no guarantee of filtering out all HF
An electrical engineer on how power cables can impact sound quality
Sharing an fascinating discussion of how the design of power cables can impact sound quality of an audio system from an electrical engineer that does analog design for audio equipment.
The HiFi Podcast with Darren and Duncan / Radio Frequency: The 800MHz Gorilla
The discussion of how power cables can impact sound quality starts at 80 minutes into the podcast
From the Podcast:
"If you have an engineering degree and you’re hearing this and you’re shaking your head and you’re saying this is nonsense, my response to you is that you’re logical. Based on what you have learned, I completely understand your response, but unfortunately, the way that power cables operate is not the way that we were taught in electrical engineering necessarily."
"Power cables were always thought of as series devices. If we add this 2 meter power cable to 2 miles of powerline, why does this 2 meter power cable make a difference?"
An intro into the theory behind why power cables work from the podcast:
"The power cable is not necessarily a series element of a system. The parallel elements [of a power cable] and way they interact with RF in the room in a common mode sense to ground is incredibly important." [Meaning in parallel to ground]
My paraphrase of the rest of the discussion. They get into far more detail: The configuration and materials used in a power cable matter because they affect a cable’s capacitance which in turn changes the cable’s impedance. Most importantly, the change in impedance impacts electrical signal differently across the frequency spectrum.
Two ways to get more details on this:
- Listen to the podcast starting at 80 minutes into the podcast. The discussion of how a cable's design impacts its ability to shunt RF to ground starts right there.
- Send a question to the hosts of The Hi Fi Podcast. You can find their email on their website.
Credentials of the creators of The Hi Fi Podcast:
Darren:
Darren is the designer of many products for Boulder’s PS Audio brand, most recently known for Stereophile’s choice as the 2020 “Analog Component of the Year,” the PS Audio Stellar Phono preamplifier, and the incredibly well-reviewed new Stellar M1200 tube hybrid mono amplifiers.
With a career as an analog and digital circuit designer spanning two countries and several of the most well-known brands, Darren brings much experience to the table. He earned his EE and worked for both Bowers & Wilkins and Classe Audio before coming to Colorado, and also, before turning 30.
He is the designer of the PS Audio Stellar Phono phono preamp
Duncan:
Duncan has recorded 150+ bands, has published 450+ articles, columns and blogs and is an experienced DIYer when it comes to audio equipment and speakers. He met Darren when working as the Retail Sales Manager of Boulder’s PS Audio, and the two collaborated on an audiophile recording and concert series called “Invisible Audience,” not to mention the weekly hikes in the mountains. He is a mastering engineer, cable designer and musician, avid fly fisherman, bike polo enthusiast, husband and dad in his “free time.”
But what truly gives him a useful perspective for the podcast is his day job as a testing technician for the world’s largest online re-seller of high end audio, The Music Room. Over years in this role, he has listened to and evaluated thousands of the finest products from all over the industry and throughout high end audio’s extensive history.
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So the often maligned audioquest DBS system may not be bunk after all? I like what my audioquest Thunder power cable does. It seems to increase (slightly) the dynamics of my system. It also seems more quiet. I use it in combination with other audioquest power devices, which include the Niagara 1200 and the Edison receptacle. So, maybe the cable is doing nothing, or in combination with the other stuff it is....I don’t have enough time to determine. I’ll just say I’m not too worried about my power now, so maybe all I really have is placebo effect and some protection from surges and a bit cleaner power, who knows. Crazy to think that the money spent on just the cables and the power conditioner etc...are enough to put together a nice budget system that most sane people would live happily ever after with.....🙄 |
@audioguy85 Vandersteen power amps have 128 volt DBS for good reason :-) Enjoy your great cables ! Jim |
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- 128 posts total