http://www.empiricalaudio.com/computer-audio/technical-papers/myths-and-snake-oilThe reality is that a power cord made from 12-14 gauge solid copper is pretty good. The problem with this is that this wire is not UL approved for cords and is very inflexible indeed. Most electrical Romex runs to the outlet in question are 20-40 feet in length. The power cord adds an additional 6 feet or so, so this is a small percentage of the entire run. It turns out that typical "rubber" stranded copper power cords have significantly higher inductance than the Romex in the wall, even at the same wire gauge, so these are not recommended. Empirically, stranded rubber cords have been demonstrated to limit transient high-power currents (dynamics) compared to solid copper conductors when supplying power to typical audio power amplifiers.
It is fairly easy to build a serviceable cable that will minimize power cord inductance. A simple 3-conductor twisted cable from 12 AWG solid THHN from Home Depot yields a very high quality power cord, although it is so stiff that it must be bent to the desired shape. It is actually superior to the Romex in the wall because the twisting and close proximity of the insulated conductors will reduce the inductance by magnetic coupling between the conductors. In the optimum configuration, the Hot and Neutral are twisted together and then the ground wire run beside or wrapped around them. The trick is to design a flexible version of this cord with the same characteristics. This is why some of the expensive cords are actually good designs, although more than $500 is unreasonable to achieve a good design.
Romex to your amp?
One of my good friends, a non-aphile, asked me an interesting question...
I was discussing with him why my new pc made a nice improvement in my SQ.
So he asked me this question:
Why not take the Romex all the way from the wall and connect it to the amp...instead of
using an after market pc? His logic was that the in-wall cable is Romex and therefore a straight run to the power amp would be better ( or at least as good) as a break at the wall plug and an after market pc to the amp. Does he have a point??
I was discussing with him why my new pc made a nice improvement in my SQ.
So he asked me this question:
Why not take the Romex all the way from the wall and connect it to the amp...instead of
using an after market pc? His logic was that the in-wall cable is Romex and therefore a straight run to the power amp would be better ( or at least as good) as a break at the wall plug and an after market pc to the amp. Does he have a point??
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- 46 posts total
- 46 posts total