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How to fix a lack of bass Null

Hi
Have tryed tying all sorts of different key words on Audiogon, until to day did'nt relised, that a room could be affected by a lack of bass, from what I read, this call a null, I have tryed different equipment over the last couple of years as I always thought that my equiment was bass shy. I found this programe on Audiogon called Hunecke speaker calulator, not shore if I am using it properly,It shows a big dip @31.5 - 63 hz and could explain a lake of base at my seating position, I cant seem to be able to move the speaker with the cursor, this is suppose to change speaker location and tell you flatess spot I think if I am reading it right? Do I buy a meter and setup disk? what treaments is there for this problem (Nulls), if this is the case?I google with know real answer's!
Room 5.250L x 4.00W x 2.4H
k_rose
k_rose OP
32 posts
 
Thanks everybody great response so far, Ngjockey the room I am using is going to be a master bedroom one day and I built a ensuite of it, I will try leaving the door open never have!With regards to bass there is more up the front and down the back, I have contacted a person who as got all the answers like a Rives Audio, but these blocks are in Australia, I spent all morning taking photo's and drawing a mud map with as much detail as I could give them, I will post what the result are. There is know doubt that it is frustrating, you dont know where to start sometimes as it was only that I was thinking of getting a new cd player that I stumble on a thread that made me think what if it is the room, how many people sell there gear because of the room?
rockadanny
1,226 posts
 
I had a serious bass null at 55-65Hz and experimented with two GIK 244 panels, moving them around in different configurations near the sub until I was able to significantly reduce the null (from -10db to only -2db). Placement ended up being two panels next to one another, forming a 4'x4' mini wall, right next to the subwoofer (within 8" inches) where there was no wall (it is placed near a single wall so open on three sides). Apparently this cut off the specific freq. waves at just the correct spot. It was quite a relief to be able to do this so quickly and cheaply. So it can be done.
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shadorne
7,477 posts
 
Rocadanny,

What you probably did was to attenuate the tangential room mode. The nasty thing about tangential nulls is they line up along the center line of a room - so you get a null right down the middle of the length of the room no matter where you sit. Treating corners helps with this too.
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shadorne
7,477 posts
 
I'd suggest a fire place with logs stacked all around it on the rear wall of the master bedroom with bookshelves around it. The other thing is to consider a large extra thick latex mattress king size bed - avoid spring mattresses as they do little in the bass - a thick Latex mattress will be an extremely effective absorber placed at one end of the room or towards one of the four corners. The other trick is soft padded furniture - love seat with big cushions. You will be suprised - you can do a lot without causing a divorce (acoustic panels in a bedroom would certainly do that...)
newbee
4,790 posts
 
Phew! Thank god you said that "acoustic panels in a bedromm would certainly do that...". At first I thought you were recommending that the mattress be mounted on the wall or in the corners! :-) BTW, what frequency spectrum would be attenuated by the mattress you recommend?
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