Filter weirdness demystified

[@andrigunawan5691]

Thanks to your video, I know by stacking a bunch of allpass filters to delay lower frequencies alongside a lowshelf filter boosting low frequencies, can "beef up" a bass boost effect though some songs don't work well with allpass-augmented bass boosts, which can be done using foobar2000 (with foo_dsp_effect, which comes with "IIR Filter" DSP effect) and Audacity (with a built-in allpass filter that you can do with "Nyquist Prompt")

[@JJDofficial]

yo thanks I watched this vid and immediately became a fast fourier transform, would definitely reccomend

[@lusid_music_uk]

Great stuff man! Very useful in depth knowledge. I’ve made myself a perfect frequency split recently with no phase shift or delay by getting a LP filter + 1 of the same LP filter in parallel with full spectrum phase inverted. So you’ve got essentially Chain 1: Low band Chain 2: Full band - Low band Then macros for controlling the cutoff. Just in case you didn’t know already. It’s pretty cool

[@KlareAudio]

Yeah I know about this! This was something I was originally going to talk about as a way to avoid the phase shift at the end of the video but I ended up not including it because I didn’t want to make it seem like “this is what you should always do instead from now on”. I figured that stressing that the phase shift is not that important but still useful to be aware of was a better way to close off the video- especially since most plugins still use the crossover approach. But yeah! Definitely a useful trick! There is also a M4L device that helps you do this; it’s called “invisible band splitter”. I have it, but I think I’ve only had to use it a single time- ever.

[@lusid_music_uk]

@@KlareAudio yea for sure it’s not important at all for the most part. Basically I just hate the way phase shift increases the peak meter reading. I mostly use the technique for my side chain bus because I want everything coming through “purely” and I also want a separate side-chain for my kick transient and kick body. (And also I don’t want to use linear phase eq because I want to play my midi keyboard with as little latency as possible)

[@notzeroth]

Great video (and video series)! the thing about duplicating EQs to make a crossover filter its because of the type of filter EQ usually employs. They mostly use butterworth filters (you mention them briefly), wich do a 90º phase shift and a -3db drop in the cuttoff hz. That's why when you stack a low pass and a hi pass, the shift is 180º and it cancels out. Linkwitz-Riley filters are basically two butterworth in series, so 180º shift and -6db drop in cutoff. That's why, when you put a low pass and a hi pass, you get 360º, so frequency reamains the same

[@KlareAudio]

Yeah, I learned that while writing this video. I wanted to avoid going into filter type terminology as much as possible because in practice it's not something you need to worry about while producing, feels more like a plugin dev thing. Would rather incentivize people to just give it a shot and find out if their EQ has the right slope type than to throw more names at the viewer, but I wrote them in the annotations for those interested in learning it. The EQ's I show in the video all use butterworth filters BTW

[@notzeroth]

@@KlareAudio aaa that explains, I was wondering why you had the names in the screen but you didn't mention it explicitly. Makes sense yeah, the video is already packed with information. Gud stuff again

[@mil3sperhour]

I always wondered why the built-in OTT of serum just never worked for parallel processing in comparison to the stock Ableton one, thank you for this information dude! :)

[@pumodi]

OTT Shots Fired

[@lusid_music_uk]

Btw I found this video while trying to find out how filters/eq work on a fundamental level. You seem like a pretty knowledgeable guy. Do you happen to know why filters ring in the first place? I tried searching online but any explanation I could find was waaaaaaaaaay too complicated 😂 All I could make out was something to do with holding samples and doing something with pi at the crossover. Madness

[@stasysmusial]

incredible video dude, finally understand that stuff now haha

[@borrasca]

Banger

[@Eko_____]

What causes the pre-ring in linear phase filters?

[@KlareAudio]

it's the post-ring, but shifted backwards. The filter subtraction signal is being moved back in time to better phase-align with the original singal, shifting the ring before the transient. with really steep highpass filters and a really high linear phase buffer it's obviously the worst case scenario for pre-ring, but it makes for a good example

[@borilvasilev2411]

These are so good

[@minty0723]

i love you ;P

[@SoundPeaks]

Cool, but OTT is dope

[@KlareAudio]

Big agree It’s a bit of a low hangin fruit to make fun of it but I think it’s funny so whatever I personally don’t really like the vst version, from an engineering standpoint the default preset is an abomination and it doesn’t really let you change it all that much

[@puro9326]

First