Tang Band W4-1720 4" is a 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.
Specifications:
frequency range = 60-8000 Hz
resonance frequency fs = 60 Hz
impedance R = 4 Ohm
sound pressure level SPL = 86 dB
DC resistance Re = 3,8 Ohm
force factor BL = 3,82 N/A
voice coil inductance L = 0,037 mH
effective piston radiating area Sd = 57 cm2
effective mechanical mass incl. air load mms = 5 g
equivalent volume of compliance Vas = 5,92 l
total Q factor Qts = 0,42 (Qms=2,33, Qes=0,51)
voice coil diameter = 32 mm
maximum peak linear excursion vibration xlin = +/- 2,5 mm
