Walker Audio- High Definition Links- anyone

So, does anyone know how or why they work? Based on how they are connected it seems that this is some kind of passive filter.

I have 5 pair of these in my HT setup. I have two (pair) on my center and voices cleared up a lot. These are very good everywhere in the room. Some setups my need more then one pair. THats happened in my room.

I've been using them for years, As above, put them on, you'll like the improvement , take them off for a listen and it'll be brief, they go back on. More natural, less extraneous "stuff". Well worth it.

The only thing that makes sense to me is that it could be a Zobel network.

http://www.trueaudio.com/st_zobel.htm

I would think a Zobel would imply some type of impedance correction and I can't see how that could be universally applied. Walker's site mentions "very high frequency electronic noises" and RFI. I'm still guessing that it is a low pass filter up around the neighborhood of 20kHz.