The Scanspeak 18WU/4747T-00, 6.5" Illuminator woofers are based on compact under-hung motor systems with large neodymium ring magnets. The patent pending motor offers a very long linear excursion together with a very high force factor. The top plate is shaped to “guide” the backside airflow around the motor and with the very open cast aluminum chassis design the driver is virtually free from compression.
Driver Highlights:
Patented symmetrical drive motor system
Under hung motor system
Neodymium magnet
Voice coil gap fully encapsulated with copper caps
Exceptionally long line
Specifications
power handling (continuous/programme) = 80/150 W
frequency range = 28-3500 Hz
resonance frequency fs = 32 Hz
impedance R = 4 Ohm
sound pressure level SPL = 88,1 dB (2,83V; 1m)
DC resistance Re = 3,42 Ohm
force factor BL = 6 N/A
voice coil inductance L = 0,39 mH
effective piston radiating area Sd = 154 cm2
effective mechanical mass incl. air load mms = 17 g
equivalent volume of compliance Vas = 48,3 l
total Q factor Qts = 0,28 (Qms=3,42, Qes=0,30)
voice coil diameter = 42 mm
maximum peak linear excursion vibration xlin = +/- 9 mm
