Does phase shift ACTUALLY cause EQ? Dan Worrall response

My website: www.apmasterin...
Dan Worrall made a video not too long ago talking about phase shift when using EQ, and that EQ doesn't cause phase shift but rather phase shift causes EQ. Despite mostly agree with Dan, I offer an alternative perspective with reactance being the thing which causes EQ. I go into detail here with an all pass filter circuit and discuss the importance of reactance.
Dan's original video: • EQ Doesn't Cause Phase...

[@MadMaxwellP216]

I like how Dan ends his video by asking "What voodoo magic causes phase shift in an all-pass filter?" and you continue the conversation from there

[@GingerDrums]

This is inception. Dan could now make a video about reactance, saying: there is more to say here. Without physics, we would not have reactence or a universe or electricity...

[@APMastering]

i don't see it exactly like that but ok

[@GingerDrums]

@@APMastering I would argue that framing is about adopting the most useful way of viewing of a concept, not about which of two valid viewpoints is more fundamental. If you are building an EQ or doing engineering, I'd argue your view has more utility, if I'm using an EQ, then it's most useful to know that phase shift is what is bringing about the change. Edit: I didn't mean to demean your video. It's not "just" inception, it's a fascinating and well thought out video. The undertone of one-upmanship is slightly irritating but that's your algorythm-win I guess.

[@APMastering]

ok i get what you mean. i really tried to avoid any oneupmanship vibes here by praising his video etc however i had a genuine nitpick about saying you can drive filters from all passes because as i show, all passes contain filters, so it's not really a chicken and egg thing like his follow up but a different cause, and i didn't see anyone saying that, so i thought it could be a valuable addition to that theme here on audio youtube

[@GingerDrums]

@@APMastering Seems fair. At the end of the day the video is leveraging extranious detail / nitpick to marketing your paid content to Dan Worrels community. At the same time the framing is less useful to Worrels audience. I think I would feel differently if you weren't selling something at the end of this. I don't think you are doing anything wrong, but something feels disingenuous. Edit: The same issue with your "all digital eq is the same", the vibe is clickbaity/arrogant and I'm leaning towards not engaging with your content because of it, which is a shame because you seem informed and smart.

[@APMastering]

@@GingerDrumsthe explicit public mission statement of my channel is to create entertaining videos on audio and in doing so promote my courses. there's nothing hidden or trojan horsed, it's written in my public youtube about section and i promote my courses in every video. If you don't want to buy my courses, don't, but that has nothing to do with enjoying my content otherwise and i wholeheartedly reject the idea that having products to sell is bad. The other people on youtube are either amateurs with bad content for free, or professionals monetising in another way, for example through affiliate and paid placements which is hidden and not impartial at all. i'm impartial and obviously transparent with what i'm selling. if you don't like my offerings, you can watch my content without buying them

[@pipelineaudio]

I love seeing you make all the troo beliebers big mad lately! Keep up the good skeptical work

[@ProjectVastness]

Very interesting subject. Awesome. And yes Dan does awesome videos .

[@APMastering]

thanks

[@TeeDubz]

Yes, this is great! very effective tutorial. Would love to see more on op amps, tubes and transformer interactions etc...

[@APMastering]

thanks. i feel like this video was maybe too complex though and so got less interest than previous videos, so i need to find a better balance of complexity i seems

[@luisdanicoy]

this videos are pure gold. Love them! Any chance of focusing on preamps?

[@APMastering]

lots of requests for clippers, saturation / preamps. I'm sure I will get round to it!

[@Rhuggins]

Love to see the more deep divey technical stuff- thanks!

[@5adb0iMusicOfficial]

Amazing! Loved the breakdown on the circuitry and signal flow 🔥🔊🔥

[@MuzdokOfficial]

Well explained🎉

[@deschamps555]

Great explanation on the basics of these analog components and circuits. But the topic is way more general I think. You focused on some implementations, in your case implementations in the analog world. But just because you showed one basic all pass filter analog circuit in which there is a low-pass part, it would not necessary mean that you need low pass filtering for an all pass transfer function in every case. There are 'filters' around everywhere. You can model them in digital, you can implement them with analog electronic parts, but you can build a bass trap in your studio to dampen certain frequencies - you created a kind of an acoustic filter... So I would say to decide what causes what, one has to dive into signal theory... and then it can be applied to any implementation. Note: probably it would be better to phrase the question without the word "EQ". We are courious about amplitude changes with respect to phase shifts. EQ is a tool you use, amplitude is a more exact scientific term, right? :) But this goes really do Dan I guess.

