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Crossover Frequencies
https://forums.stereotool.com/viewtopic.php?t=5501		 Page 1 of 1
Author:  blacklightradio [ Fri Feb 21, 2014 11:47 am ]
Post subject:  Crossover Frequencies
I'm curious about the choice of crossover frequencies on the multiband compressor. Were there specific reasons those frequencies were chosen?

I ask because it's clear the preset frequencies do NOT divide the audible frequency spectrum up evenly. I did the math, and for the 9-band I came up with:

50
90
180
320
605
1210
2156
3841
7681

...And while those crossovers sound pretty good to me, if I can understand the logic of the preset crossovers, I'll absolutely switch back.

Thanks in advance for your insight!
Author:  hvz [ Fri Feb 21, 2014 12:09 pm ]
Post subject:  Re: Crossover Frequencies
Hm, they might have not been chosen that well - Bojcha already reported that with other frequencies the frequency response is more flat.

I'm a bit confused about your numbers too though, because:

50 * 1.8 =
90 * 2 =
180 * 1.78 =
320 * 1.89 =
605 * 2 =
1210 * 2.18 =
2156 * 1.78 =
3841 * 1.78 =
7681

While with the defaults:

40 * 2.5 =
100 * 2.1 =
210 * 2 =
420 * 2.02 =
850 * 2.06 =
1750 * 2.06 =
3600 * 2.04 =
7350 * 2.04 =
15000

The first frequency was set a bit lower to avoid very steep filtering at low frequencies which can easily cause artifacts.
Author:  blacklightradio [ Fri Feb 21, 2014 9:56 pm ]
Post subject:  Re: Crossover Frequencies
As I remember, I started at 25 Hz and went to 16 Khz... and I think I had to round the numbers.

25 Hz - 50 Hz = one octave
50 Hz - 90 Hz = not quite one octave
90 Hz - 180 Hz - one octave
180 Hz - 320 Hz - not quite one octave
320 Hz - 605 Hz - not quite one octave
605 Hz - 1210 Hz - one octave
1210 Hz - 2156 Hz - not quite one octave
2156 Hz - 3841 Hz - not quite one octave
*EDIT* 3841 Hz - 7681 Hz - one octave (rounded to the nearest whole number)

I think originally I was trying to do "one octave / not one octave" (my math skills can be lacking) but I found I had to do "less than an octave" more than "an octave" to get the math to work out.

...Looking back over the numbers, I'm not to thrilled with MY results, either. :lol:

I'd love to see Bojcha's numbers!
Author:  hvz [ Sat Feb 22, 2014 1:29 am ]
Post subject:  Re: Crossover Frequencies
Try his latest presets :) (X-mas and Sevdah)
Author:  blacklightradio [ Sat Feb 22, 2014 1:30 am ]
Post subject:  Re: Crossover Frequencies
Will do. 8-)
Author:  blacklightradio [ Sat Feb 22, 2014 10:36 pm ]
Post subject:  Re: Crossover Frequencies
Checked out presets; they use 7 bands, and I'd really like to use all 9.

I'll keep experimenting.
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