Yes, my manual specifies 6 Ohm as well and a dynamic rating of 200WX2 channels into 2 Ohms. Smuth, you may want to read this. And FYI, I've ran M22s in parallel with M80s and M60s in parallel with M80s on this little Denon with no ill effect.

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