Coaxial Compression Driver DIY (CCDIY) discussion

I'd say offer some efficiency for performance if need be. There is plenty of it to go around. Following with great interest!
True, dont need it for home use.
The HF sensitivity is only 90 dB/1m at 2.83V. That is just as sensitive as stock. I think it is caused by too high compression and poor sealing of the throat chamber, making it larger in volume than intended, which lowers HF efficiency.

The drawback of lower compression ratio on the MF, is bigger ports. This probably will cause more possible interference between the HF sound and the MF ports. But it will be evaluated.