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rsmrecords · 15th December 2009

Hi,

I'm looking for information on the accuracy of FFT frequency spectra for low end information. ie. below 100 hz.

In my system, using VST analysers like Nugen's Visualizer, or Bias Reveal, I consistently see low end out put that I don't think is actually there. My monitors extend down to 30 hz at least, and there are high pass filters on most recorded tracks. So it seems that there should only rarely be any energy in the 20-60hz range.

I have read that the accuracy of FFT is tied to the sample rate and FFT window size. Maybe this is an issue with typical 44.1 and 88.2 working session rates?

Any comments would be appreciated.

thanks

r

15th December 2009	#1
rsmrecords Gear interested Join Date: May 2009 Posts: 2 Thread Starter	low freq FFT accuracy? Hi, I'm looking for information on the accuracy of FFT frequency spectra for low end information. ie. below 100 hz. In my system, using VST analysers like Nugen's Visualizer, or Bias Reveal, I consistently see low end out put that I don't think is actually there. My monitors extend down to 30 hz at least, and there are high pass filters on most recorded tracks. So it seems that there should only rarely be any energy in the 20-60hz range. I have read that the accuracy of FFT is tied to the sample rate and FFT window size. Maybe this is an issue with typical 44.1 and 88.2 working session rates? Any comments would be appreciated. thanks r