UPDATE:
So I s/w the sales manager from a HT install company and he stated my room was too small for a 15" and recommended I get a "High End" hard hitting 10" x2.
My room is ~315squar feet / 2400cubic feet
He recommended the JL line (e110 model) and the Paradigm Defiance line (x10).
I inquired if I could get another one of my monoprice monolith 10" subs. He did some research and stated while the monolith has the power, it does have the capacity to move air like the JL or the Paradigm could (? excursion value)
What your thoughts regarding this?
I wouldn't listen to him.
My living room is 16x14x9 with two wide open doorways. I'm %80 movies and %20 music.
I had a PB4000 then upgraded to a PB16 Ultra and I still felt I was missing that mid-bass slam.
I now own One Power Sound Audio TV1812 and the sound signature compared to the PB16 is night and day. IMHO the PB4000 & PB16 always sounded Muddy to me, they both lacked that chest slam during movies like John wick & Fury.
He is a REW sweep in my room ( no EQ) yes I have some nulls, but a 2nd sub will fix that.
I get usable output down to 9.5 hz
The TV1812 gives me plenty of ULF, mid-bass and TR ( makes my couch shake) I'm on a concrete slab and I sit about 11 feet away from the sub.
I highly suggest to order a couple subs and keep whatever sounds/ feels best in your room.
Subwoofer I would consider
JTR Cap2400 ULF
PSA TV1812
Rythmik FV18 PC