The PMT Series family of micro speakers, from Tymphany, is designed for maximum full-range bandwidth, while maintaining superior off-axis response.
Tymphany built the 3/4" 30N18AL04 PMT Series premium micro transducer for computer, television, micro array, and similar modern audio applications. It features a neodymium motor, light aluminum cone, and high-temperature polycarbonate frame that is designed for minimum center-to-center mounting distance and reduced comb filtering.
A low 223 Hz resonant frequency allows the 30N18AL04 to reproduce frequencies lower than most drivers this size (250 Hz), while maintaining an average sensitivity of 81.6 dB (2.83V/1m) from 300 to 14,000 Hz. Using four drivers in a series-parallel group of four units increases sensitivity to a respectable 87.6 dB (2.83V/1m).