Bakoon 11R vs 7511/7512

Bakoon makes two ranges - the 7511 is the Japanese 15w amp, and the 11R (soon to be 12R) the Korean 15w variant.

I am testing a 7511 with Living Voice speakers, and they are efficient enough that it works brilliantly

The 11R appears a more sophisticated design (separate amp and power supply) but I have never seen a comparison of the relative sonics of the two.

Has anyone done it? And what were the speakers and how efficient are they?