Ayre Acoustics QB-9DSDPrice: $3495

Website: www.ayre.com

Colin said: When a component raises the bar as much as the QB-9DSD did in my system, I think I’d sell a kidney to keep it. So far that hasn’t proved necessary, and at the $700 upgrade price I won’t have to sell even an eyelash.

Reviewers' Choice

Read the SoundStage! Hi-Fi review.

The gist: One of the original USB DACs gets a makeover.