- Written by John E. Johnson, Jr.
- Published on 22 May 2014
The Wireworld Platinum Eclipse 7 XLR Balanced Interconnects On the Bench
Here is where you can see the major difference in the two cables. XLR cables have three conductors, connected to pins 1, 2, and 3 as shown in the following diagram.
Pin 1 is ground. Pin 2 is the + leg of the signal, and pin 3 is the - leg. I measured the reactive impedance for pins 1 and 2, as well as pins 2 and 3.
First, the Pro cable. The Impedance-Phase plot is shown below for pins 1 and 2 (the + vs. the ground). The impedance is 4.4 ohms
For pins 2 and 3 (the + vs. the -), the impedance is 6 ohms.
Now, the Wireworld. First, pins 1 and 2. The impedance is 0.4 ohms, a factor of 10 less than with the Pro cable.
For pins 2 and 3, the impedance is 0.45 ohms, a factor of more than 10 lower than the Pro cable.
Here is the same graph, but with a reduced scale so you can see the exact reading for the impedance. The phase varies more with the Wireworld, because a slight impedance rise at the high frequencies that is present for both cables, has a greater effect when the impedance is low. However, at an impedance of 0.45 ohms, this change in the phase is insignificant.