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Test & measurement
The W4-1720 4" midbass features a long throw, underhung 1-1/4" voice coil driven by a massive ferrite magnet structure.
Tang Band W4-1720 4" Underhung Midbass Driver
A shorting ring on the polepiece is responsible for the speaker's extremely low levels of second and third order harmonic distortion. This impressive motor is coupled to an optimized paper cone with rubber surround, supported by a cast aluminum frame.