Powerline Accessory Reviews

In the rural home in Cherry Valley, NY that my family and I inhabited from 2003 to 2017, we had dirty water but clean electricity. Evidence of the latter was seen in the results of tests performed by a technician from the local utility, National Grid—I told him I intended to do commercial sound recording on site, which was close enough to the truth that I considered my sin venal rather than mortal—and heard in the sound of my playback system, which rejected as superfluous or worse all of the AC-conditioning products I tried there.

She responds as expected to the only sound: hysterical voices!—Brian Eno

It's a simple premise: power corrupts. You can buy the finest audio components in the world, but if the foundation of your aural house is rotten, you won't get anything vaguely resembling the level of performance your gear was designed to provide. Over time, I've come to realize just how fragile the audio signal chain is, dependent as it is on electrical sources fatally compromised by all manner of aural schmutz pouring through the local grid. I've become obsessed with figuring out how to liberate my system from the line noise, reactive loads, and voltage anomalies that veil the presentation, obscure resolution, and limit dynamic range.

As a longtime user of Nordost's cable and AC-power products, my ears opened wide when they released their three QKore Ground Units and QKore Wire at High End 2017, in Munich. While I've never questioned the importance of proper electrical grounding, to prevent problems with safety and noise—the latter including measurable noise generated by transformers, appliances, LED lighting, power supplies, and Bluetooth, WiFi, and cellular devices—I couldn't fathom what difference a passive grounding device might make in a high-end system that, in my case, is fed by an 8-gauge dedicated line with its own copper ground rod driven into the terra infirma of the fault-ridden Pacific Northwest.

When I reviewed PS Audio's PerfectWave P10 Power Plant AC Regenerator,1 I found that it significantly improved the way music sounded through my system. I bought one. The main limitations I found with the P10 were its power—a maximum continuous load of 1200 volt-amps (VA, footnote 1)—and the number of AC outlets it provides: 10. When driving a 4 ohm load at even half its rated power, one PS Audio BHK 300 monoblock consumes 800W—and while 10 outlets sounds like a lot, I've run out more than once.

Stereophile hasn't reviewed a PS Audio power regenerator since February 2009, when Robert Deutsch tried the company's then-flagship, the Power Plant Premier ($2195). But earlier this year, as I prepared to write my review of PS Audio's NuWave DSD DAC (published in the May 2016 issue), a perfect opportunity to revisit the line came about: I read, in the owner's manual for the PSA DAC, that "power conditioners and the quality of the AC power can make a significant difference in sound quality." Eager to help the NuWave DSD put its best foot forward, I asked PS Audio to assist me in dealing with my AC power, which is marginal here in crowded New York City. They sent me their PerfectWave P10 Power Plant AC Regenerator ($4999)—and John Atkinson asked me to spill some ink on this most recent of the company's clean-power flagships.