Bi-Amping Which amp for highs and which for lows?

I am running the highs with the A5 and the lows with the A2. Speakers are P-37 and they do sound awesome. 

That's great!
Enjoy the music!!!

OP, suggest you confirm that the two amps have identical gain.....

I checked and they both have 29db voltage gain. Why does the gain make a difference?

If the amps have different gain, you won’t be driving the HF and LF sections of your speaker equally.  If the HF amp has 2db more gain, then it’d be as though your HF drivers are 2db louder than they should be.

If you are happy , that’s all that matters and you can safely ignore this thread. :)