Axiom Home Page Forums General Discussion Home Theater M80s for HT and Music

Hi Guys,

I put together a REALLY quick and FREE web site using my ISP. I only uploaded 3 pictures mostly to give a idea of the room. This is not great art by any means, but at least it gives me a vehicle to show some pictures.

Stephane

http://ca.geocities.com/smguillem@rogers.com/htsystempage.html

Hi Riker,

I moved my couch off the back wall and up about 3.5 feet. I lost about 80% of my bass as well. If I stood up, the bass was back, very annoying. Luckily all I had to do is move the couch back to its original position. Try moving seating position farther back or forward if possible.

Thanks for the advice ! It confirms that I am not going totaly crazy !! I always had my couch 4 feet away from the back wall because I did not want to be to far away from my tiny 34" TV. Dont' have a 100" screen yet But for sure I will try moving the couch back closer to the wall and see what that does.

Thanks again,

Stephane

Stephane,

Like some others may have mentioned, it would be extreamly benefitial to add some acoutic bass traps in your room. Self made traps are cheap and easy to make and will no doubt help your bass quality in your room.

According to Rives the optimum position for your seating position is 38% from the back wall of the total length of the room. (if your room is 10 ft long, your ears should be 3.8 feet from the back wall).

Here is a link of some pictures of a bass trap done with some OC703 Fiberglass.

-Robb.

Hi Robb,

Thanks for the advice, I think they would really help to. I found a DIY article (http://home.comcast.net/~jtgale01/diy2.htm) that used 9 inch round pipe insulation made of 2" fiberglass insulation. Same idea but round, just put to ends on it and wrap with cloth. I can make those for about $40CA each (3 feet height) so I was thinking of starting with a couple of those and go from there. I also inquired about Acoustic Science Research (ASC) products, they make round tube bass traps, very similar but more "sexy" than the home made ones.. They want close to $600US for each trap !! OUCH. I think I will start with the $40 dollar ones and take it from there.

Thanks !
Stephane

Riker,

Do these company's selling the "tube" design bass trap have any testing proof of their performance? It has been proven that the bass trap should "straddle" the corner for the best performance. This can only be done in in a rectangle shape.

I am not sure on the benefits of the round tube, before you build any or buy any, I would suggest going here and asking Ethan and the other experts if such a design works.

I am assuming that he will say that it will not provide as a substantial improvement as the straddling bass trap designs would. The reason the straddling is optimum is because it leaves an air gap behind the trap which aids in further absorbtion.

Just a word of caution, there are alot of phony acoustic products on the web!

>>Hadn't noticed.

I love your sense of humor

Well, now I am more educated and more confused than ever. I followed the link, which led to another link and another etc..I have read a lot of information, viewed a lot of pictures of various designs, and everyone has a slightly different approach on how to make bass traps and the likes. Ultratouch, compressed fiberglass, how thick, how far from the wall, velocity vs pressure trap etc.. bottom corner, ceiling corner etc.. I am not sure what is a good starting point anymore

Do I build square 2'x4' by 4" and just lay them accross the corners ? start with that and see ? should I also take the same "box" and hang it on the wall, 6 inches away from the wall ? This is one big can of worms and I don't want to start building things only to find that I should have done it a different way / method or placed it / hooked it up in a another way etc. Sorry if I sound a bit frazzled..but I guess I am.

Owens Corning 703 or 705 are the material that most select, as it is easier to work with than some other products. For corner bass trapping you want to use at least 4" of material, you can double up 2" material. Most straddle the wall/wall corners and wall/ceiling corners. First reflection points are for mid/high freq's so 2" 703 or whatever is fine, they are used to reduce the redundancy of the same signal hitting your ears at different intervals, which reduces clarity and imaging. Filling the entire corner will give you yet better bass trapping, that is called superchunks where you cut the 703 into triangles and fill the corners. This takes more material to go from floor to ceiling, but will give you better absorption. Keeping the first reflection points material off the wall somewhat aids in giving you better absorbtion. Here are some links that helped me, including a thread on this forum showing some of my construction. I also have pics on my website.

http://www.axiomaudio.com/boards/showflat.php?Cat=0&Number=144818&an=0&page=0#Post144818

http://www.ethanwiner.com/acoustics.html

http://gikacoustics.com/

http://www.radford.edu/~shelm/acoustics/bass-traps.html

http://www.audioholics.com/techtips/roomacoustics/DIYabsorbersacoustics.php