EQ Question

[Hurlant Chamber]

Using Ableton 9 - I thought high/low pass filters out everything below or above the cut off but, for example

if I high pass from 800khz then have a notch at 400khz - if I A/B this notch if still affects the sound - shouldn't it be unafffected?

 

[xiris]

They roll off the frequencies by a multiplier, ranging (usually) as such 6db per octave, 12db/oct, 24, 36, 48. Its not a brickwall cut. (Though some eqs/filters like ozone's eq do have a brick wall cut, which essentially mutes everything above/below it).

 

[xiris]

So your high pass is turning down frequencies below 800hz more and more a you go lower an lower. If you notch(edit: notch-boost) at 400 you'll re boost those frequencies

 

[CTJake]

If it's cut then you shouldn't be able to hear it, but some EQs don't cut as 'sharp' as others and you'll still have lower frequencies present but with reduced levels.

 

[Hurlant Chamber]

They roll off the frequencies by a multiplier, ranging (usually) as such 6db per octave, 12db/oct, 24, 36, 48. Its not a brickwall cut. (Though some eqs/filters like ozone's eq do have a brick wall cut, which essentially mutes everything above/below it).

Cheers - so what's the best way to brickwall stuff out?

 

[xiris]

To the best of my knowledge.. ozone is the only eq i know of with a "brick wall" option. Im sure there are others out there w this ability though. Why do you need to brickwall something? I dont think ive ever actually used a brickwall high/lowpass. Just curious. 48db/oct is already pretty steep a cut (turn one of your faders down 48db and youll see what i mean).

 

[Rounder RG]

The closest I think you will get out of the box wth Ableton is the "EQ Three". Use it like three kill switches on a DJ mixer.

Turn the low frequency 800hz, set it at 48db and then kill the low. If you want a sharper cut you can duplicate the EQ Three a couple of times which will keep rolling the tail off the sound but probably at a detriment to the quality of the original.

Other than that the free Computer Music Magazine Philta does pretty good job of completely killing the sound with its 96db drop off.

 

[EvezDroppin]

Doesn't using a steep curve give you issues with phase cancellation? Or am I going full retard, thanks.

 

[johneysvk]

it's hz, not khz.

 

[xiris]

Doesn't using a steep curve give you issues with phase cancellation? Or am I going full retard, thanks.

I've heard this before in another forum.. haven't tested it.. could just run something stereo thru SPAN and high/low cut it to hell and back and see what occurs i suppose