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What happened to my room acoustics

I measured the spectrogram for my room at my MLP, and the FFT results are as follows:

- There is a roll-off before 20kHz.

- A dip is present around 12kHz.

- There is a noticeable boost between 50Hz and 1.5kHz.

- The bass rolls off around 33Hz at -3dB, consistent with the factory rating.

Comparing these measurements to the Burchardt measurements, there are some differences:

- It doesn’t exhibit a roll-off before 20kHz.

- The dip is around 15kHz.

- The boost between 50Hz and 1.5kHz is not as pronounced as in my room.

I’m curious about what might be happening with my room acoustics. If a fix is possible, what would it entail?

Spectrogram from my zoom

 

My room / speakers setup

 

Measurements from Burchardt

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Showing 1 response by audiokinesis

audiokinesis
2,722 posts
 

In my opinion:

 "There is a roll-off before 20kHz.."  This is the shortest wavelengths being absorbed by surfaces in the room. 

"A dip is present around 12kHz.."  There will be a on-axis cancellation dip in the response with a round horn or round waveguide, centered on the frequency where the mouth reflection arrives 180 degrees out-of-phase a the listening position.   The center frequency of this dip changes with listening distance or microphone distance.  Off-axis the arrival time of the horn mouth reflection is smeared, and the cancellation dippage is correspondingly reduced. 

"There is a noticeable boost between 50Hz and 1.5kHz."  The midwoofer's pattern is wider than the waveguide's pattern below the crossover frequency resulting in more in-room energy below the crossover frequency.

Duke

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