As its downward-facing deep bass driver, or woofer, emits several test tones, an onboard microphone at the bottom of the speaker picks them up.
I think we need to look at what some of the deeper drivers are of this volatile, uncertain, new global context, which Davos has as its theme this year.
If there's a deep driver of the gender gap, it's usually views about spending and the role of government.
"The mobile business, like services in general, benefits from two deep drivers of change that are especially important in Africa - population growth and urbanisation," says Francois Conradie, an economist at NKC in South Africa.
Many multimedia "subwoofers" might better be termed "bass drivers" as they are too small to produce deep bass.
It was a profoundly shocking moment for Hill, who would come to be widely regarded as one of the most intelligent and deep-thinking drivers of his generation, and he subsequently seemed to wrestle within himself as to whether or not winning the world championship had been quite worth the effort in such emotionally fraught conditions.
He took a breath so deep that the driver glanced up again when he let it out.
(Chip Stern, a cabdriver, recently wrote in Taxi Insider, "The 'story' has snowballed into a hill of beans, as the T.L.C. subsequently sought to bury all cab drivers deeper than dinosaur shit").
One type of countermeasure, active safety systems, requires a deep understanding of driver behaviour to be effective without being annoying.
Those issues seem like they should be fixable, but there are deeper tensions with drivers who are upset about their lack of job security if they get a poor rating and declining fare revenue.
