Abstract
This work shows the effect of the drive point impedance of a finite acoustic system on the power delivered by a realistic source. At low frequencies when the modal overlap of the system is small, the frequency-averaged power delivered by the source can be much less than the power which the source would deliver to an equivalent semi-infinite system. An analysis of the power flow into a finite one-dimensional wave tube is used to explain the observation that broad-band high-intensity acoustic drivers deliver less low-frequency power to small reverberation chambers than they deliver to progressive wave tubes. The analysis indicates that the modal overlap also plays a central role in the determination of the ratio of space-averaged to drive point response.
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