"Lobing" between two spherical wavefronts (drivers)

"Lobing" between two spherical wavefronts (something like loudspeaker) occurs when they are greater than 1/4 wavelength apart.

  • Below this, they "sum" acoustically, as if they were a single source with double the output.

  • Above this, destructive interference gets gradually worse as you rise in frequency,
       or lower (size of) wavelength. There is some summation and some destruction.



  • Most listeners say they don't notice any loss of uppermost octave info when listening to the 1/2 wavelength method.

      Calculate Frequency for given Distance

     
    Distance between Chassis ( center - center ):  cm   
     
     
    1/2 wave method = Hz
    1/4 wave method = Hz
     



     
    Crossover Frequency:  Hz  
     
     
    1/2 wave method = cm ( center - center )
    1/4 wave method = cm ( center - center )
     


    Have also a look here:
    Wavelength - Frequency Calculator

    Baffle Diffraction Loss





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