feed back when using audio measurement software - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 5 Old 02-14-2020, 06:38 PM - Thread Starter
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Arrow feed back when using audio measurement software

I've downloaded REW and AudMeS audio measurement software and am trying them out using a Lenovo ThinkPad with individual ports for microphone and headphones, running Windows 7.


I've connected a shotgun microphone to the microphone input and connected the headphones output to the aux input of my stereo. I've placed the microphone right up to the driver of one of the speakers and run the test software. I assume the test software generates test tones via the headphones output, amplified by the amp and output through the speaker to be tested, and the microphone measures the signal in a graph.


It works, but somewhere in the setup the signal from the microphone is also fed back to the amplifier and causes feedback. Where is this likely to happen? In Windows? In the laptop? In the microphone input plug (3.5mm, 2-way mono plug)?


I've tried to disable the microphones and or headphones in the Sound option of the Windows control panel, but then the measuring software can't find them.


What's the trick?


Regards,


Rouke
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post #2 of 5 Old 02-14-2020, 09:17 PM
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In the Windows sound settings on the recording devices tab go into the properties for each device and make sure 'Listen to this device' is unchecked.
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post #3 of 5 Old 02-15-2020, 02:25 AM - Thread Starter
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Wow! Thanks mtg90. That was an easy fix.


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post #4 of 5 Old 02-15-2020, 09:15 AM
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Just know that using a random uncalibrated mic, will give you random uncalibrated results.

There won't be a known SPL reference-point, or known reference-FR.
Measurement mics like the UMIK-1 are very predictable because the soundcard is inside the mic itself, and is both SPL and FR calibrated.
The CSL UMIK-1 is calibrated to even higher standards, and isn't too much more money... (you probably spend more on coffee and gasoline everyday.)
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post #5 of 5 Old Today, 01:17 AM - Thread Starter
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Wink

I'm a DIY. It can't be helped. Money is not the issue here. It's about satisfaction. However, I don't drink coffee and spend about NZ$80 per week on petrol (ie. US$7.35 per day). So yeah, if you could tell me where I can get a CSL UMIK-1 for less than US$7.35, I won't resist!


I look forward to your advice ;-)


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audmes , microphone , rew , speaker , windows 7

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