Power Cord Length


Here's one for the electric wizards to kick around. Whilst attending Axpona this weekend I was doing some power cord shopping. At one particular display I was being told by a very well known cable company representative, I'll not mention the name so it doesn't influence any responses, that the rule of thumb is that in order for the pwr cord to be effective it needs to be at least five feet long. This allows the current to be in the cord long enough for it to be effective. Ok, I'm really dumb when it comes to this sort of thing so maybe I said that in the most simpliest of words but that's pretty much how it was explained. Anyone care to elaborate on this good or bad?
jackcoke

Showing 2 responses by mazur

For a second there I thought this was one of those April Fool's postings, but soon realized that it's already April 22nd.  Seriously?? Power cord length??

Let's see:  the power generating plant is probably hundreds if not thousands of miles from your amp, the local sub-station definitely a few tens of miles, the wiring from the transformer in your street to the outlet probably a few hundred feet ... and you are worried, and people are seriously discussing, power cord length?  And after you connect the power cord, you still have to deal with all that pesky wire in the primary and secondary of the power transformer, which is just the size and length required by the amp.

So, the experienced and very knowledgeable electrical engineers at Krell build a $40,000 amp and it comes with a power cord that they tested and know it is absolutely perfect for the amp.  Then some sales rep from an audiophile cable company tells you:  they're idiots.  Use my $10,000 power cord!! (which is mot likely worse than the one Krell sent you, and probably a fire hazard).  I'm an electrical engineer and this whole discussion of cables and specially power cords and power connectors really insults my intelligence.

Let's say you're in a Supercar forum and just bought a Bugatti Veyron.  There is a company, or someone in the forum, claiming that you should ditch the original fuel line from the gas tank to the engine and buy their improved super duper fuel line for just $60,000.  They claim that will make the engine run smoother and you will feel the improvement in the horse power of the engine.  Pretty ludicrous, isn't it?

Just use the power cord that came with your amp.

 
It must also be said that many designers are not going to give away their particular paradigm or trade secret while others do have white papers and measurements galore it is a complex issue. Ultimately it is your own listening judgement and I urge you to try experimenting. The relatively inexpensive DH Labs bulk DIY cable is a great place to start.


No, it's not a complex issue.  A power cord is a very simple issue. Building an actual power amplifier IS a complex issue.  Power cords, speaker cables, etc. are not complex at all.

What is really complex is our brains and the physiology of our acoustic system and perception.  Every time I have a couple of beers my system sounds so much better.