Have a look at LII Audio they are making some very nice full rangers that are proving to be quite good for the money, cheep enough to experiment with. I'm experimenting with the big 18" full ranger but that's just an experiment they have a 15" full range driver that's getting very good reviews and may give you more bass to get lower to the sub crossover.
Home - Lii Audio, unique speaker, amplfier, quality and cost-saving parts for HiFi DIY (lii-audio.com)
for a better but much more expensive option is the Voxative drivers , sound wonderful some of the best, IMO, made today.
Voxativ FULL-RANGE DRIVERS
Home - Lii Audio, unique speaker, amplfier, quality and cost-saving parts for HiFi DIY (lii-audio.com)
for a better but much more expensive option is the Voxative drivers , sound wonderful some of the best, IMO, made today.
Voxativ FULL-RANGE DRIVERS