[@APMastering]

i 100% agree. to be honest i mostly just wanted to take the opportunity to explain reactance because its at the foundation of analogue signal processing

[@CARPAudio]

Love your videos!

[@chatwithmichael]

YESSS!!!! MORE PLEASE!

[@Beatsbasteln]

I'm not a big fan of analog audio in general. I once had a course on it in university and while I forgot most of what was going on there I still remember that every analog component has multiple functions at the same time. one of those basic components for example both lowpass AND saturates the signal, which would be 2 entirely unique and seperated processes in digital audio, which is why I feel like digital audio does a more precise job at explaining how certain effects work. for example filters can be either FIR or IIR. they both consist of short gained delays and the only difference is that IIR filters also have feedback delays. the real question is not "what's a filter?" because if you tell people it's just a bunch of delays they still don't know why the delays cause phase shifts or frequency responses, but the question is how to calculate coefficients for filters to make them have these specific properties. and suddenly you find yourself in the mids of terms like z-plane, complex numbers, unit circle, ecliptic filters, biquad filters etc. so if i was asked what's a filter i'd say: a configuration of delays based on trigometric equations to fulfill certain frequency and phase responses

[@APMastering]

not sure about saturation here in the LP filter as caps and resistors don't saturate as such... most of the formulas you use on dsp come from analogue principles. of course circuits are more complex because of current flow and impedances but there are many shared principles and a lot of the math you use literally originates from telephone electrical engineering manuals

[@Beatsbasteln]

@@APMastering that's true. a lot of the great ideas in dsp come from analog inspiration. but still they end up being more precisely formalized in the world of dsp math

[@sytiravajous]

Been getting into electronics lately, your videos started from making no sense into gradually making little sense to me. It's a fun process and analog audio is fun.

[@APMastering]

nice one, its hard to gauge how advanced I should make my video as im still new on KZbin and my audience is still growing

[@StevieBoyesmusic]

A Baisic 6dB digital lowpass is just a one sample delay with feedback. y[output] = x[in] + ( y[last_output] - x[in] )* coefficient

[@APMastering]

sure. this is the same effect and idea as an RC LP or inductor. The coefficient is essentially the same thing as the resistor charging the cap.

[@davidzaydullin]

1:18 thats an analog implementation digital allpass doesnt have lowpass and is created from 2 comb filters

[@APMastering]

you can create an analogue style implementation in digital. perhaps it's less efficient to compute. the original was on EQ in general AFAIK.

[@davidzaydullin]

@@APMastering in my view its obvious that he talks about digital eq's. though maybe he should've said that the video is about digital filters so that no misunderstanding happens.

[@APMastering]

to me it's more like he's talking about EQ in general because the whole point of that conversation was phase shift and people trying to minimise it. his point is that we shouldn't fear phase shift because eq is caused by phase shift. this is consistent with his other videos. i guess if he specifically means digital then fine, but then his entire position on phase shift makes zero sense since the unique benefit of digital technology as opposed to analogue is linear phase

[@jrgroberts]

Electronics and audio is simple. Just get a book and study! I did. You can too.

[@APMastering]

i wouldn't necessarily say it's simple but i like the positive attitude! 😀

[@tonyrapa-tonyrapa]

So, did you study electrical engineering or sound engineering at uni? I'm assuming that if it was sound engineering, then there were modules of electrical engineering as part of your studies? Very cool.

[@APMastering]

I studied audio/music engineering but I learned very little from uni. I learned almost everything I know independently either by working in the industry or reading etc

[@afganjabrailov2472]

What do we do?

[@APMastering]

listen to captain beefheart

[@ManCalledMif]

Is this electronic engineering?

[@APMastering]

yeah

[@che7969]

what causes reverb?

[@APMastering]

all pass fillers and feedback in digital. in analogue, springs and sheets of metal. in acoustic, reflections.