I would be highly interested in to hearing everyone's crossover settings opinions. I have seven bookshelves with everything set on small and I'm crossing them over at 60 hertz right now and I have my two subs crossed at 80 Hertz but I seem to be lacking in the 70 area for some reason.
All input and opinions welcome. Thanks in advance
Try the higher 80 hz hpf for the speakers, avoid overlap with the subs, and then double check levels and phase. You could be experiencing some cancellation with the overlap.
Room acoustics at those frequencies are certainly having an influence as well. The simplest (if not cheapest) way to address uneven room response is to add another sub.
FWIW, my own rigs are all over the map. The only ones that have much overlap involve larger mains with lower hpf settings, with the sub lpf at a shallower slope, thus more overlap. I wouldn't press smaller speakers into such conditions, as it's a recipe for increased IM distortion.