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The Imperium 18NDXL is an efficient high power handling driver specially designed to provide powerful and accurate bass with low distortion and low power compression. The driver exhibits smooth tonal character combined with an ultra fast response time. The Imperium 18NDXL utilises an optimised fibre loaded cone assembly controlled by a fully optimised multi roll surround. The units spaced dual suspension configuration ensures excellent control during large excursions. A fully optimised motor structure built around a unique aluminum core ensures maximum flux yield from compact design and generates the minimum amount of flux modulation. The cast chassis base venting and large motor venting ensures efficient ventilation of the unit to keep power compression to a minimum.
2400 W Program Power.
98.5 dB Sensitivity (1W/1m).
New, vented cast aluminium chassis design.
Lightweight and efficient neodymium motor system generates minimal flux modulation.
Aluminium core heat sink and large motor venting provides reduced power compression and effective temperature regulation.
Long driver excursion. Peak to peak travel of 52mm.
High BL factor for controlled, fast and accurate low frequency sound reproduction.
Dual 'spaced' suspension system provides increased linearity and control at high levels of excursion.
Suitable for bass reflex or horn loaded enclosure designs.
5-inch Copper voice coil.
Electro Acoustic Specifications
Nominal Chassis Diameter 18" / 457.2 mm
Impedance 8 Ω
Power Handling 1200 W (A.E.S.)
Peak Power (6dB Crest Factor) 4800 W (A.E.S.)
Usable Frequency Range (-6dB) 30Hz - 2 kHz
Sensitivity (1W - 1m) 98.5 dB
Moving Mass (inc. Air Load) 220 grams
Minimum Impedance (Zmin) 6.5 Ω
Effective Piston Diameter 15.68" / 398.27 mm
Magnet Weight N/a
Magnetic Gap Depth 0.47" / 12 mm
Flux Density 1.2 Tesla
Coil Winding Height 1.1" / 28 mm
Voice Coil Diameter 5.0" / 127 mm
Speaker Type Sub Bass Driver
Thiele Small Parameters (TSPs)
FS 33 Hz
Re 5.6 Ω
Vas 203 Litres
Vd 1.35 Litres
CMS 0.106 mm/N
BL 29.4 T/m
MMS 220 grams
Xmax 12 mm
Sd 1164 cm2
Le 2.76 mH
EBP 110 Hz
Materials of Construction
Coil Former Material Glass Fibre
Voice Coil Material Copper
Magnet Material Neodymium
Chassis Material Die-cast Aluminium
Cone Material Paper
Surround / Edge Termination Polyvinyl Damped Multi Roll. Poly Cotton
Dust Dome Material Paper
Connectors Push-button Spring Terminals
Polarity Positive voltage at red terminal causes forward motion of cone
Mounting / Shipping Information
Overall Diameter 19.1" / 485 mm
Width Across Flats 18" / 457.2 mm
Flange Height 0.465" / 11.8 mm
Baffle Hole Diameter F/M 16.53" / 419.86 mm
Baffle Hole Diameter R/M 16.33" / 414.78 mm
Gasket Supplied Front
Outer Fixing Holes 8x ø 0.275" on 18.425" PCD / 8x ø 7 mm on 468 mm PCD
Inner Fixing Holes 8x ø 0.275" on 17.25" PCD / 8x ø 7 mm on 438.15 mm PCD
Depth 8.01" / 203.55 mm
Weight 25.35 lb / 11.5 Kg
Recommended Enclosure Volume 60 - 230 Litres
Shipping Weight 25.5 lb / 11.57 Kg
Packing Carton Dimensions (W) 485 (D) 485 (H) 230 mm