It features a non-resonant cone and dust cap structure, dynamic linear suspension, SD-1 magnet system, "Grasshopper" cast chassis with maximized air flow and resonance terminating mounting system. Less resonance in all structures, lower compression and higher linearity, faster termination of excess energy and higher sound pressure capability. The 18W/4531G should have an F3 of about 65Hz sealed and 40Hz vented. Also an excellent choice for high end autosound applications.
Specifications
power handling (continuous/programme) = 70 W
frequency range = 30-5000 Hz
resonance frequency fs = 34 Hz
impedance R = 4 Ohm
sound pressure level SPL = 90 dB (2,83V; 1m)
DC resistance Re = 4,90 Ohm
force factor BL = 3,05 N/A
voice coil inductance L = 0,27 mH
effective piston radiating area Sd = 157 cm2
effective mechanical mass incl. air load mms = 16,9 g
equivalent volume of compliance Vas = 45,6 l
total Q factor Qts = 0,35 (Qms=4,90, Qes=0,38)
voice coil diameter = 38 mm
maximum peak linear excursion vibration xlin = +/- 6,5 mm
