We’ve underestimated the amount of noise in our system. One impetus for the design of high-performance audio equipment is to mitigate the EMI/RFI noise that may contaminate the audio signal. This applies heavily to analog and digital cables which, without proper geometry and materials, could welcome this distortion with open arms. Of course, this also applies to internal circuitry and power supply.

One unobvious source of noise is improper grounding. A quality power cable works wonders in providing unimpeded current to your devices but some of these devices don’t properly ground their circuit boards to the IEC inlet. In such cases, a high-quality power cable won’t solve this problem. This will result in a higher noise floor in the entire system (it is clearly audible). When the circuit is given a quicker path to mother earth, noise is drained out of the board and fidelity improves. A path of least resistance is key.

There are plenty of passive and active grounding solutions. Many of them allow the grounding of multiple components. Nordost, CAD, Telos, and Entreq come to mind. Nothing’s better than grounding to good ol’ earth so many of these boxes contain a proprietary mix of natural earth minerals that help in eliminating EMI/RFI noise. Unfortunately, the price point of some of these solutions is prohibitively expensive.

I was skeptical better grounding would make an appreciable difference until I heard what the tiny Synergistic Research passive grounding block was able to do for my Chord DAVE via an XLR HD ground cable. Adding another HD USB ground cable to my music server and even more acoustic improvements (lower noise floor, more body, and much more depth).

Curiosity sparked. I was asked by a few readers to review the Canadian Gutwire Perfect and Ultimate ground cables. I got in contact with Herbert Wong of Gutwire and he sent them right over. Gutwire claims that most box solutions will be saturated and will need to be “shaken up” every half year to maintain performance. The Perfect and Ultimate ground cables provide a more plug-n-play approach without further maintenance. You also won’t have to pay quadruple digits for it.

Build, Features, and Setup

  • Gutwire Branded gold-plated RCA with locking barrels
  • Perfect Ground
    • Conductors: Multi-Strand High Purity Oxygen Free Copper
    • Conductor Gauge: 14 AWG X 4
    • Insulation: PVC
    • AC Connector: Leviton, Schuko or UK1363
    • Connector: RCA, Clip, Spade, XLR or 3.5mm
    • Extensive use of natural minerals: Binchō-tan
  • Ultimate Ground
    • Conductors: 100% IACS Pure Copper
      Shield Coverage: Mylar Metallic braid shielding
      Insulation: Air
      AC Connector: Wattgate 5266i, Schuko or UK1363
      Connector: RCA, XLR, Clip, Spade, Banana or 3.5mm
      Extensive use of natural minerals: Rare Earth Element Composition

Gutwire recommends prioritizing upstream components, primarily sources (CD players, DACs, servers, etc). They also recommend a direct connection to the wall and not a power conditioner. if using non-filtered extension outlets, they shouldn’t be sharing the same AC outlet (although they could be on the same circuit).

We had a few extra outlets on the wall so we were able to plug in directly. After some experimentation, the ground cables seem to be most effective our Lumin S1 DAC/streamer and PS Audio BHK Signature preamp. We connected the Gutwire cables to an unused RCA jack on the Lumin S1 for most of our review. Testing the efficacy of these cables was simply a matter of alternating sessions of listening, unplugging, and plugging a single connector. I love stress-free cable tests. I would’ve used it on the DAVE but the RCA (with Purist Audio Design BNC adapter) didn’t seem to have any effect on the sound. Not a huge surprise since I’ve only heard a difference from the XLR inputs (unfortunately, I didn’t have a Gutwire cable with XLR terminations for testing).


Perfect Ground

Without the Perfect Grounding cable in place, there’s a denser sound with fuzzier edges. With the Perfect in place, the music opens up, noise floor drops dramatically, and our ears are greeted with a healthy dose of resolution and dynamics. In comparison to having no Gutwire cables, the sound was less dark, less soft, and more musically dimensional. Articulation, especially of strings, was more produced and tactile. The differences weren’t subtle which is a tad surprising as this is just one cable plugged into an unused RCA port. I’m still amazed at how transformative a single, unassuming cable could be. As opposed to the warmer and thicker sound when not using the Gutwire, the Perfect Ground cable provides a very clean, energetic, fast, and transparent sound field. Overall, I preferred the system with the Perfect Ground in place than without.

