration file.

 

[Wayne A. Pflughaupt]

Tough call. Maybe John will weigh in.

In the meantime, I assume you made sure the signal wasn’t overloading? Did you try it with the switch set to Mono?

When it get right down to it, the frequency response is fine. You don’t need a calibration file unless you need a timing reference.

Regards,
Wayne

 

[DanDan]

+1 You do not need a Calbration File with a normal interface in working condition. There is obviously something wrong here. Try running REW on your computers own soundcard.

 

[John Mulcahy]

Is the card set to run at 48 kHz in the Windows audio properties for its input and output? If not the OS will be resampling between the REW rate and the rate the card is set to run at. Could try ASIO drivers instead, with those the driver will properly configure the sample rate.

 

[Horacio Lewinski]

Is the card set to run at 48 kHz in the Windows audio properties for its input and output? If not the OS will be resampling between the REW rate and the rate the card is set to run at. Could try ASIO drivers instead, with those the driver will properly configure the sample rate.

Of course you nailed it!! I had not set up on Windows Control Panel the device to be at 48kHz by default. And thank you for clarifying "input and output", because I switched the output and couldn't get REW to work until I figured I had to also set input at 48kHz. Thank you so much!!

How does this look? It's kind of what I was expecting. The smoothed 1/48 dropped before 20kHz and didn't look good.

BTW, I will turn to ASIO going forward. Will follow Kimmo Saunisto guide to measure drivers/speakers to use VituixCAD.

 

[John Mulcahy]

That looks correct.