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I was a little surprised to see not one but two huge fans. Reviewers have mentioned hearing no fan noise, but maybe they crank up a little if you really push th

by TillE 3y ago

I was a little surprised to see not one but two huge fans. Reviewers have mentioned hearing no fan noise, but maybe they crank up a little if you really push the GPU + CPU with a 3D game.

rowanG077 3y ago
Probably precisely why they use two fans. Have them really silently instead of one audibly.
- georgemcbay 3y ago
  Also probably why they are relatively big for a device of this size. If you're designing for a specific airflow target, making the fans larger lets you make them quieter because they can spin slower than smaller fans while displacing the same amount of air.
- deleted 3y ago
  [deleted]
- easeout 3y ago
  That and there are two major chips, the R1 and M2, acting as distinct heat sources. I don't know if they would spin the fans up and down independently, but the two chips' heat output could differ over time.
coffeebeqn 3y ago
Any PC builder can tell you that the bigger and more fans you get the quieter and slower rpm they can run
- polyomino 3y ago
  But also more weight
MBCook 3y ago
Someone managed to get a mention of them out of someone at Apple a while ago. Not only are they quiet, but the EarPods (built in headphones) do active noise cancellation against them for the person wearing the Vision Pro.
- perryizgr8 3y ago
  I don't think it is possible to do open air noise cancelation like that. Do you remember where you saw that mentioned?
  - ralph84 3y ago
    Why not? There are active noise cancellation systems for airplanes and cars where the distance between the speaker and the ear is much greater than in this case.
    - perryizgr8 3y ago
      As I understand it, niose cancelation requires an enclosed volume of space. It's why you never see it on open back headphones. Cars and aeroplanes are completely enclosed too.
      - wtallis 3y ago
        Active noise cancellation is just destructive interference. It doesn't fundamentally require any sounds to be bouncing off surfaces, and mechanical isolation would be passive noise cancellation. The main caveat to active noise cancellation is that you cannot construct a destructive interference pattern that cancels the noise everywhere. Creating destructive interference to cancel out the noise at your ears will unavoidably mean creating constructive interference somewhere else.
      - kiicia 3y ago
        see galaxy buds live, the only limitation is that active noise cancellation works up to certain frequency when passive cancellation must take over

by TillE 3y ago

I was a little surprised to see not one but two huge fans. Reviewers have mentioned hearing no fan noise, but maybe they crank up a little if you really push the GPU + CPU with a 3D game.

rowanG077 3y ago

Probably precisely why they use two fans. Have them really silently instead of one audibly.

georgemcbay 3y ago
Also probably why they are relatively big for a device of this size. If you're designing for a specific airflow target, making the fans larger lets you make them quieter because they can spin slower than smaller fans while displacing the same amount of air.
deleted 3y ago
[deleted]
easeout 3y ago
That and there are two major chips, the R1 and M2, acting as distinct heat sources. I don't know if they would spin the fans up and down independently, but the two chips' heat output could differ over time.

coffeebeqn 3y ago

Any PC builder can tell you that the bigger and more fans you get the quieter and slower rpm they can run

polyomino 3y ago
But also more weight

MBCook 3y ago

Someone managed to get a mention of them out of someone at Apple a while ago. Not only are they quiet, but the EarPods (built in headphones) do active noise cancellation against them for the person wearing the Vision Pro.

perryizgr8 3y ago
I don't think it is possible to do open air noise cancelation like that. Do you remember where you saw that mentioned?
- ralph84 3y ago
  Why not? There are active noise cancellation systems for airplanes and cars where the distance between the speaker and the ear is much greater than in this case.
  - perryizgr8 3y ago
    As I understand it, niose cancelation requires an enclosed volume of space. It's why you never see it on open back headphones. Cars and aeroplanes are completely enclosed too.
    - wtallis 3y ago
      Active noise cancellation is just destructive interference. It doesn't fundamentally require any sounds to be bouncing off surfaces, and mechanical isolation would be passive noise cancellation. The main caveat to active noise cancellation is that you cannot construct a destructive interference pattern that cancels the noise everywhere. Creating destructive interference to cancel out the noise at your ears will unavoidably mean creating constructive interference somewhere else.
    - kiicia 3y ago
      see galaxy buds live, the only limitation is that active noise cancellation works up to certain frequency when passive cancellation must take over