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We make no claims that a virtual or reflection based surrounds replace actual speakers. I am editing the 4th edition of Toole’s Sound Reproduction Book and I can’t remember the exact term he uses to describe them but it would not be approved by marketing. The reality is that spraying sound off...

After reading that AES paper that shows the center channel is barely used for Atmos music mixes I've decided you can save some money when choosing a center channel depending on if you watch Atmos films versus listen to Atmos music.

I replaced my relatively high output impedance RME UCX with a low output impedance RME ADI 2/4 Pro SE after measuring the TruthEar IEM which has relatively low impedance in the bass causing a peak in the bass response . This is a case where buying a good cheap headphone didn’t save me any money...

Yes. I fixed it. Thanks for pointing that out.

OK I need to review my ages which I think are being intermixed with each other . Timeline of the Periods in History Stone Age: 3.3 million to 5,000 years ago. Bronze Age: 5,000 to 1,400 years ago (1,200 BC) Iron Age: 1,200 BC to 500 BC. Classical Era: 500 BC to 500 AD. Medieval Era: 500 AD...

This sounds right except two slight changes I would make 1. I would change electrical impedance to acoustic impedance -- that is what he discussed. 2. There is a standard -- the DF response (ITU/AES/). We know it's not a "real " standard.

I interpreted the Dark Ages as before the Harman Research but maybe I am biased and only hearing what I want to hear - like a YouTube reviewer :)

No it's not 100%. I've found some example that use it well. I don't have list of them but they exist -- Recently U of Hudderfield did a survey of 100 Commercial Pop Atmos music tracks and measured the average level of each channel. The center level is the lowest only after the LFE which is often...

There is no dispute that the natural ear canal resonances for an open ear shift when the ear is occluded with an IEM depending on the insertion depth, etc. The past year we've spent some time modeling earphones in different ear canals (based on MRI scans) in COMSOL and compared the results...

As I said the adjustment was made using the B&K 5128 DF response as a baseline so it’s relatively smooth at HF. I cannot say if the lack of energy in the lower treble in AAP Max is related to HF response. You can check out their scientific publications or ask the person in charge of headphone...

No, but Gaetan Lorho looked into that for the over-ear headphone and found the gain was the dominant perceptual factor not the frequency of the resonance. https://aes2.org/publications/elibrary-page/?id=14966

I hope to publish an AES paper on these experiments in the next few months.. when I add more listeners. But essentially it involves using a method of adjustment where the DF target is adjusted in 3-bands

Ω I was referring to the tuning of the headphone based on a measurement on a standard test fixture like GRAS45CA or B&K5128 -- the HPTF. Not as a result of some dynamic active sensor that adjusts for the listener's ear canal acoustics

I might have agreed with you until I did this experiment where listeners were given a knob to adjust a filter centered at 3kHz (Q = 2) and could adjust it in 0.25 dB increments over a range of +6 to -10 dB. This was an IE headphone tuned to the B&K 5128 DF response after they made adjustments...

This is the measurement of the headphone in the AES paper in 1967 showing the headphone measured on a human using the probe mic in the cup., and the same headphone measured in the 6 cc coupler which they say is accurate only up to 600 Hz. Not sure how you translated that measurement to what...

I was told by someone who left Apple that they tamed the so-called "ear gain" centered at 3 kHz to accommodate different ear canal geometries that produce different amounts of gain.. The AirPods Pro 2 also have reduced gain through there. The SoundGuys target curve does as well although their...

The science behind it is strongly featured in the advertising as "humanized" listening where they measured the headphone placed on humans using a probe mic inserted in the cup. But apparently they didn't bother to carefully ask the humans how it sounded?

It’s been awhile since I have done an A-B comparison but talking to Revel staff last night at AXPONA I’m told the 226be are a significant audible improvement. Maybe Im trying to convince myself not to spend the extra money ( a bias). If I change my mind I will have A pair of F206 and center...

My main left /right speakers in my 7.4.4 setup. I’ve thought of replacing them with 226be but they are so good it’s hard to justify.

We have implemented something called Personifi in a JBL headphone app that applies EQ based on a hearing test and user input related to age, gender and listening experience. I talked about this in a couple of slides at my CanJam NYC 2024 talk.