Linear Phase Analog EQ. Wait, what?? 

Dan straight livin’ in 3019

Apparently you can negate phase shifting from preamps with recording your source reversed as well. Just tried, it works. 🤷‍♂️

I'll have whatever you're smoking if I can come up with stuff like this!

You're a real audio/mixing *engineer*... I mean, so many claimed mixing engineers know jack shit about how EQ's work and how phase works... this is just joy to watch.

If you allow for viewing the flip operation as landing in negative time, it's called zero phase filtering, because the phase of the flipped run cancels the firsts runs phase. The mathematical proof: Take the input signal x(n) for all samples n to the Fourier domain, X(jw). Applying the filter (in the frequency domain) makes it X(jw)H(jw). Now flip it and we get X(-jw)H(-jw). Then apply the filter again to obtain: X(-jw)H(-jw)H(jw). Do the last flip and we land at: X(jw)H(jw)H(-jw), which is: X(jw)|H(jw)|^2. So indeed a perfectly squared absolute frequency response without any phase manipulations.

I remember discovering this in an article about sample editing in the 80's half and half with one reversed. Your precision deserves respect. Thanks for sharing your intuition

Very cool. Intuitively, it makes sense that the phase shift should be cancelled, but I need to watch this and think about it and maybe draw some figures to really convince myself. Thanks!! You never disappoint!

Come back to the beginning of the channel since I'm very caught up at the moment, but craving a Dan Worrall video! This is some far out stuff man. Favourite RU-vid channel by a huge margin

One of those "this is so dumb it's genius" moments! Would never have thought of this on my own but now that I've seen it done it's so obvious I'm kicking myself that I didn't. Brilliant!

Oh yeah! I remember having this exact idea once and digging around on forums to see if anybody else had the same idea. I think I found something about it in some old trade journal. I never got around to implementing it because it didn't seem all that practical. Awesome that it works!

how can a mad scientist sound so smooth and coherent, holy

Dude that's mental. I mean I would never ever ever think of anything even a smallest bit close to this kind of wild trickery. Dayum.

A way to make this more tangible is to put a single sample of sound through an EQ. Zooming in on it you will see that the little ticking sound now has a tail after it, in the frequency of the added EQ boost. Do the same with a digital Lineair Phase EQ and you will see that the tail now is mirrored before the sample starts. As you showed this is the exact same thing as running audio through an EQ forwards and backwards.

I had to watch this two times to fully understand it. Great idea from a genius mind. Thanks very much for sharing!

Woah, these are super well made. Thanks for making these, Dan!

Very interesting technique, not for everday usage, but definitely one to keep up you're sleeve.. As always, top notch description and demonstration.

holy shit! This man is a wizard! A god among mere mortals! Having only a couple years of super light hobby mixing experience I can say you are the biggest inspiration for me. I love math and engineering and just peeking into the world of phase has really ignited the fire. Everybody in your comments is right, you are the most technically talented audio engineering channel I've ever found. Everything you say feels like it's right at the edge of my knowledge, but that's a good thing. I love learning and this shit is so cool, my fuckin jaw was on the floor when you explained the reverse trick. Have a good day man :)

THAT..... is freaking genius!

Hey Dan ! Love all your tutorials and explanations. Please make more of this kind of videos !!

Welcome back to your channel!! Awesome demo like always. Thanks.

I can't believe you actually made an analog filtfilt, simply amazing

And here I was expecting you to invert rather than reverse but this is slightly more clever and I love it

I appreciate the intelligence & simplicity involved in this. Thank you.

Wow. Mind blown. Bravo Dan!

Sir, thank you for the perfect sounding EQ! You made my mixing a joy

WHAT A BANGER TRACK

Nice experiment! One rather similar thing I’d like to hear you explore: frequency shifter up -> some processor -> frequency shifter down. Then macro control the frenquency shifters to always be the opposite. I’ve experimented with this a bit and you can create weird flavours to distortions and such!

Nice technique! Very unique. Great find!

Ingenious! Thank you!

what a smart move. nice narration voice, nice brain, damn.. you got it all dan.

You're awesome, as always!

Dan, this is awesome sick shit! I love all your videos, they help me improve a lot! Thanks for putting it out there!

Genious simplicity and beauty of techinque :)

Very good stuff, maaan!

Love your videos!

man you're crazy , in the greatest way possible ❤️

There is a slight difference with backwards compression. If a signal is compressed then reversed, the ducking will happen before the peaks, and will stop right before the signal goes back under the threshold.

