[JohnBooty]

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-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

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]

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

[JohnBooty]

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-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.

[Cthulhu_]

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.