Polar variations with frequency

Whether particular frequency components add or subtract in the far field will depend on the loudspeaker system spacing, the angular offset of the listener with respect to the centre line, and the wavelength.

The following polar responses show what happens when subwoofers are placed 8.6m apart and are driven in unison at various frequencies:

100Hz

The polar plot shows the far field polar response of the two subwoofers when driven in phase with the same 100Hz signal. Subwoofer interaction causes irregular coverage either side of the centre line.

Response nulls (cancellations) occur at the sides because the spacing is an odd number of half-wavelengths causing this frequency component to cancel in the far field.

80Hz

The above shows the same system at 80Hz.

At this frequency the central position remains well covered but the polar pattern has changed dramatically around the sides. There are now strong lobes at the sides because the spacing is now an even number of half- wavelengths at this particular frequency.

All material © 2007. Martin Audio Ltd. Subject to change without notice.

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Martin Audio WLXGS manual Polar variations with frequency
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WLX, WLXGS specifications

The Martin Audio WLXGS and WLX line array systems represent a remarkable advancement in professional audio technology, providing powerful and precise sound reinforcement for various applications, from concerts to corporate events. These systems are part of Martin Audio's commitment to delivering high-performance sound solutions that are both reliable and easy to use.

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