Bel Canto Design eOne uLinkPrice: $675

Website: www.belcantodesign.com

Sathyan said: For those who like to play digital music files on computers, Bel Canto Design’s e.One uLink is a worthwhile upgrade, allowing bit-perfect reproduction of tracks sampled above 96kHz. For those with DACs lacking USB inputs, the uLink provides an easy and musical way of adding computer-based audio to a system.

Read the SoundStage! Hi-Fi review.

The gist: Make your old DAC new again with great-sounding USB connectivity.