If I could have children with an inanimate lump of metal...

...it would have to be this.

photo courtesy: BMS Audio site

BMS' new coaxial compression driver, comprising of a 1.75" HF diaphragm and an annular 3.5" midrange, sharing the same magnet. The whole vocal range covered from one point source, eliminating smearing in the time domain in the critical 1-5khz band. Nice.
Intermodulation distortion is now a potential problem though...unless a very steep crossover slope is used, there's going to be low order (3rd?) intermodulation products around crossover frequency.

The datasheet recommends it to be crossed over at 300hz, which demands a rather long waveguide flare and probably makes the midrange diaphragm move like a rampant rabbit. Crossing it over at 500hz or so seems more sensible as it would increase power handling and allow it to be mated to a shorter flare. Best of all, it's now feasible to meet this with a 15" underneath without driving >1khz into a breakup mode. Most 15" drivers will do it, but beamwidth narrows without a phase plug and cone standing waves become a problem.

Wonder what the first company to use this in an ultra-compact high power wedge is going to be. It's going to kick arse for vocal monitoring. Normally, the singer is so damn close to the traditional 2 way wedge that he gets not enough lower midrange due to the poor pistonic action of the woofer when his bonce is positioned over the tweeter end. That's solved by a point source covering the whole low midrange and upwards, aided by a waveguide to control directivity. The midbass woofer under it will be much happier now it's truly pistonic and not farting along at 1khz.

An alternative to forcing the woofer too high in a 2 way system is to use a large format 2" exit compression driver. However, towards 16khz or so, many (not all! JBL's medium output Cinema series manage it!) diaphragms go into a rocking mode and break up, rolling off early. On the plus side, power handling is increased. To be honest, 16khz roll off isn't a problem when the singer's had his ears abused by 20 years of monitors louder than Concorde...