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Compensating the Acoustical Loading of Small Loudspeakers Mounted Near Desktops

In professional audio applications, small loudspeakers are often mounted on or near (within the loudspeaker 's near field region) large solid surfaces, such as mixing consoles, desktops and work surfaces. In approximately two-thirds of loudspeakers mounted in such a fashion, the magnitude response is compromised in a predictable and systematic way. An upward deviation of peak value 5.0dB ±1.5dB centred on 141Hz ±31Hz was observable in approximately 80% of the cases studied. An additional Room Response Control in active loudspeakers is proposed to compensate for this aberration. A statistical analysis of 89 near-field loudspeakers helps define the correction filter, and quantifies the effectiveness of the fixed filter design. Use of the proposed filter in an automated response optimisation algorithm for in-situ response equalisation is demonstrated.

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