BU/BS/LR 6/12/18/24 EQ tBand types

M32 and X32 Digital Consoles
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G-Rad
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Joined: Mon Feb 28, 2022 9:53 pm

BU/BS/LR 6/12/18/24 EQ tBand types

Post by G-Rad »

Can someone please describe these EQ types for me in detail and what they do? I'd greatly appreciate it. Thank you so much.
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craigf
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Joined: Mon Apr 19, 2021 11:16 pm

Re: BU/BS/LR 6/12/18/24 EQ tBand types

Post by craigf »

6/12/18/24 is a db per octave measurement that describes the slope of the rolloff curve. 24db/octave is a steeper, more significant rolloff than 6db/octave. If you have a full-range 100dB signal with a 6db/octave hpf that starts at 100Hz, then the level of the signal at 50Hz (1 octave down) will be 100-6: 94dB, and at 25Hz (2 octaves down) it'll be 88dB. Quite a bit of low frequency content will still be audible on that channel. However if you have a 24db/octave hpf at 100Hz on that full-range signal signal, then the level of signal at 50Hz will be 100-24: 76dB, and at 25Hz it'll be down to 52dB; quite a lot of bass content becomes in-audible.

BU\BS\LR is short for Buttersworth\Bessel\Linkwitz-Riley; afaik they're the mathematicians who came up with the forumlas for the slopes of the eq. They each do different stuff to the phase of the signal around the cornering frequencies.

The phase\slope comes into play when multiple eqs (be they applied by a channel\bus\speaker management) are active on the same signal.
G-Rad
Posts: 45
Joined: Mon Feb 28, 2022 9:53 pm

Re: BU/BS/LR 6/12/18/24 EQ tBand types

Post by G-Rad »

Okay, thank you. I got it now.
Don't be dumb, get you some!
My drum covers and Video game covers
My band, Lost in Nostalgia
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