Uneven Frequency Response in Treated Room

[laurynasmega]

Hello everyone,

I recently conducted measurements in my room, and the results indicate that the frequency response is quite uneven. I've already treated the room with acoustic panels, so the RT60 isn't too bad. However, I'm still encountering issues with certain frequencies.

Specifically, there are sudden gaps and rises in some frequency responses that I’m not sure how to address. I’m attaching the graph of the frequency response for better clarity.

I'm really not sure how to explain it, but basically, if I put something to treat just the lower frequencies, let's say 20-300Hz, it would drop all the frequencies, whereas I only need to fix specific regions like the 40Hz region and the 80Hz region dip, among others. Is the answer lying in room modes, or is it something different?

I am also not sure how to get out from the dips. How am I supposed to raise the 80Hz dip or any other? I was thinking I might need to use room modes or diffusors for this kind of job because overall, the response isn't that bad.

Any advice on how to smooth out these irregularities would be greatly appreciated. Looking forward to your expert suggestions!

Thank you!

 

[Wayne A. Pflughaupt]

My understanding is that treatments help deaden a room, with minimal change to frequency response.

I have my doubts if the highlighted area is readily audible. I’d be more concerned about the huge hole between 550 Hz – 3 kHz.

Regards,
Wayne

 

[sam_adams]

Is the answer lying in room modes, or is it something different?

It could be SBIR—depends on how close to the room boundary the speaker is. Good SBIR explanation and nifty animation.

 

[VinceHoffman]

Some photos of the room as it is currently setup and acoustically treated along with a description of the gear and acoustic treatments you've employed would be very helpful @laurynasmega.

 

[Audio_Guy_UofW]

The low frequency peaks and dips are most likely room modes, which are nearly impossible to treat with absorption...other than tuned absorbers. Multi Sub layouts can mitigate this, especially if individually tuned using minidsp/MSO or Dirac ARC or similar multisub optimization approaches.

 

[DanDan]

Some more info would be helpful. Room Dimensions. Number and size of traps. What are the boundaries made of? e.g. Solid concrete floor with laminate or? Walls and Ceiling. Pictures. Type and location of speakers. Deep and large bass trapping particularly in tricorners and corners will diminish modal peaks but also mitigate the nulls. Also extensive trapping softens destructive early reflections. So enough treatment causes more bass, and not a lack of HF.