The room has a ton to do with bass under 200hz. Is your room small or square?
When I hear about slow, sloppy, undefined bass, it is usually a room with a long decay time and ringing.
Getting good sound quality below 200Hz
I run open baffles with currently 15" Eminence Alpha bass drivers with their dedicated Rotel amp and crossed over at 200Hz with 24db slope.
This underpins the upper driver beautifully but by contrast if I play it on its own its not at all impressive, lacking primarily in both definition around the sounds and also impact.
My first question "is this typical of what sound is like below 200Hz"
Secondly looking to improve this should I concentrate on improving the 15"drivers or the amp?
Please don’t recommend a powered sub as I have one already which will eventually underpin the 15"drivers when I have that bit right.
Thanks