room acoustics needed for beginner in bedroom

[hardcore_gamer29]

So i have just build my 2.1 setup with Denon x4800h DALI opticon 2 mk2 and svs pb 2000 pro. Now this subwoofer is not performing i tried many settings watched many videos and evens subwoofer crawl failed. Now its time to step into the world of room acoustics. I am attaching a video that gives 360 view of my room with instructions of each wall written with my sitting distance possible. So, would like to know the best wall for wall mount where there is minimal need of room acoustics. Like i have written which wall has wooden door to left or right or open window so that acoustics can be treated according to it. As its a bedroom not dedicated ht room i would like minimum required acoustics. The main issue is subwoofer only though speakers sound best. I will be getting rid of pc table and tv unit as well from this room and will wallmount tv. So which will be best wall so that i can put my subwoofer in front only to blend with dali fronts
youtube

 

[twinkletoes]

When you say it’s not preforming what do you mean? What’s actually wrong?

 

[hardcore_gamer29]

When you say it’s not preforming what do you mean? What’s actually wrong?

mid level bass is missing or very low but loud basss is very very good. I ran loop video 5 hz to 120hz on youtube. it was deep till 70hz then 75 80 was not there i could not hear