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Nebula harmonics vs drive/input

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Nebula harmonics vs drive/input

Postby EricH » Sun Dec 25, 2011 2:40 pm

I play 1khz sine wave and loaded various programs using input level drive and actual drive control.I can see very little harmonic addition to the spectrum analysis.In fact only something looking like DC offset very very low and some second harmonic when all controls pushed to maximum.Why is this so ? And where are the analog enrichment coming from thanks.
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Re: Nebula harmonics vs drive/input

Postby mathias » Sun Dec 25, 2011 10:55 pm

please provide more details on your measurement.
what level has your 1 khz sinus, what programs did you use to test, what do you use for measuring (and with what settings)?

in my measurements with preamp-programs i get amounts between -110 to -40 db for the harmonics with different programs and settings (input, drive). if you want to test your programs with more real settings audiolevelwise set your sinus to something inbetween -20 to -10 db. a sinus of 0 db will cause wrong/bad behaviour with programs that are adjusted for levels around -18 db for example.

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Re: Nebula harmonics vs drive/input

Postby EricH » Mon Dec 26, 2011 1:49 pm

Howdy I took it between -18 and -2dB digital(with level in and drive maxed out) very little harmonic display on voxengo span. I tried a tube compressor libraries and also some tape ones and very little was seen.Surely these should show odd/even order harmonics.
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Re: Nebula harmonics vs drive/input

Postby EricH » Mon Dec 26, 2011 6:38 pm

Again I tried various 3rd party libraries.I can only see 2nd harmonic at 2khz with the vast majority of the mic preamps, tube compressor, tube eq's I try and that is with drive at max. Sine at -9db digital second harmonic at -72db digital. That is miniscule harmonic contribution. Lets say I put freeware tube amp from voxengo, drive it a bit and a full compliment of harmonics appear, try tape saturation and a different dispersion of harmonics appear.Example.... VM comp, discrete vari mu compressor, with tubes and transformers in drive it with decent level and you get a very small amount of second harmonic.Why does Nebula harmonic output seem very very low and not related to the equipment that is sampled when "driven". Is Nebula capable of sampling the harmonics of tube equipment and reproducing them with any degree of accuracy?Thank you for replies.

Anyone can easily test this themselves, play as sine and drive it with a analysis after neb.I tried 6 different programs from different developers, eq, comps and pre's and second appears (2khz) and virtually no other harmonics I saw some 3rd at -100dB
also crazy sub harmonics 10hz appear for some programs.
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Re: Nebula harmonics vs drive/input

Postby faun2500 » Mon Dec 26, 2011 8:05 pm

Interesting.
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Re: Nebula harmonics vs drive/input

Postby EricH » Mon Dec 26, 2011 8:29 pm

I am also surprised at the very low harmonic generated.
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Re: Nebula harmonics vs drive/input

Postby RJHollins » Mon Dec 26, 2011 8:35 pm

The is a small, FREE app [PC] call:

VST Analyzer

It can show important details that SPAN was not designed for.
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Re: Nebula harmonics vs drive/input

Postby EricH » Mon Dec 26, 2011 10:39 pm

But I am interested in harmonics generation for which span is perfect. As is demonstrated by inserting any DSP tube or tape saturation software.A search for "VST Analyzer" is inconclusive, a link would be appreciated thanks.
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Re: Nebula harmonics vs drive/input

Postby mathias » Mon Dec 26, 2011 10:52 pm

system 1: windows 8 32 bit - samplitude prox, tracktion6, reaper
system 2: mac osx yosemite - reaper(32+64bit), tracktion6(32+64bit)

both systems on: macbook pro (late 2009), core 2 duo 3,06 ghz, 4 gb ram, graphic: nvidia geforce 9600M GT 512 MB
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Re: Nebula harmonics vs drive/input

Postby EricH » Mon Dec 26, 2011 10:57 pm

superb thanks
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