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On a much less impressive (though more acccessible, at least for those of us who don't get to tool around with space telescopes on a regular basis) a similar te

On a much less impressive (though more acccessible, at least for those of us who don't get to tool around with space telescopes on a regular basis) a similar technique is actually pretty common in consumer audio applications. A number of Apple devices employ this technique, like the new iMacs. I know the 2019 (and presumably, the 2021) 16" MBPs do: https://thenextweb.com/news/the-new-imacs-have-force-canceling-speakers-heres-what-that-means https://thenextweb.com/news/the-new-imacs-have-force-canceli... It's popular in higher-end subwoofers. While not the cheapest solution, a whole host of design issues is solved by simply adding a second amplifier and a second driver firing in the other direction. https://us.kef.com/kf92-subwoofer.html https://us.kef.com/kf92-subwoofer.html If I'm not mistaken a fair number of portable Bluetooth speakers use something similar. If you're hearing a surprising amount of rattle-free bass come from a device that seems too small to pull it off, there's a decent chance they're using dual opposed drivers.

grishka 5y ago
Do they use this in the 2021 MacBooks too? The thing sounds almost like it should not be physically possible to pack this much bass into such a thin device. p.s. I'm so tired of random websites blocking Russian IPs because reasons
- Cthulhu_ 5y ago
  I've blocked Russian IPs from my website because the vast majority of spambots had a Russian IP. Anyway yeah, I was already impressed with these little portable speakers.
- JohnBooty 5y ago
  Yeah, it seems the 2021 MBPs use a similar system: "A high-fidelity six-speaker sound system features two tweeters for a clearer soundstage and four force-cancelling woofers, resulting in 80 percent more bass" https://www.apple.com/newsroom/2021/10/apple-unveils-game-changing-macbook-pro/ https://www.apple.com/newsroom/2021/10/apple-unveils-game-ch... I'm not sure what this "80% more bass" claim is in comparison to. But the 2019 models are definitely impressive. I'm looking forward to hearing the 2021 at some point.

grishka 5y ago

Do they use this in the 2021 MacBooks too? The thing sounds almost like it should not be physically possible to pack this much bass into such a thin device. p.s. I'm so tired of random websites blocking Russian IPs because reasons

Cthulhu_ 5y ago
I've blocked Russian IPs from my website because the vast majority of spambots had a Russian IP. Anyway yeah, I was already impressed with these little portable speakers.
JohnBooty 5y ago
Yeah, it seems the 2021 MBPs use a similar system: "A high-fidelity six-speaker sound system features two tweeters for a clearer soundstage and four force-cancelling woofers, resulting in 80 percent more bass" https://www.apple.com/newsroom/2021/10/apple-unveils-game-changing-macbook-pro/ https://www.apple.com/newsroom/2021/10/apple-unveils-game-ch... I'm not sure what this "80% more bass" claim is in comparison to. But the 2019 models are definitely impressive. I'm looking forward to hearing the 2021 at some point.