Axiom will make any shipper problems right if you contact them.
Is the M5 woofer moving at all? I am wondering if your yammy is having problems powering it. It's a 4 Ohm load down low. The M50 is an easy load. How long is your wire run and what gauge?
One of my QS10s sounds boss and is mounted as shown.
House of the Rising Sone Out in the mid or far field Dedicated mid-woofers are over-rated