These stacked configurations are soooooo good. Unfortunately the ADA-1000 can't adequately power this M50/M5 monster on some peaks. The 1000 is great with M50, M3, M100 and very likely M60 and M80. The M5s are very power hungry.

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