Roy Harris has posted a review of the PS Audio PerfectWave PowerBase ($995) at Audiophilia. His conclusions:
“Based upon the initial audition, and removal of one Power Base, I would concur with PS Audio’s statement of purpose, mentioned earlier in this review. Thus, I am convinced that the PowerBase improves dimensionality, dynamics and enhances timbral realism, without altering the frequency response.”
You can read the full review here.