iPad Pro New iPad Pro 12.9 bad sound quality

Discussion in 'iPad' started by jenss, Jun 15, 2017.

  1. jenss, Jun 15, 2017
    Last edited: Jun 17, 2017

    jenss macrumors newbie

    Joined:
    Nov 26, 2008
    #1
    EDIT: I am now certain that the iPad is defective. I will return it. Details in post #8.


    Got the new 12.9 a few days ago. Everything works just fine, except the sound quality is bad in some cases.

    I live in a country with no Apple Store, and I haven't seen it at the local electronics stores yet, so I can't easily go listen to another new 12.9 at the moment.

    The audio problem is a little hard to explain, but I'll try.

    When playing audio through the internal speakers that hit certain frequencies in the lower end, some kind of resonance happens, and the sound is muddy or rattling. Some male voices hit that frequency, and it sounds like the entire iPad is self resonating, making it a little hard to understand what that person says.

    A few songs sound bad too.

    The best example is to find "Jennifer Warnes, Somewhere Somebody" (on e.g. YouTube or just the free preview in iTunes Store) and play it at about 75% volume. It sounds absolutely terrible. Like the speaker unit is rattling around on a glass table. Especially the ending from around 2:38 where she sings "meeeeeeeeee" is nasty.
    That particular track is a very high quality recording that should sound absolutely clear.

    Sounds fine on a 12.9 1st gen and other older iPads. Also sounds fine through headphones.

    Playing at less than ~50% volume is fine. 50% or more is bad.

    Rotating the iPad around makes no difference. Maybe it's a tad better when the home button is on top, but not a big difference.
    If one of the four speaker units in the iPad was defective I would've expected rotation of the iPad to make a difference. This seems more like the speakers are ok, but the whole iPad is resonating.
    Pressing on the screen and/or the back makes no difference.

    Most other songs and videos sound fine.

    Anyone else with a new 12.9 have the same experience?
     
  2. Derude macrumors newbie

    Joined:
    Sep 6, 2013
    #2
    I have the 10.5 iPad Pro and I notice not problems, what I find odd is you say most songs sound fine.. this makes me think it's a quality problem with the stuff your listening to not your IPad.. if songs keep messing up at the same time in certain songs none stop that's not a problem with your speakers
     
  3. Derude macrumors newbie

    Joined:
    Sep 6, 2013
    #3
    If your using your old iPad 12.9 as reference and your using the EXACT same song on both but your new one is still messed then ya something is wrong, I would recommend returning it

    my advice, when your paying that much for a product and there's something wrong with it even if it's something little or even if it's something that happens here and there return it.
     
  4. jenss thread starter macrumors newbie

    Joined:
    Nov 26, 2008
    #4
    I get what you're saying, but when the exact same song or YouTube video sounds fine on other devices, the source material is not at fault.
    --- Post Merged, Jun 15, 2017 ---
    My first thought too. The reason I'm asking is, if every new 12.9 sounds the same, there's no point in exchanging it.
     
  5. Newtons Apple Suspended

    Newtons Apple

    Joined:
    Mar 12, 2014
    Location:
    Jacksonville, Florida
    #5
    As small,as the speakers are and where they are mounted, lower frequencies will not sound that good. Get you a good pair of wireless headphones and the 10.5 rocks!
     
  6. jenss thread starter macrumors newbie

    Joined:
    Nov 26, 2008
    #6
    Yes that is odd. To me it seems like certain frequencies in the audio makes the entire iPad resonate. Those frequencies may not be strongly present in every song or video. A bass heavy piece like for example Scream and Shout with Will I Am sounds just fine.

    Music isn't main problem for me. One specific news presenter has a voice that triggers the resonance constantly. Won't name him to avoid this turning political. Just about every other news presenter sounds just fine.

    Added a short video to original question.
    --- Post Merged, Jun 15, 2017 ---
    Already have some very nice headphones, but they will not solve the problem when several people listen to the iPad at the same time. Was planning to use it for watching the news at breakfast and diner... don't judge me ;-)

    Maybe you are right that the speakers can't sound any better, that's what I'm trying to find out.
     
  7. Relentless Power macrumors G4

    Relentless Power

    Joined:
    Jul 12, 2016
    #7
    The speaker placement I believe is different from the 12.9 iPad Pro, which uses carbon fiber caps. Also, the speakers will be somewhat smaller than the larger iPad Pro. I have heard recent reports where the 10.5 Pro is not as loud as some were expecting.

    Here is a breakdown by iFixit.

    https://forums.macrumors.com/threads/ifixit-shares-10-5-inch-ipad-pro-teardown.2051069/
     
  8. jenss, Jun 17, 2017
    Last edited: Jun 17, 2017

    jenss thread starter macrumors newbie

    Joined:
    Nov 26, 2008
    #8
    I am now certain that the iPad is defective. I will return it.

