It's just marketing to exploit people who don't know any better. They've obviously chosen the term "HD" because people are aware of the superiority of a HD image compared to an SD one and some people will make the same comparison between "HD" and "SD" sound in their minds, even if there is no comparison to be made because the term has no meaning when applied to audio.
They're trying to build a premium brand using snake oil salesman tactics and some people fall for it. When people have paid over the odds for something, they often don't want to admit that they've been had, even if they eventually realise that they have been. Others are just innocent "victims" and are basically conned into buying things like $150 HDMI cables by salesman who are lying to them as they're on commission.
I would never buy anything from Monster. Lots of companies tell white lies and bend the truth with iffy marketing terminology ("retina display"? Fuck off!), but Monster are full on Billy Bullshitters.

Bookmarks