REW 5.01 Beta - Soundcard Calibration Issue (dB variations) - Home Theater Forum and Systems - HomeTheaterShack.com
 
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post #1 of 5 Old 11-18-11, 03:06 PM Thread Starter
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Appelbom
 
Join Date: Nov 2011
Location: Oslo
Posts: 3
REW 5.01 Beta - Soundcard Calibration Issue (dB variations)

Hi,

I'm a new member and just bought gear to perform room acoustic measurements, however i seem to be stuck already in the soundcard calibration phase.

HW/SW involved:

Lenovo X201 Windows 7 Enterprise Laptop
Roland UA-55 QUAD-CAPTURE with driver & control panel version 1.0.1 (loop from output 2R to input 2R with 3 meter jack to XLR cable)
REW Version 5.01 Beta

Windows Sound Setting 1:
Name:  windows sound settings 1.jpg
Views: 1509
Size:  29.5 KB
Windows Sound Setting 2:
Name:  windows sound settings 2.jpg
Views: 1136
Size:  29.2 KB
Roland Settings 1:
REW 5.01 Beta - Soundcard Calibration Issue (dB variations)-quad-capture-driver-settings.jpg
Roland Settings 2:
REW 5.01 Beta - Soundcard Calibration Issue (dB variations)-quad-capture-control-panel.jpg
REW Soundcard Settings 1:
REW 5.01 Beta - Soundcard Calibration Issue (dB variations)-rew-soundcard-calibration-1.jpg
REW Soundcard Settings 2:
REW 5.01 Beta - Soundcard Calibration Issue (dB variations)-rew-soundcard-calibration-2.jpg
REW Soundcard Measurement:
REW 5.01 Beta - Soundcard Calibration Issue (dB variations)-rew-soundcard-calibration-measurement.jpg

I have made sure to deactivate the "Direct Monitor" button on the soundcard.

Surely the soundcard measurement is not good?? Am I doing something wrong or is my soundcard messed up?

Thanks in advance for any help or pointers!
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post #2 of 5 Old 11-19-11, 04:51 AM
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Join Date: Jan 2010
Location: GTA, Ontario
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Re: REW 5.01 Beta - Soundcard Calibration Issue (dB variations)

Hmmmm,

Thanks for the pictures / they do help .

Quote:
I have made sure to deactivate the "Direct Monitor" button on the soundcard.
Good, if it was active you would get signal feedback ( which would be another type of trace ) .

Quote:
Surely the soundcard measurement is not good??
It's not good . It's noisy ( those spikes ) and looks to roll-off in the low frequencies a bit before I would expect .

Quote:
Am I doing something wrong or is my soundcard messed up?
Your overall methodology ( according to your pics ) is correct .

Before blaming the soundcard, make sure ;

> Your computers WiFi is "off" .
> Power your soundcard from the USB buss / not any included supply .
> If you used the mic input / turn off the 48v phantom power .
> Or make your "loop-back" is from "line out to line in" ( ie ; not the mic input on the soundcard ) .


Quote:
Thanks in advance for any help or pointers!
Your welcome ! / I hope something mentioned helps


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post #3 of 5 Old 11-19-11, 05:24 AM Thread Starter
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Appelbom
 
Join Date: Nov 2011
Location: Oslo
Posts: 3
Re: REW 5.01 Beta - Soundcard Calibration Issue (dB variations)

Yay! i think that worked!!
Being a newbie I totally didn't think about the phantom power issue...

Here is the new measurement with soundcard phantom power off:
REW 5.01 Beta - Soundcard Calibration Issue (dB variations)-rew-soundcard-calibration-measurement-2.jpg

This is "approved" right??

So excited - thanks for the help Earl!
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post #4 of 5 Old 11-19-11, 05:58 AM
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Join Date: Jan 2010
Location: GTA, Ontario
Posts: 1,400
Re: REW 5.01 Beta - Soundcard Calibration Issue (dB variations)

That looks better / though the noise up in the HF area actually increased ( which is weird ) .

That calibration is usable , though I would try a better quality ( loop-back ) cable ( with better shielding ) to see if I could get the visible noise to settle down ( to what you see at around 1000 hz ) .

<>
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post #5 of 5 Old 11-19-11, 01:49 PM Thread Starter
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Appelbom
 
Join Date: Nov 2011
Location: Oslo
Posts: 3
Re: REW 5.01 Beta - Soundcard Calibration Issue (dB variations)

Many thanks Earl - I'll see if I can get a hold of a better cable (even though I just bought this one for this purpose... bought it from a Pro Musician store - 3 meter Jack to XLR "Referement Cables (made in Italy) # MCR5 HI.-Q. Microphone Cable 2X0,22 mm˛" - at retail 50 $. Murr....)

Once I get going I'm pretty sure I will post my measurement for further guiding!

Cheers,
Lars
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