Abstract
Balanced armature (BA) receivers can be used as tweeters in earphones to increase their treble and ultra sound bandwidth. Key factors that influence the 9–20 kHz response of earphones when implementing BA tweeters are shown through experimental validation and comparison to newly-developed SPICE lumped parameter models (LPM). While the BA location and acoustic passage inside the earphone are important factors, the study focuses on how changes to the design of the earphone’s nozzle and the choice of ear-tips affect the 9–20 kHz frequency response. Improvements to existing SPICE LPM elements are provided, based on finite element analysis of the acoustic passageway that is formed between the compressed eartip and ear-simulator couplers. The model is compared to measurements from various nozzle and eartip configurations, validating its effectiveness to capture the earphone’s high frequency response due to changes to the earphone’s nozzle and eartip geometry.
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