You're right that you can do DSP everywhere, but if you implement this in user space you give everybody rights to damage the speaker. It's not only useful for

You're right that you can do DSP everywhere, but if you implement this in user space you give everybody rights to damage the speaker. It's not only useful for tiny speakers: everything from home audio to big PA installations for concert halls can benefit from DSP optimisations. It's a way to squeeze more sound from the same speakers.