Thanks Dan!

Genius - I learn so much more from your vidz

Super creative! You should have more subscribers :)

This one just flew right over my head

Brilliant tip!

great channel for knowledge

Thank You so friggin' much Dan!

Thanks Dan

I'm floored

This is one of the cleverest things I've ever seen

Holy Smoke, this is some next level stuff o.o

a beautiful idea!

Speechless

LMFAO this is hilarious, love it Dan

You're insane.

Really cool

nice trick. gives me the idea to apply different effects than eq on the reverse signal. i think it is a winning concept whenever phase is a concern for the mixing engineer. lots of possibilities. maybe too much. not for nerds though.

🥂🤯🙀 thanks Dan !

Bruh. You a genius.

Genius!

This is gold

u genius sir thnks for sharing

what in the fuck is Dan doiOHMYGOD!! Love it

You want a transversal equaliser!

Awesome

That is a fun fact!

Pretty elaborate. You should do click baity video "5 hacks to achieve perfect mix every time" and include only tricks like this.

Wow. That's clever

wow... mind.... BLOWN ! 💥💥💥💥💥 (5 out of 5 boom's)

I had my drums sent out into my Toft ATB desk and back in on a stereo Chanel. Then I mixed my original drums in the box and added in the Toft ATB underneath it ... caused a few phase issues .....But I just moved the stereo track of the toft mix down a tad and seemed to work.... But I like what you have done here, so might give that a shot next time. Thanks 🙂

MAGIC!!!

You are a genius. I sort of understand how this works but I also totally don't. Impressive stuff though!

You've got some brass, trying a trick like that.

Legend

nice one - maybe you also could bounce the digital source through the EQ's with 0-value to mix that with the strongly EQ'd signal? Those should have similar phase characteristics that work well together! Best regards

How delightfully sneaky...

Yeah, this really cool, :)

Interesting thought experiment for those days with too much time and not enough effort. I’ll let you know if I ever encounter one of them.

4:43 Oh my gooooooooosh ! DAN YOU ARE A GENIUS !!!!!!

needless to say this will also work in a daw when you don't own a linear phase eq. minus the analog part of course ;)

This is crazy :-)

genius

Amazing. I admit re people who come up with things i would never think of. One question i have. Would the Sound radix Allign Plugin solve this problem?

Hi Dan. I have a quick question for you. I've heard some people saying that this trick is only addressing the issues associated with the round-trip latency but is it?

Could you please share with us what you've been smoking? I want to come of with ideas as this as well

Sorry if I am sounding confused but don't you get twice the amount of filtering as frequency cuts weren't time dependant.

Video 3... I have switched accounts from my band to my personal. I'm a middle aged sound guy and I'm not exactly sure what phase shift is. Hmm.

I'm blown away and impressed with your "What's The Matter With Stock Plugins" vids; but doesn't this simply cause a opposite phase shift in the reverse time direction?

WHAT IS THIS MAGIC!

A few dumb questions: 1. Is pre-ringing still a problem with this method? 2. Is there any perceptible benefit to avoiding phase shift if you’re EQing a single track (i.e. not being processed in parallel, not part of a multi-microphone arrangement, no bleed from other elements in the mix)? 3. This could still be done with minimum phase plugins (as opposed to just hardware) too, correct?

Hey brother when you re reverse the reversed clip ... Doesn't it cancel the effect of what you did . I'm sorry if I am bothering you with a stupid question ... But I'm in doubt here

Gobsmacked :D

so i think this means that i still get the pre ringing if i do too much EQ, right? which obviously won't be the case in mastering stage.

YOU ARE GOD, DAN!!! 🙏🏼😍 i am watching ALL your content!

Dan, where did this genius idea come from? Is this your own engineering, or a magic trick you picked up from another audio wizzard?

This raped my brain. I love this and can't wait to try it. Dan keep it up!!!

Holy shit.

Aw man, my ears aren't honed enough to really hear what's going on here >

aren't bessel filters phase linear ? (besides obvious aberrations like phase noise and temperature sensitive inconsistencies )

:o!

if there wasn't compression involved, could you not run the 1st parallel at 1/2 eq, then run the 2nd parallel from the reversed original dry signal and get the same result? if not, why does the 1st parallel have to be processed a second time (in reverse, obviously) to counter the phase effects?

WHAT

Damn