Ask Axiom for the frequency and phase response curves of the LFR serial number you purchased for the SPL range you'll be listening to. Then send these to Emotiva and ask them to evaluate if their XPA5 can remain stable across the SPL and frequency ranges.

Or just skip that and buy the ADA from Axiom. I trust Andrew did his homework.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated