@starystarynite But I couldn’t feel the speaker is not enough as the space is too huge for it. Now I have sold my speakers...
Not enough of what?
In my experience for the cost of two mid-priced off shore made 'Sub-Bass' speakers a distributed bass array Swarm would have loaded your unusual room with a clearly better integrated mid to low frequency presentation, adjustable to the speakers you just sold or any future speaker choice.