Is my sound card to bad to use with REW? - Home Theater Forum and Systems - HomeTheaterShack.com

 
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post #1 of 8 Old 12-05-14, 04:22 PM Thread Starter
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Is my sound card to bad to use with REW?

This is the image of my soundcard. Is it ok or should I get an external one?
Thank you.
http://s1224.photobucket.com/user/ca...tml?sort=3&o=0
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post #2 of 8 Old 12-05-14, 07:29 PM
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Re: Is my sound card to bad to use with REW?

Can’t say I’ve ever seen a sound card calibration that looks like that. Do you have the monitoring function turned off, or set for “Computer?”

If that is a legitimate measurement, then yes you’ll need an outboard soundcard, or a calibrated USB mic.

Regards,
Wayne



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post #3 of 8 Old 12-06-14, 03:16 AM Thread Starter
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Re: Is my sound card to bad to use with REW?

It could easily be that I do not do it right.

If you by monitoring function means the laptop microphone, then it is turned off.

My laptop does only have a combined 4 pole 3.5 mm jack for headphones, and not two separate jacks.

I did have problems with connecting it directly, so i had to mount a 1 kohm resister between speaker out and microphone in, at the jack. I don't know if this is going to alter the measurements.

You write "then you’ll need an outboard soundcard, OR a calibrated USB mic" but shouldn't I calibrate my sound card and then use a calibrated microphone for room corrections?

Last edited by tjtronic; 12-06-14 at 03:38 AM.
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post #4 of 8 Old 12-06-14, 09:13 AM
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Re: Is my sound card to bad to use with REW?

With a USB mic, no sound card is needed. Poke around for UMIK-1 threads here.

Regards,
Wayne



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post #5 of 8 Old 12-06-14, 09:41 AM Thread Starter
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Re: Is my sound card to bad to use with REW?

I do have a UMIK-1...
But isn't the sound cart supposed to make the sweep and therefore it has to be calibrated.
Or what do I miss here...
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post #6 of 8 Old 12-06-14, 10:35 AM
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Re: Is my sound card to bad to use with REW?

When you use a UMIK-1 the soundcard is just generating the test signal. Soundcard outputs are generally very flat, roll off is more commonly on the inputs, which you don't use with a USB mic, so soundcard calibration isn't needed or appropriate.
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post #7 of 8 Old 12-06-14, 10:50 AM Thread Starter
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Re: Is my sound card to bad to use with REW?

Ok...

I didn't know that it was to calibrate the input only. Thought that it calibrated the output also.

I think I'm good to go further in the process now.

Thank you.
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post #8 of 8 Old 12-06-14, 11:19 AM
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Re: Is my sound card to bad to use with REW?

Loopback calibration calibrates input and output together, there's no way to separate which contributes to the measured result.
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