Thanks for your input Bill.
Just like you I think the 504C will do a better job on the mid range.
I also read that is a "2.5-way speaker" Inside mid-woofers play different frequencies than the outside mid-woofers.
"helps to diminish the "comb-filtering" - the 504C will provide a wider listening window ie: it will cover the full length of a room instead of the person in the middle."
Looks great on paper. My wife says I'm just building my case and justifying the expense. I told her she was right, right after placing the order online. 🙂
Cheers.