Alpha Core Goertz

I thought the Zobels were for 10 foot or greater lengths and used with certain tube amplification?.

@jacobsdad2000 Probably not. Tube amps are not likely to go into oscillation and blow up as spectacularly as we used to see with solid state amps made in the 1970s and 80s sans ZOBEL networks, when subjected to a highly capacitive speaker cable. That lesson was not ignored so many solid state designs have them built in (and the more competent ones from the 70s and 80s did too).

But high end audio can sometimes be a bit of the Wild West and the design school of By Gosh and By Golly, so if you have a solid state amp from a smaller manufacturer its at least worth a phone call to see if the ZOBEL network might save a trip back to the manufacturer for repairs.

Is it possible the Goertz cables already have the Zobel’s installed internally, and I just may be adding a second set?

No. But its very possible that a ZOBEL network is inside your amp!

The issue here is that the Goertz cables have high capacitance. If connected to an amplifier with a poorly designed feedback loop, the result can be an oscillation that can damage the amp (and probably a tweeter) in very short order. This was a much bigger problem in the 1970s and early 80s. But just because an amp was made in the 21st century does not guarantee its immunity; its best to check with the amp manufacturer to be sure there isn't a problem. The ZOBEL network may or may not help (but won't harm) depending on the amplifier's design.