Audio Cables

Marc Audio Red Line (Signature) and Black Line (Reference) RCA Interconnects and Red Line Speaker Cables


Marc Audio Red Line Speaker Cables

The Red Line speaker cables are configured as tightly twisted 8 gauge conductors, and are priced at $319 for an 8 foot pair. Termination is a stackable banana plug, although I don't know of a use for that stacking capability. However, what is definitely useful is that when you turn the rear end of plug where the hole is located, this loosens or tightens the pressure of the banana plug in the speaker binding post. That is a very nice feature that prevents the plug from falling out of the binding post, which banana plugs tend to do when you move the cables around.

I tested the speaker cables using the same setup as I did originally with the Red Line interconnects. I compared them to one of my reference cables (Cable "X") which is a 15 foot pair (the MSRP for a 2.5 meter pair is $8,500).

Again, as with the interconnects, I could hear no difference between the Marc Audio and Cable "X". Now, I do have to say that I can hear a difference when I use garden variety lamp cord as speaker cables. The highs tend to roll off. In fact, that is how I got into starting Secrets of Home Theater and High Fidelity. I had been using 12 gauge lamp cord for speaker cables, and I swapped in some inexpensive, but well engineered, audio cable. All of a sudden, the high frequencies were there. I hadn't known they were missing until I put in those nice audio cables.

Anyway, back to the here and now.

On the Bench

Below is an Impedance/Phase plot for the Marc Audio Red Line Speaker Cables. The Impedance/Phase plot for Cable "X" is shown in the second graph below. We can't compare the graphs directly, because the lengths were different, but one would assume that the rise in impedance and phase in the high frequencies for Cable "X" would hit the 20 kHz mark at about half way where they did with an 8 foot cable compared to the 15 foot cables. That places the impedance at 0.12 ohms. The Marc Audio cable impedance at 20 kHz was 0.09 ohms, and I consider this difference to be insignificant.

The phase plots for the two cables were very different. Whereas the phase of Cable "X" was near 00 up to about 100 Hz and then rose to 760 at 20 kHz (we could assume it would be about half that with an 8 foot cable), the Marc Audio started out with a high phase and then leveled off to about 800. Although they were different, the variation (taking into account the different length) was about the same. I am not sure what to make of this, other than I did not notice any audible differences between the two cables, and that the sound was excellent.