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Challenging Room Node

I have a dedicated listening room that I have treated with GIK panels in the corners, first reflection points and behind the speakers.   I have had my 800 D3's in a number of positions and thought I had them locked in.  I ran some frequency sweeps using some test disks.  There is a node at 60hz so bad that the narrow frequency almost disappears.  When I stood up to move about the room it came back with a roar as soon as my head got above 4 1/2.  I was always thinking in 2 dimensions but evidently my room (17.25 x 23.13 x 8.54) has some vertical issues.  

I have mitigated pretty well by moving the speakers closer to the read wall but i give up some clarity.  I also think the speakers sound more dynamic when I stand.  Anyone encounter this issue and mitigated it?
jwalsh31
erik_squires
15,657 posts
 
The basic GIK panels wont work well at these frequencies.

You need Soffit traps or Tri Traps.  Stack them up in the corners so they reach up to the ceiling as much as possible.

The professional room solution is often a combination of bass traps + EQ.  See if these traps at least improve the null you are having. If so, and you are using Roon or any other EQ already,you can then use a little EQ to correct. :)

Let me know what you do and what you find.

Erik

fuzztone's avatar
fuzztone
5,497 posts
 
Almost all rooms have vertical nodes unless dba. Most often do to untreated ceilings.

mike_in_nc
1,121 posts
 
If the suckout is narrow enough (in frequency), it will be almost unnoticeable. That’s good news, because (1) 60 Hz is too low for most porous absorbers to be terribly effective, and (2) if it’s a true node, adding more volume via DSP will not be very helpful. So to my way of thinking, if you’ve found the listening and speaker positions that satisfy your ears otherwise, you could consider just living with it.

The other solution would be subs placed differently from your main speakers. That can be effective, but integrating subs optimally is not a simple task, by any measure.

backwash
52 posts
 
I tried the distributed bass array with very good results. Added two more subs(had two) and moved them around the room while running the test tones and SPL meter until I got most everything at or at least near the same volume. My subs are very randomly located now instead of being next to my main speakers. It's a lot of effort but it works well. I had at total null at 50 to 60 hz.
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