Bowers & Wilkins 707 S2

The Bowers & Wilkins 707 S2 speaker looks stunning and sounds highly detailed, but it's best as a surround or paired with certain kinds of music

When it comes to building speakers there are only so many materials manufacturers can use to construct their drivers -- paper, kevlar and aluminum are popular options. And then there's Bowers & Wilkins, the storied speaker brand known for such audiophile-grade gear as the legendary Nautilus and the D805 series speakers, which use actual diamonds in their tweeters.