Originally Posted by jaromarcin
I'm not a specialist and I will take into consideration all options, however, from walls its very unlikely because it is old style building so it is concrete walls. However the ceiling is not, it is made from gypsum plasterboard, however, I used a lot of screws and used additional glue between all connection. But the room is very empty there is only a couch, desk and one huge wardrobe next to the desk, and even when you have a conversation in the room you can hear "something" like an echo.
Originally Posted by Leeliemix
A bigger, better and more expensive sub will be an improvement in most areas, but with that empty room you will still have the same problem, room correction might help but as i said try curtains and carpet at the very least. A room thats so naked its not comfortable to talk to another person in it will never be good for sound (almost no matter the equipment)and a few things like carpet and curtains can help a lot as a starting point.
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I think it's important to separate the issue of a boomy sounding subwoofer (with a resonance that may be under 40Hz) from the room echo you hear due to all the bare reflective surfaces. Softening influences such as carpet, drapes, and wall hangings (including wall art or acoustic panels) will definitely help with respect to mid-range and high-frequency reflections. And, they will reduce the slap-echo you are hearing, and make the room more comfortable for conversation.
But, as Ray noted, none of those things will have any effect at all on any of the frequencies that your subwoofer can play, and especially not on frequencies below 40Hz. Even the thickest bass traps (12" deep or so) can only affect frequencies down to about 60Hz or 70Hz. Bass frequencies may go through curtains, rugs, and even walls, as if they aren't even there.
If you are getting nasty resonance at low-frequencies from your subwoofer it is due to one of two things, or possibly to a combination of the two. First, I agree with others who have observed that your subwoofer is simply not powerful enough for the room and for the listening distances. For a desktop computer system, at a distance of a couple of feet, in a small room, it might be alright. @AmerCa
made some good suggestions for alternative subwoofer options.
Second, the placement of a subwoofer in a room strongly affects its performance. You should Google "sub crawl" and perform one to find the best acoustical location for your subwoofer. I can't guarantee that will fix your problem. As I said, I think that the subwoofer is simply not powerful enough, in any event. But, it may help a little until you can secure a replacement. And, it will be good practice for when you do have a more capable subwoofer, because subwoofers are like restaurants. Other than a subwoofer's native performance abilities, the three most important factors are "Location, Location, and Location".