Hello again- thanks for all the replies!
I didn’t get notifications, so sorry it’s taken me so long to respond.
I contacted Crites and upgraded the crossovers.
And I’m still using the Denon amp.
I ended up with a Klipsch 12” subwoofer - Many differing opinions out there.
But I didn’t want to drop $500 on a sub without knowing if I would like it.
I’m using an adaptor to go from RCA to speaker cable - putting the heresies & sub into the same terminal A.
so far it’s giving me what I wanted. I’m still experimenting with the crossover point.
80hz seems to be the consensus - your input would be appreciated.
thanks again!