The weak point with the Athenas is the tweeter, IMO. Crisp, but a tad too bright, which I've also found with the Energy line (also owned by the same parent company). They could probably tame it by adjusting the x-over just a bit. The midrange is surprisingly good with the Athenas though.
I haven't heard the BICs so I can't comment on them. They look pretty standard for the price; basic and well, cheap (hey can't expect much for that price). This would lead me to believe the crossover is probably crap - which in turn is why the crossover mods make them sound better. The x-over was probably generically chosen based on driver specs and cost in mind, without any serious measurements done to adjust for ideal response (again, can't expect gold for pennies).