@QuickSticks
Lots to read about, if you are curious…
Just use search terms “Z Foil” or “Airplugs” and read the many discussions - relating to Naim SuperLine cartridge loading and use of Naim Z Foil Airplugs - on the forum.
The loading plugs in the SuperLine box are good enough. No problem.
The term " Z Foil " refers to a type of electronic component, considered to be higher or highest quality.
Naim hand build a series of SuperLine Airplugs, with these Z Foil components, as higher quality alternatives to the standard ones supplied in the box with their SuperLine. You can purchase these through a Naim Dealer. In our case, Tony @BasicallySound arranged this for us.
** Useful resource, with photo’s of inside of a loading plug.
[ Individual components - resistive ( resistor) or capacitive (capacitor) - for cartridge loading ]
Many report a small gain (in sound quality) from using the Airplugs.
Maybe don’t buy a whole set, just the two or three you feel you might use.
Hope that helps explain?
Good luck
R
edit ** : added a link - a previous post - to show inside an Airplug and a single Z-Foil component, for cartridge loading.