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The Colossus 18SB is intended for use as a high-output bass driver in multi way systems. It features a 4 inch 'sandwich' inside and outside windings voice coil, immersed in a symmetric magnetic field yielding increased linearity and lower distortion. This, coupled with a large Xmax of 8.25 mm and laminated silicone suspension, ensures tight, punchy bass at high levels of excursion. The cone membrane, manufactured from polycellulose, is much stronger and more durable than conventional paper pulp alternatives. This allows the driver to combine high-sensitivity with the structural integrity required to produce undistorted low frequencies at extreme sound pressure levels. The driver handles 1000 Watts (A.E.S.) continuous and can cope with peaks in excess of 4000 Watts. This is due to advanced thermal management in the form of vented die-cast chassis and increased motor system venting. These measures effectively remove heat from the voice coil, resulting in extremely low-power compression. The Colossus 18SB exhibits 100 dB sensitivity and can deliver bass down to 35 Hz (-6 dB) in a 200 Litre ported enclosure.
Nominal Chassis Diameter 18" / 457.2 mm
Impedance 8 Ω
Power Handling 1000 W (A.E.S.)
Peak Power (6dB Crest Factor) 4000 W (A.E.S.)
Usable Frequency Range (-6dB) 35 Hz - 2.5 kHz
Sensitivity (1W - 1m) 100 dB
Moving Mass (inc. Air Load) 177 grams
Minimum Impedance (Zmin) 6.5 Ω
Effective Piston Diameter 14.84" / 376.93 mm
Magnet Weight 120 oz
Magnetic Gap Depth 0.43" / 11 mm
Flux Density 1.1 Tesla
Coil Winding Height 0.87" / 22 mm
Voice Coil Diameter 4.0" / 101.6 mm
Speaker Type Sub Bass Driver
Thiele Small Parameters (TSPs)
FS 36 Hz
Re 5.2 Ω
QMS 6.583
QES 0.366
QTS 0.346
Vas 199 Litres
Vd 0.893 Litres
CMS 0.109 mm/N
BL 24 T/m
MMS 177.2 grams
Xmax 8.25 mm
Sd 1134 cm2
Efficiency 2.49%
Le 2.23 mH
EBP 98.36 Hz