The 4500H is on sale at Visions. It gives you AL32 processing. Also the power transformer isn't located under the processing boards. That's a big turn-off for me.

https://m.visions.ca/#/home-productdetail?productId=44150&sku=AVRX4500H

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