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#1
Posted to rec.audio.high-end
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Apple HomePod measurements
I cannot vouch for the accuracy of these measurements, since
I had no part in them. I am just relaying this article to you since it might well be interesting. https://www.reddit.com/r/audiophile/...e_perspective/ TL;DR: Room correction forces a rather small speaker "All the way from 40Hz to 20,000Hz it's ±3dB, and from 60Hz to 13.5Khz, it's less than ±1dB" -dsr- |
#2
Posted to rec.audio.high-end
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Apple HomePod measurements
Once upon a time on usenet -dsr- wrote:
I cannot vouch for the accuracy of these measurements, since I had no part in them. I am just relaying this article to you since it might well be interesting. https://www.reddit.com/r/audiophile/...e_perspective/ TL;DR: Room correction forces a rather small speaker "All the way from 40Hz to 20,000Hz it's ±3dB, and from 60Hz to 13.5Khz, it's less than ±1dB" -dsr- Interesting, thanks. -- Shaun. "Humans will have advanced a long, long way when religious belief has a cozy little classification in the DSM*." David Melville (in r.a.s.f1) (*Diagnostic and Statistical Manual of Mental Disorders) |
#3
Posted to rec.audio.high-end
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Apple HomePod measurements
On 2018-02-15, ~misfit~ wrote:
Once upon a time on usenet -dsr- wrote: I cannot vouch for the accuracy of these measurements, since I had no part in them. I am just relaying this article to you since it might well be interesting. https://www.reddit.com/r/audiophile/...e_perspective/ TL;DR: Room correction forces a rather small speaker "All the way from 40Hz to 20,000Hz it's ±3dB, and from 60Hz to 13.5Khz, it's less than ±1dB" -dsr- Interesting, thanks. And rather more interesting: https://www.reddit.com/r/audiophile/...y5&sh=c31751c3 TL;DR: I'll quote a chunk from the middle: ------ quote begins This paragraph is grossly misleading: What we can immediately see is that the HomePod has an incredibly flat frequency response at multiple volumes. It doesnt try to over emphasize the lows, mids, or highs. This is both ideal, and impressive because it allows the HomePod to accurately reproduce audio thats sent to it. All the way from 40Hz to 20,000Hz it's ±3dB, and from 60Hz to 13.5Khz, it's less than ±1dB... Hold on while I pick my jaw up off the floor. At first glance it looks like this is about the frequency response of the speaker, and indeed if it was, these would be impressive numbers. It's not, though. It's about deviation from linearity, which has to do mostly with power compression and DSP limiting. It has nothing to do with frequency response, which is a much, much more important metric. The way that passage is worded is so mind-bogglingly misleading that I'm having a hard time believing it was not written that way on purpose. While I agree with the experimenter that the bass performance of the speaker looks interesting considering its small size, there's some misleading stuff in there too. When the experimenter writes "Apple's got the HomePod competently producing bass down to ~40 Hz, even at 95 dB volumes", that does not mean that the HomePod can produce 95 dB at 40 Hz, which would indeed by extremely impressive for its size. Instead, the linked measurement shows that the HomePod will limit itself to less than ~80 dB at low frequencies. Now the automatic distortion control is interesting perhaps, but still, there's no magic here. (A proper subwoofer can go to 100+ dB at these frequencies, but it's also much larger in size.) The experimenter mentions that the speaker is capable of room correction. It's not. Proper room correction systems can get frequency response variations down to ±2 dB or less - that's not hard to achieve as it's mostly just about inverting the room response. The experimenter's own measurements, when viewed at the proper scale, show that the HomePod doesn't do any better than the KEF or any other speaker in that regard. ------ end quote. |
#4
Posted to rec.audio.high-end
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Apple HomePod measurements
Electronics are seldom at issue when reproducing sound, much to the chagrin=
of their manufacturers who would love to convince one otherwise.=20 Transducers, however, are very nearly always at issue, and so remain the th= e last frontier in audio. Speakers are a matter of moving air, and that is = a matter of power and physics. So, one may draw one's own rather obvious co= nclusions on the relationship between speaker size, volume possible, power = required to achieve that volume, and the bandwidth that speaker is capable = of covering - all pretty basic physics. Peter Wieck Melrose Park, PA |
#5
Posted to rec.audio.high-end
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Apple HomePod measurements
"Peter Wieck" wrote in message ...
Electronics are seldom at issue when reproducing sound, much to the chagrin of their manufacturers who would love to convince one otherwise. Transducers, however, are very nearly always at issue, and so remain the the last frontier in audio. Speakers are a matter of moving air, and that is a matter of power and physics. So, one may draw one's own rather obvious conclusions on the relationship between speaker size, volume possible, power required to achieve that volume, and the bandwidth that speaker is capable of covering - all pretty basic physics. Peter Wieck Melrose Park, PA __________________ My own fifty year of non-professional audiophile experience certainly agrees with Peter's comments. Ed Presson |
#6
Posted to rec.audio.high-end
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Apple HomePod measurements
On 12 Feb 2018 19:14:21 GMT, -dsr-
wrote: I cannot vouch for the accuracy of these measurements, since I had no part in them. I am just relaying this article to you since it might well be interesting. https://www.reddit.com/r/audiophile/...e_perspective/ TL;DR: Room correction forces a rather small speaker "All the way from 40Hz to 20,000Hz it's ±3dB, and from 60Hz to 13.5Khz, it's less than ±1dB" -dsr- Great, but I don't see any specs for stereo separation. I guess you could always buy two :-) |
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