How to kill a 165hz ceiling null...

tinker · 3 Weeks Ago

Greetings,
I have just done extensive work to try to flatten my room response. I have massive amounts of all kind of treatments, both absorption and diffusion. I still have an approximately 10dB null at listening position centered around 165hz. Everything else from 300-7800hz is more or less within 6-7 dB in range, with a steadyish drop from 12000hz to 20k which I attribute to the amount of absorbtion panels.
However, my ceiling is 211 cm's, and 165hz is a 209cm wavelength, so I think therein lies my trouble. Currently, the 8'x12' ceiling has 2 4'x2'x1" RHT80 roxul panels, 2 4'x2'x2" panels, and 2 'clouds', 4'x2'x2" hanging 12" down.
What else can I do to remove this unsightly dip in my response curve?
Any tips would be appreciated...
Thanks

Jens Eklund · 3 Weeks Ago

Making sense of modes, standing waves and bass traps

SBIR

3 Weeks Ago	#1
tinker Gear interested Join Date: Nov 2011 Posts: 2 Thread Starter	How to kill a 165hz ceiling null... Greetings, I have just done extensive work to try to flatten my room response. I have massive amounts of all kind of treatments, both absorption and diffusion. I still have an approximately 10dB null at listening position centered around 165hz. Everything else from 300-7800hz is more or less within 6-7 dB in range, with a steadyish drop from 12000hz to 20k which I attribute to the amount of absorbtion panels. However, my ceiling is 211 cm's, and 165hz is a 209cm wavelength, so I think therein lies my trouble. Currently, the 8'x12' ceiling has 2 4'x2'x1" RHT80 roxul panels, 2 4'x2'x2" panels, and 2 'clouds', 4'x2'x2" hanging 12" down. What else can I do to remove this unsightly dip in my response curve? Any tips would be appreciated... Thanks

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3 Weeks Ago	#2
Jens Eklund Lives for gear Join Date: Oct 2009 Location: Stockholm Posts: 2,678	Making sense of modes, standing waves and bass traps SBIR