This general network can be implemented in any of the available filter technologies. In this paper, a few design examples are provided, and a six-pole prototype utilizing compact combline coaxial ...

In the case of a hi-fi set-up, you'll be looking at analogue interconnects, speaker cables and, potentially, a digital optical or coaxial cable depending on the sources you're using. So you'll want to ...

All of these will need to be connected feedline of some sort, and in the likely event you reach for some 50-ohm coax cable you’ll also need a balun to reduce noise or unwanted radiation.