as it stands, there are three parallel circuits, one for each speaker, and tuned circuits
(some combination of the 3 types) to allow certain frequencies and prevent others.
the middle circuit has high and low passes to reject higher (that then allows the tweeter
to work) and reject lower (that then allows the woofer parallel circuit to work woofer frequencies)
since there's ambiguity as to the posted parts/schematic, the woofer seems to be
limited by the driver and not the network (and of course, this completely changes
with the addition of pnly one single component).
again, as it stands, it's somewhat elegant (and inexpensive) but it allows substitutions in case
the drivers get blown as long as the driver/cabinet parameters are understood.
more bass? as others have mentioned a subwoofer is mandatory
but me being the sceptic, I'd recommend you have a friend, a meter, and a test tone
generator (and an lp/cd with lots of pink/white noise tracks). the friend moves, tilts, orients
the speakers to eliminate bass-type standing waves from lowering the bass output,
you may be 6 inches away from magnificent window-rattling, chest compressions worthy
of CPR, (or you might need them if its DSOTM), and one of my favorites is the opening
scenes from Top Gun.
enjoy the music