odd noises show in waterfall, spectrogram - Home Theater Forum and Systems - HomeTheaterShack.com

 
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post #1 of 3 Old 05-12-14, 10:57 AM Thread Starter
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odd noises show in waterfall, spectrogram

Hi! First, let me say that I am a happy and experienced user of REW. I mostly use it with a MiniDSP 2x4 to room correct and provide EQ for Bose 901s, currently with a DIY subwoofer. I've come close to EQ-ing to my house curve (another concept I learnt here at HTS).

What is odd is the past few days' measurements often showed what seems to be a constant tone just above ambient noise, that shows up in waterfall and (my preferred) spectrogram. While not shown, even a sweep of just ambient noise. My current data set has "lines" for 80, 90 and 180 Hz. The 90 Hz has been the most frequent. I cannot figure out the cause, if any.

It is worth noting that my living room is open plan, but appears to have modes including at 45 Hz. Am I seeing some odd type of resonance? In any event, these don't seem to interfere with REW's job of making a good EQ measurement.

Here is a link to where you can download my mdat file, if so inclined, to see first hand what I speak of "puzzler.mdat":

http://bmmoser.myweb.usf.edu/shared/TEMP/
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post #2 of 3 Old 05-12-14, 12:53 PM
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Re: odd noises show in waterfall, spectrogram


REW won't download on my work computer so I can’t look at your .mdat, but steady-state noises are typically generated by external sources like refrigerators and air conditioners, etc. It could also be coming from outside the residence as well.

Regards,
Wayne





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post #3 of 3 Old 05-12-14, 01:51 PM
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Re: odd noises show in waterfall, spectrogram

Noise is already showing before your test signal so it appears to be background noise.
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