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Apple HomePod measurements



 
 
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  #1  
Old February 12th 18, 07:14 PM posted to rec.audio.high-end
-dsr-
external usenet poster
 
Posts: 7
Default 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-
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  #2  
Old February 15th 18, 12:34 PM posted to rec.audio.high-end
~misfit~[_3_]
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Posts: 65
Default 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  
Old February 19th 18, 11:56 AM posted to rec.audio.high-end
[email protected]
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Posts: 4
Default 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 :-)
  #4  
Old February 19th 18, 12:38 PM posted to rec.audio.high-end
-dsr-
external usenet poster
 
Posts: 7
Default 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 doesn’t try to
over emphasize the lows, mids, or highs. This is both ideal, and
impressive because it allows the HomePod to accurately reproduce audio
that’s 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.
  #5  
Old February 22nd 18, 05:19 PM posted to rec.audio.high-end
Peter Wieck
external usenet poster
 
Posts: 2,418
Default 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
  #6  
Old February 22nd 18, 08:03 PM posted to rec.audio.high-end
Ed Presson[_2_]
external usenet poster
 
Posts: 31
Default 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


 




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