The Prime 18XS is intended for use as a high-output bass driver in multi way systems and 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 laminated silicone suspensions, a large Xmax of 12mm with peak to peak travel of 60mm, ensures fast accurate 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 1200 Watts (A.E.S.) continuous and can cope with peaks in excess of 4800 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 Prime 18XS exhibits 100 dB sensitivity and can deliver bass down to 29 Hz (-6 dB) in a 200 litre ported enclosure.
Key features of the Colossus PRIME 18XS include:
New motor structure (highly optimised by FEA, Y35 highest ferrite grade, low interference flux path)
Massive 64mm p-p excursion capacity
Newly designed chassis
30mm voice coil height
New high profile back plate
Electro Acoustic Specifications:
Nominal Chassis Diameter: 18"
Impedance: 8 Ohms
Power Handling: 1200W (A.E.S.)
Peak Power (6dB Crest Factor): 4800W (A.E.S.)
Usable Frequency Range -6dB: 35 Hz - 500 Hz
Sensitivity (1W / 1m): 100 dB
Moving Mass inc. Air Load: 177 grams
Minimum Impedance Zmin: 6.5 Ohms
Effective Piston Diameter: 15.43" / 392 mm
Peak Displacement Volume of Cone Vd: 1.45 litres
Magnet Weight: 120 oz
Magnetic Gap Depth: 11mm / 0.43"
Flux Density: 1.1 Tesla
Coil Winding Height: 30mm / 1.18"
Voice Coil Diameter: 4.0" / 101.6mm
Thiele Small Parameters:
FS Hz: 33Hz
RE Ohms: 5.2 Ohms
Vas Ltr: 257
Vd litres: 1.45
CMS (mm/N): 0.124
BL T/m: 22.4
Mms (grms): 188
Xmax (mm): 12
Sd (cm2): 1210
Efficiency %: 2.2
Le (1k Hz): 1.5mH
Materials Of Construction:
Former Material: Glass Fibre
Voice Coil: Copper 'sandwich' inside external windings
Magnet Material: Ferrite
Chassis: Die-cast Aluminium
Cone: Straight polycellulose Ribbed Cone
Surround / Edge Termination Polyvinyl Damped Multi Roll, Poly Cotton
Dust Dome: Solid Paper (Inverted)
Connectors: Push-button Spring Terminals
Polarity Positive Voltage at Red Terminal Causes Forward Motion of Cone
Mounting & Shipping Information:
Overall Diameter: 19.1" / 485mm
Width Across Flats: 18" / 457mm
Flange Height: 0.465" / 11.8mm
Baffle Hole Diameter F/M: 16.53" / 420mm
Baffle Hole Diameter R/M: 16.33" / 414mm
Gasket Supplied Front & Rear
Fixing Holes: 8 x 0.275" diam on 18.425
PCD / 8 x 0.275 diam on 17.25 PCD 8 x 7mm diam on 468 PCD / 8 x 7 diam on 438 PCD
Depth: 8.50" / 216mm
Weight: 33.75 lb / 15.3kg
Recommended Enclosure Volume: 4.41 -1 4.12 cu ft / 125 - 400 litres
Shipping Weight: 37.45 lb / 17kg
Packing Carton Dimensions 250 x 520 x 520mm