REW with EMM6 and Mytek DSD/DAC

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Tom B.

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Jul 10, 2011

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• Jul 7, 2014

• #1

How does one set up REW when using an outboard USB mic (Dayton EMM6) and an outboard DAC (Mytek 192 DSD mastering version), in terms of the soundcard 'loopback' calibration? Normal practice is to connect soundcard output straight back into the input, but I can't find a discussion that expands on the use of an external DAC.

Connection chain is USB mic ---> Lenovo Laptop ---> Mytek DAC


Tom B.

 

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mojave

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Oct 29, 2010

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• Jul 7, 2014

• #2

There is no difference to using an external DAC vs internal sound card. You still loop from the output to the input. However, this doesn't really provide accurate results since the input is usually rolled off on the bottom end and there is an impedance mismatch between the input and output. You really just want the output frequency response. Any modern DAC is completely flat from 20k-20kHz which exceeds the capabilities of the EMM6 anyways. You really don't need a loopback calibration loaded - especially with the Mytek 192.

 

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Tom B.

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• Jul 8, 2014

• #3

The mastering version of the Mytek 192 omits line inputs in favor of SDIF DSD inputs, which negates the possibility of loopback; I hadn't thought that far. Difficulties setting up the new laptop prevented me from taking any measurements last night, but perhaps tonight we'll get a but further.

Thank you for the helpful reply.

Tom

 

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Wayne A. Pflughaupt

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Oct 15, 2012

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• Jul 8, 2014

• #4

Tom B. said:

Connection chain is USB mic ---> Lenovo Laptop ---> Mytek DAC

Click to expand...

Did you mean UMM6? Because the EMM6 isn’t USB.

Regards,
Wayne A. Pflughaupt

 

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Tom B.

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Jul 10, 2011

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• Jul 8, 2014

• #5

Wayne-

Yup, good catch. It is a UMM-6.

Tom

 

microstrip

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May 30, 2010

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• Jul 8, 2014

• #6

Tom B. said:

Wayne-

Yup, good catch. It is a UMM-6.

Tom

Click to expand...

Did you download the individual calibration file from the microphone manufacturer site? As far as I remember it is the only calibration needed when using the UMM-6 with REW.

 

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Tom B.

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Jul 10, 2011

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• Jul 8, 2014

• #7

microstrip said:

Did you download the individual calibration file from the microphone manufacturer site? As far as I remember it is the only calibration needed when using the UMM-6 with REW.

Click to expand...

Yes, I downloaded the file after purchasing the mic. Hooked it up tonight and managed to take a bunch of measurements, although I suspect none of that was done entirely correctly. Practice will improve...either that or I'll have to consult with one of the forum REW gurus.

Playing with my sub controls, I was able to make small adjustments and see the changes reflected on each measurement, and actually managed to improve the curve a bit.

Quite the useful tool...

Tom