I don't think there is a "single" speaker with that capability. But there are certainly coaxial two way speakers out there. GPA, Great Plains Audio, has upgraded versions of the Altec 604. Tannoy is still in business. Probably others too.
I do like high efficiency speakers. Mine are not coaxial.
I do have one low efficiency pair of speakers.
I do like high efficiency speakers. Mine are not coaxial.
I do have one low efficiency pair of speakers.