It had been a while since I'd done any serious, critical listening through headphones. That changed when Editor Jim Austin asked if I wanted to review the iFi Audio ZEN Signature Set ($599). Figuring I could use more Zen in my life, I agreed.

UK-based iFi Audio, which operates under the auspices of the Abbington Global Group, has released several compact products in its ZEN series: DACs, headphone amps, a Bluetooth receiver, and a network streamer.