Ultimate Ground

We expected slight improvements with the Ultimate Ground but it was a different sound entirely. It takes what we liked without the Perfect (mostly a warmer tone) and what we liked about the Perfect (everything else), and combined them into a tonal gestalt to die for. The midrange is as refined and sweet as ever and the highs weren’t shy. There’s improved tactility and aural nuances that just weren’t audible without the Ultimate Ground in place. Lower mids and bass were authoritative and impactfully taut and precise. To top it off, the focus and soundstage imaging improved to unprecedented levels on this system. It was the difference between listening to a great recording to listening to something so soulful and real, you get drawn in for the entire recording. As a sanity check, I kept swapping back and forth but the upgrade was astoundingly obvious and utterly compelling.

Some listening notes with the Gutwire Ultimate Ground cable:

Stevie Ray Vaughan & Double Trouble – Couldn’t Stand the Weather

  • Improved umph and definition on the kick drum.
  • Guitar riffs are more vivid and refined.
  • Voice is very focused and more tonally weighted (more meat on the bones).

Harry Connick, Jr. – We Are in Love

  • Pitch black quiet background. That twentieth of a second between lines as if to punctuate the previous lines are much more apparent.
  • Just more tonal density across the entire range.  It’s as if you took a strong pencil line and took another pass at it with to reaffirm the separation from the players.

Dick Hyman – Mean to Me

  • More punctuation between each beat played by the drummer
  • Enormous amount of air which helps separate the bandmates in natural fashion
  • A rhymic delight with a convincing acoustic stature throughout. Image size is quite accurate.

Sara Bareilles – Goodbye Yellow Brick Road (Brave Enough: Live at the Variety Playhouse)

  • More pristine vocals and much better separation from piano notes. There’s a denser sense of acoustic independence.
  • Acoustic cues from the venue are properly relayed with proper reverberation and decay. Without the Ground cable, it stops short and is more unnaturally immediate.
  • With the Ultimate Ground I felt there were a delicacy and accuracy to the sound. It didn’t sound contrived or overly impressive, just captivating and musical.

Patricia Barber – Black Magic Woman

  • Rift on the guitars has a little more twang and excitement.
  • The “whoa”s and claps from the crowd pop out in a startling way.

Edgar Mayer & Chris Thile – Tarnation

  • Noticeable improvement in the decay of the string pulls and plucks.
  • Bass plays with more ferocity and has more incisive texturing resulting from the increased tightness the Ultimate Ground provides. It sounds quite soft, flat, and nonchalant without the Ultimate.

Final Impressions

Both Gutwire Ground cables will lower your noise floor, I guarantee it. I’ve never had a single component lower the noise floor this significantly (especially at this price). The Perfect Ground will elevate your system immediately. From a value perspective, it reminds me of the High Fidelity Cable MC-0.5s and Synergistic Research BLACK fuses. Admittedly completely different components but I personally feel the Ultimate Ground is an even better value overall.

The best way I could describe the Ultimate Ground it is probably “weighted energy.” Voices and instruments have a distributed acoustic weight that doesn’t disturb other players but form a harmonious and palpable presence. It’s has a natural density yet maintains a proper amount of body to be musically convincing throughout the entire soundscape. I hear no downsides to the having the Ultimate Ground cable in the chain…at all.

The stark differences with and without the Ground cables will get you thinking about what to really prioritize in your system and where to allocate funds. Luckily for you, the Gutwire cables are affordable. The only gripe I have is its unwieldy nature of the Ultimate, especially if you are to ground multiple components. The Perfect Ground isn’t extraordinarily thick and will work for most. Given its performance, I’m sure people will find a way to make it work.

I’m appalled at how a non-signal carrying cable could improve the sound this dramatically. If anything, I think the Gutwire Ground cables speaks volumes about the importance of grounding. The improvements are not incremental to my ears as I’ve determined the Gutwire Ground cables to be a necessity in our system. Check out these prices!

The Gutwire Ultimate Ground will be receiving our Finest Cuts award.