Bass is clearer and more impactful when I stand vs. when I sit


Hello, 
I am having this issue with my speakers and my room. When I stand, I found that the bass is significantly clearer, more impactful and cleaner than when I sit. Also there are some bass I didn't hear before, now I can hear when I stand. 

I tried to tilt my speakers a little bit downwards but it doesn't solve the problem. 

What's wrong with my room/speakers and how can I fix this. 

Thank you. 
Huy


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@atmasphere Thank you for your advice. I just look at the website about Swarm, they are very interesting! I would try it if I had a bigger listening room and get approval from wife :)
This is normal. Over time I’ve realized that a great way to mitigate this is to have speakers that begin to drop off slowly at a relatively high frequency. You don’t want speakers that are flat to 30hz. You want speakers that begin to drop off at 80 hz or so and output slowly decreases from there. You still want your mains to have good sized woofers for the punch they provide. And you want them to have useful output in the deep bass, but it should be at a significantly lower level. The reason is that if you’re down significantly at 50hz the room problems will be greatly diminished. You won’t have a massive peak that overwhelms the room. Get a sub, or subs, to bring the deep bass levels up to where they should be. If you put your full range mains where they’re best for everything but the deep bass and it turns out the deep bass is terrible, then what?

Hi, the other guy here.

I took the advice I received to move the speakers - PMC MB2SE - closer together about a foot each closer to the center, as close as practical to the media unit, and also further forward about 6”. Towed in towards the seating position.

Problem solved.

Positioning was the key.