Problem with REW settings? - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 23 Old 01-21-13, 10:06 AM Thread Starter
Shackster
 
Join Date: Jan 2013
Location: Central Valley, CA
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Problem with REW settings?

Hey all. I am trying to get my subwoofer measured so I can properly integrate it into my system. However, it looks like I am having difficulties getting the measurements done correctly.

Is there a setting I cant see in how I am setting it up to measure?

This measurement was in the near field to help with avoid the room acoustics.

Thanks.
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Problem with REW settings?-fr-image.png  

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post #2 of 23 Old 01-21-13, 10:27 AM
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Re: Problem with REW settings?

Please "recalibrate" your soundcard & post a pic of it ( as seen immediately after you have gone through the process ) .

"First-Responders" need to know that you're able to execute this task ( & then see for ourselves that evidence ) .

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post #3 of 23 Old 01-21-13, 10:35 AM Thread Starter
Shackster
 
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Re: Problem with REW settings?

I used the UMIK-1 with a macbook.

From what I understood it has everything built into it.
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post #4 of 23 Old 01-21-13, 11:45 AM
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Re: Problem with REW settings?

I'll agree that, is a shocking looking response for a sub-woofer .




This "looks" like you actually got data mostly from your main speakers ( when they were set to "large" ) .

IOW, subs ( typically a woofer within an enclosure ) won't produce response traces that looks anything like that ( unless it's a woofer with no enclosure around it ).

OTOH, if your sub is a poorly performing OB setup,( with not enough level as balanced against your mains ) that could explain such a suspect looking graph .

Any chance , that's what has actually occurred here ?

ie; You're dealing with a Open Baffle Sub whose level is swamped out by your Mains ( &/or you've maybe shot the wrong speaker with your mic ) ?




Last edited by EarlK; 01-21-13 at 12:11 PM.
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post #5 of 23 Old 01-21-13, 12:25 PM Thread Starter
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Re: Problem with REW settings?

Ill check and see if it was the mains or the subwoofer.

I already checked the settings in the receiver and the mains are set to "small"

I came to the same conclusion earlier and made sure to check that and the sub is set to "SWFR"

I wonder what would happen if I plugged the computer into the rear audio inputs compared to the front. Could that be a problem?

P.s. I guess it is possible that it was the mains running when I did this test and I just though I had the sub running. I did some psychological trickery on myself.

Tonight I will unplug my mains when I perform the test and I am also going to plug the audio from my computer into the back of the receiver rather than into the front panel.

Last edited by madbrayniak; 01-21-13 at 12:38 PM.
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post #6 of 23 Old 01-21-13, 01:39 PM
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Wayne Myers
 
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Re: Problem with REW settings?

Quote:
madbrayniak wrote: View Post
...I did some psychological trickery on myself...
Something a lot of us accomplish from time to time, self included.
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post #7 of 23 Old 01-21-13, 03:28 PM
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Re: Problem with REW settings?

If you attach the mdat file it will be easier to see whether the measurement was valid.

Did REW detect the UMIK and ask if you wanted to use it?
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post #8 of 23 Old 01-21-13, 04:26 PM Thread Starter
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Re: Problem with REW settings?

When I plugged in the UMIK-1 i received no notification about using it. It just worked right away.

I will work on it tonight. I am also going to plug the computer directly into the sub as that was a suggestion a friend of mine recommended to take away as many variables as possible.

is there a version of OS X that is recommended? I am currently running 10.5.8 but I am going to be upgrading soon.
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post #9 of 23 Old 01-21-13, 04:31 PM
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Re: Problem with REW settings?

10.5.8 is all I currently have available to test with so not a bad choice

The latest REW V5.01 beta release (beta 13) runs under OS X and recognises the UMIK (sample rate in REW needs to be set to 48kHz).
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post #10 of 23 Old 01-22-13, 11:29 PM Thread Starter
Shackster
 
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Re: Problem with REW settings?

small update,

I just got the new beta

However, before I got the update I also plugged the umik-1 in and plugged my laptop straight into the subwoofer and got the same results....

I will try and get time to take more measurements tomorrow....

I am looking for another job currently so that is taking the majority of my time when I am not at work.
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