Why are all my speakers showing distortion at 2 of the same points?

[No_hair_left]

I bought a second hand avr with dirac art and when messing around in rew I noticed that all of my speakers or the avr is showing high distortion at the exact same 2 points (214hz and 428hz), is this something to worry about? given there is no warranty I'm hoping its all good but I checked my old measurements with the same speakers and those distortion lines were not even there.

 

[NTK]

Are you looking at the noise floor curve instead? It looks to me the highest curves beside the fundamental in your plots are noise floor.

 

[No_hair_left]

Are you looking at the noise floor curve instead? It looks to me the highest curves beside the fundamental in your plots are noise floor.

Hi yes the noise floor, does that mean the mic is the problem? or is this even a problem? it shows in the spectrogram so I thought it was a amp problem.

 

[TurtlePaul]

Hi yes the noise floor, does that mean the mic is the problem? or is this even a problem? it shows in the spectrogram so I thought it was a amp problem.

No, that typically means that something in your room is making a quiet but measurable noise at that frequency.

 

[NTK]

If it is noise floor then probably those 200+ Hz and 400+ Hz sound is from your environment, such as machinery noise, transformer hum, etc.

You can test you mic by going some place far away (miles) from where you are, and record some sound and see if the same frequency spikes are still there.