The impulse response of a panel loudspeaker with a single moving-coil driver contains ringing due to the resonant frequencies, but the implication of this type of response for intelligible reproduction of speech signals is the subject of some debate. The impulse responses of three examples of such loudspeakers of various sizes and materials were measured in an anechoic environment and compared to that of a conventional speaker. Reverberation effects are clear and calculation of the Speech Transmission Index (STI) confirms a loss of intelligibility; the STI values of the plate loudspeakers are 6% to 13% lower than that of the conventional speaker. Spectrograms of reproduced speech by each plate also show a considerable loss of detail.
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