For $345? What a load of shyte!
That impedance graph shows no values- it's useless and it doesn't show the impedance for the whole speaker system and crossover.
"These filter noise that rides in the musical signal Before it enters your Loudspeaker, and with No possible negative effects in any way."
So, it's a Zobel network AND a noise filter? Interesting. BS.
New? No. This was designed and written about by Otto Zobel, at Bell Labs in 1923.