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Would be cool to see a 3d view. You do have 3D models for all your parts, right?

I wish I had read this a few years ago, before I spent a whole week basically figuring this out for myself the hard way. Another thing that helped was to pick an op amp that was relatively slow and low-power. TL062 worked well for this.

Um... where's your ground pour?

I usually just input the schematic into a circuit simulator and see if it works. I might place virtual scopes/meters/spectrum analyzers/signal generators around the schematic and compare with what the physical board does. After I discovered circuit simulators I almost stopped breadboarding. As...

^can't that be turned off in the preferences?

Very true. When doing psychoacoustic experiments we go to great lengths to match levels very accurately (to small fractions of a dB). Louder is almost always perceived as sounding better - even if it's the exact same source, just played 0.5dB louder. Consider that a great studio speaker...

BBD biasing for lowest distortion might fix it, if you haven't already done that.

What do you print the top label on? Unrelated hint: OPA2196 and OPA2990 are good options for guitar/bass headphone amps, especially if battery powered (super low idle current), as long as you use a series resistor on the output. Something like 20 ohms or more.

Rest assured that audio can be analyzed way, way beyond any human's ability to hear, just as technology obviously exists to see tiny things far beyond what the human eye can see. Now, how that translates into terms like "this sounds thin, or grainy" or such, I don't know. These terms are...

^ Exactly. We do this kind of stuff all the time. Pulling up faders that aren't even assigned to anything, tweaking knobs that do nothing... Then laugh our asses off after everyone's gone 🤣

^ oh yes, the technology (and methodology) to prove/disprove audio perception very much exists. The problem is that people often don't want to accept the results if they contradict their preexisting ideas. If you think something sounds good, or different from something else, then it will sound...

Enlarge your ICs with this handy timer:

Well, it looks great, so it failed successfully!

I ❤️ SMD

^ Great write-up, I wish I had the patience to do something like this. The contribution of resistor noise is important and often overlooked in audio designs. A seemingly benign, mostly useless "current limiting" 10k resistor in series with a TL072 noninverting input degrades the noise floor by...

How much cheaper can they be than the $0.30 MMBFJ201, available by the boatload from major distributors?

Discerning, gentle electrons will never be seen in public going through anything less than truly vintage carbon-in-bee's-wax resistors.

It's not true bypass if there's any load on the signal from your circuit. C6/R102/R101 is a load.

Yes, I meant audible.