Since the invention of the electrodynamic loudspeaker, there has been a need for greater acoustical output, especially at low frequencies. For modern-day applications it is desirable to reduce the volume of the loudspeaker (and cabinet). These two facts are physically contradictory. This paper offers options to evoke the illusion of a higher bass response while the power radiated by the loudspeaker at those low frequencies remains the same or even lower. This is feasible only by exploiting certain psychoacoustic phenomena. The required nonlinear signal processing was studied for a number of specific implementations in continuous and discrete time.:
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https://aes2.org/publications/elibrary-page/?id=9187
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