For record, though: I do understand that the in-room performance of a HomePod will not compare to the performance of studio monitors or other accurate speakers when listened to from their sweet spot. At least we agree there I think.
It also makes little sense to feed a sine wave through the HomePod at each frequency because of the amount of processing Apple has this thing doing. Every noise is sending through is being compensated by the microphones and being balanced in isolation.
The off axis measures he spent hours doing are utterly pointless too - there is no axis on the HomePod. It is a non directional speaker, there is no sweet spot, no front, no middle to start from. It has a non directional upwards woofer and then 12 tweeters around the outside - technically in between some of the tweeters would be off axis but you're talking of a very small area, there's no need to measure it all the way around.
12 inches away from a speaker is largely going to negate the effects of any room anyway - the mic isn't going to be picking up my room interference and it's not where you'd listen from to have impact from the room either.
So all in the results don't tell us much because without disabling the processing you can't tell what the speaker is doing - however we can very easily use our ears to hear that the 4" woofer is pushing out so much exaggerated bass it sounds like it's attached to a 10" subwoofer, and the top is reduced (as a profile decision presumably).
I have two Adam A7X's, large bookshelf sized speakers with 7" woofers in both, you could fit probably 6 HomePods into the space of two of them, yet they don't create bass anywhere near as big as the HomePod because it's designed to be accurate and flat, not hifi and impressive. If you switch between the Adams and the HomePod at the same volume level, the difference in sound signature is beyond comparison - and of course it would be, one is flat, neutral and revealing, the other is highly processed impressive sounding hyped hifi speaker.
There's nothing wrong with the HomePod but it's still silly to start declaring it a flat response speaker when A. It wasn't designed that way and B. anyone with ears listening for 4 seconds can hear it isn't. But i'm almost certain if you feed it sine waves out of context into each frequency band the microphones are going to pick it up and try and balance it to se a set DB level.
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Wrong, Sennheiser HD800s’s are NOT tuned to a "flat sound", mind you what DAC, tube or solid state, balanced or single ended.
They one of the most neutral and natural headphones on the market - sure you could pair them with a DAC and and coloured amp that changes that - but if you're mixing and want a reference headphone, apart from it's peak at 4khz it's more or less as flat and revealing as you can get when paired with something like a Vioelectic amp and the studio DAC and you're not going to find much else as clinically revealing and natural sounding.