Ableton Forum

@x3000:

Indeed, your spectrum shows a declining slope of ~ 24 dB/octave. (-51, -74 between 5 k and 10 k). That's what I would expect. My spectrum gives me ~ 16 dB/octave both for the autofilter and the VCF of the Juno 6. That's at least acceptable.

Now, send the same input to the spectrum of EQ ...

The white noise that you can generate in Live produces a crooked curve in the spectrum analyze

Confirmed. If I use the noise~ object Max for Live I observer an increase of 4dB between 100 Hz and 20 kHz. Within the range of 600 Hz and 1200 Hz it is negligible. For Jun6V it drops above 10kHz.

@benmuetsch:

I suspect the cause of the difference is, that white noise is a large number of waves. Your result gives a 24 dB per octave slope for just one single sine wave. Obviously your approach is how the steepness of the filter is defined.

In practice the filter has to work on a many ...

@x3000:

My original test was running white noise through a 24 dB/octave filter. The behaviour doesn't differ much between LPF and HPF. I took my values from points within the spectrum of the EQ Eight.

BenMuetsch tetst is different. He uses sinus. That is a single wave. So you can measure it with ...

I don't use any Q settings of EQ Eight at all. I only use it as a display of the slope of the white noise.

Let's repeat your settings. I create sinus of 600 and 1200 by playing notes D with Analoge. I set the loudness to -12 dB in the mixer (similar in Youlean loudness meter by triggering true ...

Measured in dB, the slope is linear in EQ Eight. I can draw a line and determine the slope accurately enough. The deviation by a factor of 4 cannot be explained by inaccuracies. It's quite certainly a different scale.

The Live Autofilter and the filter of the Jun6V from Arturia deliver similar ...

I try to get an understanding of the loudness in Live. I know there is differences between dB in acoustics and dB in signal processing. In signal processing there are even differences between power and amplitude AI tells me.

I would expect large warning signs everywhere pointing out the differences ...