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post #1 of 14 Old 03-15-14, 11:52 PM Thread Starter
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UMIK-1 Mic Measurement Help

For some reasons I cannot get UMIK-1 mic to measure above 800hz today. I've taken many measurements of my full-range speakers. I made sure I set the lower and upper limits prior to starting the tests.

Please let me know what I might be doing wrong here. Thank you.
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UMIK-1 Mic Measurement Help-full-range-measurement.png  

Attached Files Mar 15 17_00_35 4-way LR 350hz xover.mdat (495.2 KB) 
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post #2 of 14 Old 03-16-14, 03:11 AM
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Re: UMIK-1 Mic Measurement Help

Hi there, what other devices are in the chain? It looks like you have a crossover filter set at ~180 Hz.

Your impulse also looks a bit unusual... Just wondering if you've checked it in the earlier good measurements?

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post #3 of 14 Old 03-16-14, 04:38 AM Thread Starter
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Re: UMIK-1 Mic Measurement Help

Thanks Hifizine.

I have 4-way speakers and running them in bi-amp mode just started today. For LF drivers, I have Ashly XR-2001 between preamp and mono amp and I set the xover freq at ~350Hz on the Ashly. Not sure why you think the filter is set at ~180Hz. Any suggestions on how I can verify if it's at 180Hz or 350Hz?

Thanks.
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post #4 of 14 Old 03-16-14, 08:02 AM
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Re: UMIK-1 Mic Measurement Help

Quote:
PC620 wrote: View Post
For some reasons I cannot get UMIK-1 mic to measure above 800hz today. I've taken many measurements of my full-range speakers. I made sure I set the lower and upper limits prior to starting the tests.

Please let me know what I might be doing wrong here. Thank you.
The info on your measurement shows the sweep was set as 20 - 795 Hz for this measurement.

When you open the "measure" dialog box for your next measurement make sure the range is set as you desire.
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post #5 of 14 Old 03-16-14, 11:33 AM Thread Starter
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Re: UMIK-1 Mic Measurement Help

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jtalden wrote: View Post
The info on your measurement shows the sweep was set as 20 - 795 Hz for this measurement.

When you open the "measure" dialog box for your next measurement make sure the range is set as you desire.
I got the mic set up for quick check this morning, and you were right that the upper limit was set at 800Hz by default. For this particular case, REW's lower and upper limits are 20Hz to 24KHz and I had been entering values above 24KHz during my tests yesterday.

Here's what I noticed (on my Win 7 64bit laptop) this morning, REW will not accept any values above 24KHz. I am not sure why that is.

Does anyone know or can explain this?

Thank you.
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post #6 of 14 Old 03-16-14, 01:30 PM
 
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Re: UMIK-1 Mic Measurement Help


It’s because that’s the limitation written into the program. It will go all the way down to 0 Hz on the low end, though – not sure what you were seeing that limited at 20 Hz.

Regards,
Wayne




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post #7 of 14 Old 03-16-14, 02:24 PM Thread Starter
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Re: UMIK-1 Mic Measurement Help

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Wayne A. Pflughaupt wrote: View Post

It’s because that’s the limitation written into the program. It will go all the way down to 0 Hz on the low end, though – not sure what you were seeing that limited at 20 Hz.

Regards,
Wayne

Thanks Wayne. As for the lower end, I didn't try to change to lower than 20 Hz but you are correct of course that it will go down to 0 Hz (just confirmed now).

Anyway I can confirm what my actual x-over is at now? I set the dial on Ashly to ~350 Hz but the last reply I got here was that it looks like it was set at ~180 Hz from the graph and data provided
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post #8 of 14 Old 03-16-14, 03:31 PM
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Re: UMIK-1 Mic Measurement Help

The max freq we can set half the sample freq.
So if our sample freq is 48k then 24k is the max freq that can be measured. Google "Nyquist frequency" for an explanation.
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post #9 of 14 Old 03-16-14, 05:51 PM Thread Starter
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Re: UMIK-1 Mic Measurement Help

Here's my latest room measurements with response range from 10 - 24 KHz. These are stereo setup and actively biamping the LF drivers. UMIK-1 mic with calibrated file from CS using narrow band @0 degree.

I am still playing with the adjustments on the Ashly so don't really know what I am doing yet. Setting xover at ~350 Hz right now.

Any input is much appreciated.
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post #10 of 14 Old 03-16-14, 06:53 PM
 
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Re: UMIK-1 Mic Measurement Help


That’s a curious crossover frequency. What are you dividing frequencies between?

Regards,
Wayne




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