Abstract
AFR loudspeaker technology (audio full-range) combines the characteristics of distributed mode loudspeakers at mid and high frequencies with conventional loudspeaker piston action at low frequencies in a single driver. The combination retains the well-established advantages of the DML in respect of wide dispersion and improved interaction with reflective boundaries. A comparison study has been made using conventional 6-in. ceiling loudspeakers and AFR devices of comparable size in a typical open plan office situation. It is shown that the AFR devices exhibited noticeably improved coverage, clarity, and speech intelligibility. However, the use of traditional intelligibility measures, such as STI did not always reflect this subjectively observed trend. The use of STI or STIPa under high signal to noise conditions is questioned.
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