With balanced inputs (D10b for example):I know, I am looking for maximum power actually (without going top of the line). I think it is the A30 Pro and D10 from them if I am not mistaken, but their lineup seems to have numbers and letters all over the place at a glance. I am used to GPU numbers (bigger is better or at least newer).
A30pro: 730 mW
L50: 636 mW
A30pro: 5.5 W
L50: 3.2 W
Both are pretty much top of the line.