@bumpy48, I'm taking it that your listening experience is related to playing full range music but without the higher frequency drivers connnected. If that is the case, then I'm not sure that the listening experience will be that useful since the majority of bass instruments have harmonics way above the 200hz. That's precisely why there is a disjunction between what you hear when playing the bass drivers alone and then playing full range. You could get a synthesiser and play some sinewaves in the chosen frequency range but that won't be particularly educational either, I think.
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