BIS Audio PowerBIS Maestro A/C Power Bar + AC20WG A/C Power Cord Review

2019-02-05T19:37:41+00:00January 3rd, 2019|Cables, Home, Power Conditioning Gear, Reviews|1 Comment

General Sonic Impressions
After testing the Maestro PowerBIS + AC20WG cord combo in a half-dozen 2-channel systems, I found that it sounded remarkably neutral. Other than consistently improving the dynamics and clarity of every system that I powered it with, BIS’ A/C combo imparted no sonic anomalies. The Maestro PowerBIS + AC-20WG combo was more neutral than Switzerland during WW2. If a system sounded harsh or bright, BIS’ power products only delivered more of that fatiguing edge, grain, and/or brightness. Hearing the true sonic character of your system isn’t always a good thing. Sonic truth is a lot like poetry: and most people freakin’ hate poetry.

Sonic Comparisons
Installing a $30 level WallyMaart plastic A/C power bar into my 6-figure all tube 2-channel system resulted in horribly bad — even physically painful — sound. The attack, sustain, and decay of individual notes was slow and incoherent. High frequency instruments like cymbals sounded thin and annoying.

Listening to operatic music, mid-range sonics were compressed, flattened, and smothered like an elephant was sitting on the chest of the lead soprano. Soundstaging and imaging evaporated faster than one of fluffy Trudeau’s election promises. Notes in the lower mid-range, upper bass, and mid-bass were as homogenized as 18% cream. PRaT was unrecognizably bad.

The $30 plastic A/C power bar made more noise than a caffeinated kindergarten class. Overall, using a cheap generic A/C power bar caused my main 2-channel system to sound horrible. I almost herniated myself in the rush to re-install the BIS Maestro power bar + AC-20WG cord.

Against various A/C power conditioners and regenerators in the $3K to $6K retail price range, the BIS combo didn’t quite have the resolution, soundstaging and imaging, PRaT, and timbral accuracy of the other units. The sound quality of the BIS combo was, however, much closer than I expected it to be. In entry-level sub-$5K systems, BIS’ products dramatically improved the sonics of all types of music.

Achieving “realism” from recorded music isn’t easy. And yet, when you hear lifelike sound, listening to music magically becomes an experience that evokes an emotional response. A listener suddenly feels the emotions — the energy, the anger, the sadness… the emotion — of the music.

BIS’ Maestro uses top shelf Wattgate receptacles, has no on/off switch, no pilot lamp, and no filters that kill dynamics, PRaT, and the life of recorded music. By audiophile standards, its stellar performance and impressive neutrality belies its bargain price. The sound quality of these A/C products punches WAY above their price points.

Listening Tests
Released in 2011, the Japanese K2HD CD version of Tom Jones’ The Golden Hits is a treasure trove of his triumphant singing.

During the 1970s, Tom Jones was a God walking amongst men. On songs like “I’m Coming Home”, “What’s New Pussycat”, “It’s Not Unusual”, “Detroit City”, and “Delilah”, Jones sings with a swaggering machismo that could — and often did — stun a lot of marginally inebriated cougars at 20 paces.

Jones was the finest male pop music crooner of his era. And listening to him with the BIS combo powering my 2-channel headphone system, it was easy to understand why so many women threw hotel room keys onto whatever stage Jones was commanding.

This man could sing like he’d descended from Mount Olympus and was every staggering inch an immortal God. The BIS power combo made his voice sound so remarkably correct that I found the timbre, pitch, and dynamic capacity of his singing to be… frightening. Frankly, if you don’t like Tom Jones’ singing, you’re (probably) a God-damned communist who has no soul.

Wanting to hear how the BIS combo sounded with far faster and heavier music, I next tried Black Sabbath’s Born Again. Released in 1983, this master-crafted album features the songs “Trashed”, “Zero the Hero”, “Digital Bitch”, and “Born Again”.

Even on the slower and more emotionally expressive tracks, the songs on this disc are all cement-mixer heavy and more intense than an enraged rhino on LSD.

With BIS’ A/C combo, the spine-shaking intensity of Ian Gillan’s voice — (yes… THAT Ian Gillan from Deep Purple) — sounded as terrifying, and concurrently exhilarating, as I’ve ever heard it. Tony Iommi’s lead guitar solos and Gillan’s high-pitched falsetto shrieks all sounded accurate. Mid-range timbres were a pleasure to sink into. Sounds in the lower mid-range, upper bass, and mid-bass registers had remarkably accurate PRaT, texture, and electrifying dynamics. Overall, BIS’ Maestro imparted zero edge, grain, or sonic artifice.

And hearing Born Again recreated with such palpable energy and musical authority took my mind right back to various vainglorious times in my life when this classic Sabbath record had been a daily staple in my musical diet. Yep… goosebumps; they came to me in shivering waves.

BIS Audio’s Maestro power bar and AC-20WG power cord is the most neutral sounding A/C power combo that I’ve ever heard. If you want to hear more of the sound that your audio system is capable of producing, BIS’ A/C products will bring you far higher fidelity at, by audiophile standards, a bargain price. How good is the PowerBIS Maestro and AC20WG combo? It certainly gets my thumbs up! Individually, the PowerBIS Maestro power bar retails for $1,099 US and the AC-20WG power cord retails for $579 US. But you can buy them as a combo for $1,588 US (which will save you about 7%).

BIS Audio

BIS Audio PowerBIS Maestro power bar: $1,099 US
BIS Audio AC-20WG power cord: $579 US
When purchased as a combo: $1,588 US

  • About the Author:

    One Comment

    1. […] The Maestro Power bar kit with the AC20WG power cord (pictured above), which we recently reviewed (and loved) at the NOVO magazine.  Check out our review here! […]

    Leave A Comment