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Suckout at 40 hertz...less pricey solutions?

Can bass traps or other room treatment help with measured 40 hertz bass suckout?

Problem is my listening room is almost a square.

My speakers Have powered woofers and try as my speaker dealer has to dial in the speakers he could not eliminate the 40 hertz suckout without making matters worse

my four walls and ceiling have absorption material and the ceiling is not flat nor low. It's a sloping ceiling 9-12 feet

I could massage part of the problem by adding an additional powered woofer to the speaker . The upgrade to my model is designed to have a powered woofer On top and bottom.

Cheaper of course would be room treatments

most expensive would be knocking out a wall making a rectangle but that in my converted garage would be the most pricey!

Any thoughts

thanks

mike

ps. Room sounds good but would like to within reason maximize potential of my excellent equipment
radioheadokplayer
rockadanny
1,224 posts
 
I had a 50Hz suckout (-10dB) I resolved with a pair of bass traps (GIK 244). I have two powered subwoofs and just for the heck of it I took one bass trap off of the wall behind my head and I had one extra just sitting in the closet. I stood them up near each of the two subs in various configurations. After numerous iterations I (luckily) found that by placing them next to one another (for a 4'x4' trap), 6" from one side of one of my subs the null disappeard (mostly, only -3dB now). Bingo! -3dB for a narrow null ain't bad. Problem solved!
p.s. During the juggling process I tried one behind the other for a double thick trap and one on top of the other for a tall trap, but standing on the floor side-x-side worked best for me. Try it!
magfan
1,583 posts
 
How wide is the notch? (in octaves or freq)

Google 'room mode calculator and enter your base dimensions. This could give you an idea of the resonant modes of the l/w of your room. The vaulted ceiling is tougher to figure.
face
516 posts
 
I had a few nasty nulls at low frequencies. Between adding GIK Monster traps and 6 244's, thing improved, but I still had one narrow but deep null at 60hz. Speaker repositioning was the only thing that fixed it. I pulled the speakers a little further into the room, which also added more depth to my soundstage.
eldartford
4,262 posts
 
A Behringer DEQ2496, which you can get (with mic and cable) for about $350 will show you what your problem is with its spectrum analyser (Real Rime Array, RTA). The RTA will also help you see the effectiveness of various room treatments that you might try. Oh, and by the way, you can also correct the problems using the equalizer function. You will no doubt recieve comments that the equalizer aproach won't work. I say, try it, and decide for yourself.
ecruz
402 posts
 
I will second what Eldartford said. I won't go back to a system without a DEQ of some sort. More people need to give these a try and see what happens.
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