Advanced Passive Xover circuits

Hello all,
i cant understand what exactly those ciruits (R3/R5/R4 and R6) are. These are above my low passive xover circuits knowledge.
I see a impedance peak circuit LCR, i see a bandpass second order. but what do those R values ?
It looks like that each of the first part of the second order xover in the bandpass was combined to an Contour Network Circuit (RC/RL>R5 and R3 up/down)
is that correct ?
And for the R4 and R6 i have no clue what kind of combined circuit this is.
Anyone able to enlighten me ?
Unbenannt.JPG