Topic: audacity spectrum plot

[weroflu]

trying to understand high and low pass filtering with audacity, see attached image from a solo recording.

am i doing something wrong here? why is there no information above 9k?
also what would be a good frequency for the high pass filter?

[runonce]

trying to understand high and low pass filtering with audacity, see attached image from a solo recording.

am i doing something wrong here? why is there no information above 9k?
also what would be a good frequency for the high pass filter?

Is that plot pre or post processing?

What are you trying to accomplish - high pass or low pass?

And, this looks like it might have been recorded with low levels?

Did you select a music section for this plot?

Not having much energy in the HF is not unusual...especially if the levels are low.

[weroflu]

 this one was normalized but other than that no processing. the original file as recorded 24/96 at fairly low levels.
not so concerned about levels as just getting the hang of using the spectrum tool for finding out where to filter.

i want to do both  high and low pass.

default 104 seconds of material was used.

ok just wanted to check to see if it was normal to have so little above 10k.

i pulled up some of my favorite solo albums from yesteryear and looked at their spectrum and some of them were very band limited at both ends, not that it made things sounds worse. i was just curious about how to get things cleaned up.

for this one i tried 40hz and 10k for filters and it still sounded good.

on one of the settings there was nothing from 10k to 35k and then a fair amount of material above 35k, sort of interesting.

[runonce]

I think it is normal.

Im always surprised how little activity there is above 10K.

40 is pretty low, you'll really start to hear it about 80.

10k seems a bit aggressive, but if it sounds ok - then it sounds ok.

[weroflu]

if you think 80 and >10k are better that's why i posted so i could learn something.

from the plot, it looks like there is zero going on after 8k, so why do you think 10 is aggressive?

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[runonce]

Well - thats only 104 seconds - not sure if thats representative of the whole recording.

Are you sure there is some music represented in that selection? Those levels looks really low.

And, unless you are trying remove some artifacts - I just dont see any reason to limit the high end so much.

And Im not saying 80 is better - just that 40 is pretty low - not every recording going to have a ton of energy there.

80 is where you might start to miss the bass a bit.

[runonce]

Try making another plot - and make sure you select some music, rather than use the default.