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The only area you'll really run into problems is with pipe resonances, which will generally produce a narrow major error (either peak or dip) in the 5-10kHz region. You shouldn't be attempting to EQ these anyway, as they're non-minimum-phase and you need to learn to identify them. If your...

No. This is why it’s essential to measure with the EQ applied and adjust the EQ so that the difference between measurements is very small. The differences in acoustic impedance (of both headphone and fixture) make it hard to develop a transfer function that can translate across variations in...

You're just needlessly introducing confounding factors. Take one pair of headphones and test them with the stock cups, then switch to one of the Lawtons and retest the same pair. If you're having problems with 'weird EARS resonances' from 3kHz up then plot multiple sweeps with independent...

It looks like there's quite a lot of inter-unit variation. Maybe it would be more instructive to test the same pair with stock and custom enclosures (it might be an idea to do multiple measurements, reseating inbetween, to check the precison of your setup).

Unfortunately, if you are EQing based on measurements of other headphones, then you aren't really matching them to the target. Measurements from oratory, for instance, will get you reasonably close to the target, but there's sufficient variation between units, pads, fitting, etc that you're...

I think the horrifyingly dangerous effects of EMI were covered quite comprehensively in Better Call Saul:

Still a lot of modulation of the noise floor (over 5 times higher with 20kHz signal compared to 1kHz). Pity.

I had to laugh at the bit where he celebrates the amount of time this machine saves him. You probably already know the obvious snarky digital riposte, so I’ll resist making it. :) But it’s a bit disappointing that even a high-end washer like this still leaves clearly audible surface noise...

It’s important to note that the authors here are describing a naturally-occurring repair process that is, presumably, already at work. There’s a wide gap between this and finding a therapy that will correct or even prevent noise-induced hearing damage. But it does suggest a possible pathway...

I recommend skipping the marketing fluff at the start and just looking at the data specs. Per Table 3-9 the fast roll-off filter on a 44.1kHz signal is down 0.01dB at 19.999kHz and -3dB at 21.256kHz, then -110dB at 24.123kHz. Not quite as good at the best offerings from ESS or AKM, but...

You can find plots for the filters provided in the datasheet: https://statics.cirrus.com/pubs/proDatasheet/CS43131_DS1155F2.pdf#page141 It’s basically linear or minimum phase and proper or poor attenuation.

I'd recommend chapter two of Ken Pohlman's book. For a large signal, the quantisation error becomes uniformly distributed and can be treated as noise. This leads to the 6.02n+1.76dB signal-to-error equation. But for small signals, the error becomes correlated with the signal and thus is better...

Is the USB receiver chip asynchronous or isochronous? This can be tested on a PC with the Thesycon dumper. The chief reason I went with the dongle I currently use (JCally AP90) is that it runs an asynchronous interface. The Tempotec Sonata I used previously is very good, but its isochronous...

The big problem here is that it’s not showing up in lsusb. Step 1 would be to make sure the Peachtree is actually working properly. Does it work if you connect it via USB to a PC? Try using a different cable, or setting it to USB 1 mode.

One which is used in a lot of headphone amps is the TI 6120. https://www.ti.com/lit/gpn/tpa6120a2

Unfortunately this only applies to the standard reviews, not items covered by the columnists (who are basically Herb Reichert and Michael Trei these days). Reichert used to be an Audio Note Japan pusher for the east coast, so is ripe for any dodgy tube maker who can spin the right sort of story...

They're talking about dynamic compression as a result of voice-coil heating in this bit. He's saying that a hpf on the main speakers will lead to less power going to the woofers on the main speakers, and thus less heating in the woofers in the main speakers. This seems reasonable. This refers to...

The LHC is, of course, transporting charged particles, thus meets the definition of a cable. But electricity in ordinary cables is only travelling at 90% of light-speed, whereas the LHC boosts protons up to 99.9999991% of c. This would obviously be the perfect upgrade for those looking for a...

No, I think he means a handy:

It makes sense to use minimum-phase for filters in the audible band, though the ringing only really becomes audible if using a steep filter slope. But anti-imaging filters are happening right up at 22kHz (the ringing is actually a chirp with the max amplitude at the filter frequency) and the...