I would be interested in such a compact highly efficient tweeter. If you come up with one, please post your resuslts?

Also, let us know how your phase plug experiments go?

I would like to find an efficient 8" fullrange driver, 96db or more, that does not have a whizzer cone and can be run without a crosover on an OB down close to 80Hz.

So far, most of the drivers that I have seen that would work in this range, have large peaks starting around the 2kHz to 9kHz range.
I thought a phase plug could help tame these peakes somewhat.
I would like to stay away from any EQ or crossovers in the critical midrange if possible.

Some of the German 20cm fullrange drivers look promising.

Any suggestions?

Norris