REW YouTube Tutorial - Page 4 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #31 of 105 Old 10-26-13, 03:50 AM
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Re: REW YouTube Tutorial

Holy Moly, there is a lot that goes into acoustics. Thank you for the video, going to try this out for my car audio.
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post #32 of 105 Old 12-26-13, 10:29 AM
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Re: REW YouTube Tutorial

I have a UMIK-1 and MBP. I was wondering how and if one needs to you perform the sound card calibration and level setting procedure as depicted in the video.
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post #33 of 105 Old 12-26-13, 10:51 AM
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Re: REW YouTube Tutorial

Yes to both. Especially the level setting.

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post #34 of 105 Old 12-26-13, 04:41 PM
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Re: REW YouTube Tutorial

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Yes to both. Especially the level setting.
So how do I achieve the equivalent of calibrating ones sound card. In the MBP+ UMIK1 it's using the MBP sound card. Do I just plug a line in to line out cable on the MBP and then run the calibration?
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post #35 of 105 Old 12-26-13, 04:49 PM
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Re: REW YouTube Tutorial

I'm not a studio guy so I'm not familiar with that equipment - sorry. Basically you need to let the system measure whatever equipment will be used to record and generate the sound by creating a loopback for the calibration.

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post #36 of 105 Old 12-27-13, 03:46 PM
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Re: REW YouTube Tutorial

Quote:
stereo247 wrote: View Post
I have a UMIK-1 and MBP. I was wondering how and if one needs to you perform the sound card calibration and level setting procedure as depicted in the video.
In REW 5.01 beta page 30, it says:
Calibrating the Soundcard
This step is not required when using a USB microphone as the input, skip directly to
Check levels
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post #37 of 105 Old 12-27-13, 03:49 PM
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Re: REW YouTube Tutorial

In fact, with a USB microphone, it is a lot simpler
quote from REW 5.01 beta page 28:
The initial steps required to make room measurements are:
1. Choose the audio input and output
2. Calibrate the soundcard (not required when using a USB microphone)
3. Check levels
4. Calibrate the SPL reading (not required when using a USB microphone that has
REW-compatible sensitivity cal data)
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post #38 of 105 Old 12-27-13, 04:13 PM
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Re: REW YouTube Tutorial

My mistake. Don't understand WHY one would still not be concerned about the frequency response of the sound card though.

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post #39 of 105 Old 12-27-13, 04:31 PM
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Re: REW YouTube Tutorial

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My mistake. Don't understand WHY one would still not be concerned about the frequency response of the sound card though.
You are right about that, I do not think that it would be flat down to 10 Hz, sound card has probably a high pass filter on the low range (DC- protection) and a low pass filter at the high end for anti-aliasing
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post #40 of 105 Old 12-27-13, 04:38 PM
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Re: REW YouTube Tutorial

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informel wrote: View Post
You are right about that, I do not think that it would be flat down to 10 Hz, sound card has probably a high pass filter on the low range (DC- protection) and a low pass filter at the high end for anti-aliasing
I just had a second thought, the output is not completely flat across the range, but the input reading is not ruler flat either, so if you calibrate it, you will still introduce an error because with a USB mic, you do not use the input of the sound card.

If there was a cal file for the sound card input, then it would be perfect
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