Price: $4000

Website: www.shunyata.com

Doug said: If you’ve already done all you can to improve the delivery of power to your audio system -- e.g., by installing dedicated lines -- the Denali D6000/S is one of a very small number of power products I strongly recommend that you try.

Read the SoundStage! Hi-Fi review.

The gist: Made a small but important improvement to the sound of Doug’s system.