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

 

[twinkletoes]

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

ahh you have potential bass suck/room mode problem/phase problem. Your room looks almost square so it will be problematic.

Silly question have you set the crossover correctly within the amp? and bypassed it on the subwoofer?

Have you re-run the calibration when placing the subwoofer? Every movement you make it will need to be re-run.

Have you played with the subwoofer app EQ if so re set everything to flat.

I take it those measurements/sweep you took was from the listening position?

Do you get the same problem if you allow the speakers to play down to 60hz and then let the subwoofer take over? remember you're after a blend it should all be the same perceived level if that make sense?

Room mode problems are difficult to over come and it maybe something you have to live with but you can normally find a space where its ok. For me in the first instance, as you're trouble shooting, id keep the subwoofer in-between the front speakers for the moment, moving left or right millimetres at a time! Small movements can make big changes. Don't play bass sweeps, play a familiar piece of music, Something with loads of bass, my go to is Dj shadows three Ralph. Ported subs can also make this problem worst in my experience but there isnt much you can do about that now.

 

[hardcore_gamer29]

i ahve tried all options in denon x4800h using lfe only lfe+mains tries crossovers 60 70 90 110 120 etc... one thing is that where i sit if i put subwoofer just right of my chair bass is very good deep . how is this possible?