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odd noises show in waterfall, spectrogram

1325 Views 2 Replies 3 Participants Last post by  MPS
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. :scratch:

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 :eek:lddude: "puzzler.mdat":



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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.


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