    I decided to do a science on the problem...
    For the technically interested, here's how I determined that the iPad is defective:

    Before we begin, let me clarify that the main problem is not that the iPad is unable to play a pure sine wave, it's simply the easiest way to illustrate why it sounds awful. All tests are done in a room with acoustically dampened ceiling, and the devices are placed on towels to eliminate rattling.

    When playing back a pure sine wave and comparing the 1st gen and the 2nd gen there's a big difference in clarity.
    Above ~500Hz it sounds ok, but below it sounds awful. Worst case is around 180Hz

    This is a spectrum plot of the 1st gen iPad at full volume, 180Hz sine wave:
    IMG_3118.JPG

    This looks nice and clean with some harmonic distortion, which is fine.

    This is the 2nd gen plot at 75% volume:
    IMG_3117.JPG

    Lots of non harmonic distortion. Not good.

    I have tested all the older iPads I could get near, and they all sound great and produce a spectrum view similar to the 1st one above.

    Video of a direct comparison, 1st gen left, 2nd gen right:


    Next I tested speakers vs. headphone jack on the 2nd gen iPad. The spectrum view is live as illustrated by me making noises:


    It's a little hard to hear the sound from the headphones, but the spectrum view says it all. Headphone out is a clean signal. Speaker output is full of non harmonic distortion.

    Now please direct your attention to 0:32 in this video. The distortion gets worse by itself.

    When playing below ~75% volume, some distortion is present at a constant level. At around 76% volume the distortion increases after 10-15s and again a second later. When lowering the volume, the distortion decreases after a few seconds in two steps.
    At higher volumes the two step increase is significantly faster. Above 90% it happens almost instantly.

    Here's a waterfall view of that phenomenon.
    (Please excuse the crudity of this model. I didn't have time to build it to scale or paint it)
    IMG_0001.JPG

    After restoring through iTunes and setting up as a new device, the problem persisted.
     
  9. Husketch macrumors newbie

    Joined:
    Aug 11, 2017
    #9
    Hello OP!

    I bought an iPad Pro 2nd gen (12.9) and I think the sound isn't really that good..! Did you replace your unit? Let us know if the replacement has better sound quality.
    Thanks
     
  10. jenss thread starter macrumors newbie

    Joined:
    Nov 26, 2008
    #10
    I got a replacement. (Took forever due to the Notpetya malware attack on global shipping).
    Same exact problem.

    I suspect they all have the problem, and I guess I am just more sensitive to that kind of distortion than most people.
    When demonstrating the problem to others, they have a really hard time identifying anything wrong with the sound.
    I am a bit perplexed by that, since I don’t have golden ears or OCD.

    I have chosen to just live with it, since the iPad is so great in every other aspect.

    I really wish that Apple would just implement a systemwide equalizer, so we could dampen the range around 180Hz where the distortion is most pronounced.
     
  11. Husketch, Aug 11, 2017
    Last edited: Aug 11, 2017

    Husketch macrumors newbie

    Joined:
    Aug 11, 2017
    #11

    Thanks for the update jenss!
    It's a pity, but I think it's livable with. Do you think it was a better sound overall on the first gen 12.9 iPad Pros ?
    I will have to find a way to compare it with other models at the Apple store. overall I feel the sound is too 'treble'..
    If your replacement unit has the exact same sound, it's then highly likely they're all like this..
    Thanks for making this thread, this might be a serious issue with Apple sound quality on the new iPads.
     
  12. jenss thread starter macrumors newbie

    Joined:
    Nov 26, 2008
    #12
    Don’t have golden ears, but my take on it is that the 2nd gen plays way louder, and has more bass.
    1st gen has cleaner sound.

    I often use the iPad to listen to podcasts/talk shows, and the 1st gen has better reproduction of voices, but 2nd gen can play louder but with some, not all, voices distorted.

    Despite the sound problem, 2nd gen is still the overall winner for me, compared to 1st gen.
     
  13. rolijen macrumors newbie

    Joined:
    Dec 14, 2011
    Location:
    Milwaukee
    #13
    My 2nd gen iPad Pro 12.9 has the same problem. I love the device, but this crappy audio really bugs me. Serious design flaw. I don't know what to do.
     
  14. uuaschbaer macrumors regular

    uuaschbaer

    Joined:
    Aug 31, 2009
    #14
    I'd like to repeat your sciencing when I get my ipad pro, what apps do you use to produce the sine wave and the frequency spectrum?

    Edit: And out of curiosity, what phone model do you use?
     
  15. Husketch macrumors newbie

    Joined:
    Aug 11, 2017
    #15
    Did you buy it recently? can you compare it at the Apple Store just to make sure it's not just your device, but all have the same sound production?
     

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