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Old 21st September 2013
  #17
Here for the gear
 
FoLLgoTT's Avatar
 

I did my final experiment and added a parametric equalizer to the SBA + absorber. Since room modes show a minimum phase behaviour an IIR filter should eliminate the decay.

Measurements were done at 4m distance to the front wall.

Frequency response flat signal + PEQ:


Waterfall flat signal:


Waterfall PEQ:


Spectrogram flat signal:


Spectrogram PEQ:



The results are excellent! SBA + 55 cm Absorber + PEQ looks equal to a full DBA.

The response is valid for a complete seat row. The second seat row shows a wide peak of about +7 dB, but there is no long decay either. The peak is no surprise and should be considered when planning such an array. With a high number of seat rows a thicker absorber or a DBA are the better choices.
Attached Thumbnails
Single Bass Array with massive damping (measurements inside)-amplitudengang-4m-ohne-equalizer.png   Single Bass Array with massive damping (measurements inside)-abklingspektrum-4m-ohne.png   Single Bass Array with massive damping (measurements inside)-abklingspektrum-4m-equalizer.png   Single Bass Array with massive damping (measurements inside)-spektrogramm-4m-ohne.png   Single Bass Array with massive damping (measurements inside)-spektrogramm-4m-equalizer.png