Are your speakers new? If so, as others have suggested you may need to give them a little time to break in. If that’s not the issue, what speakers did you own before these and were you satisfied with the bass performance? if not, it’s possible that your personal preferences are such that subs will be necessary to meet your expectations.
did you buy the speakers from a dealer in your area? If so, and they are relatively new your dealer should help you with this problem. Maybe he could bring different speakers or a different amp to your room and experiment. As others suggested, these are quality speakers, which should make enough bass, but “enough“ is subjective and you have too much money invested to be dissatisfied. If you bought them from a quality dealer, you should have a partner in solving this. Good luck.