When you view the M22's in the product section they recommend either the EP350 or EP500 for them. The M22's play down to 60 hz... the M60's play down to 37 hz and the M80's play down to 34 hz... though my 'seat-of-the-pants' meter has them playing even lower than that!

My Stuff :

M80's
QS8's
VP150
EP800
Denon 4802
Emotiva XPA-3
Samsung BD-P3600
Sharp 65 Inch Aquos LCD