Description
The Colossus 18XB is intended for use as a high-output sub-bass driver either singly or in multi way systems. The unit features a 4 inch ‘sandwich’ inside and outside windings voice coil, immersed in a symmetric magnetic field and centralized by using two suspensions in a dual arrangement to maintain ultra linearity and stability at high excursions. The heavily ribbed straight-sided paper cone membrane is reinforced with high-strength composite fibres to resist deformation under extreme loads. 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 a vented die-cast chassis and motor system using an internal heatsink coupled to a large vaned heatsink mounted on the rear of the unit. These measures effectively remove heat from the voice coil resulting in extremely low-power compression. The Colossus 18XB is designed for use in 100 to 250 Litre ported enclosures.
- 2000 WÂ Program Power.
- 99 dBÂ Sensitivity (1W/1m).
- Great replacement driver for most bass reflex applications.
- Vented chassis and motor design provides efficient thermal management and extremely low power compression.
- High BL factor, 25.9 T/m.
- Dual ‘spaced’ suspension system and advanced materials offers ultra-linearity, mechanical stability and superior acoustic performance at high levels of excursion.
- Ribbed, fibre loaded, UK manufactured cone offers increased strength, durability and resistance to deformation under extreme loads.
- Designed for optimum use in 100-250 Litre ported enclosure designs.
- 4-inch Inside/ outside windings copper voice coil.
Electro Acoustic Specifications Nominal Chassis Diameter 18″ / 457.2 mm Impedance 4 /8 /16 Ω Power Handling 1000 W (A.E.S.) Peak Power (6dB Crest Factor) 4000 W (A.E.S.) Usable Frequency Range (-6dB) 35 Hz – 1 kHz Sensitivity (1W – 1m) 99 dB Moving Mass (inc. Air Load) 173 grams Minimum Impedance (Zmin) 6.5 Ω Effective Piston Diameter 15.03″ / 381.76 mm Magnet Weight 120 oz Magnetic Gap Depth 0.39″ / 10 mm Flux Density 1.2 Tesla Coil Winding Height 0.90″ / 23 mm Voice Coil Diameter 4.0″ / 101.6 mm Speaker Type Sub Bass Driver Thiele Small Parameters (TSPs) FS 33 Hz Re 6.5 Ω QMS 5.77 QES 0.358 QTS 0.337 Vas 236 Litres Vd 0.803 Litres CMS 0.13 mm/N BL 25.9 T/m MMS 173 grams Xmax 7.5 mm Sd 1131 cm2 Efficiency 2.3% Le 1.99 mH EBP 92.18 Hz Materials of Construction Coil Former Material Glass Fibre Voice Coil Material Copper – Inside / Outside Windings Magnet Material Ferrite Chassis Material Die-cast Aluminium Cone Material Straight Polycellulose Ribbed Cone 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 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 & Rear 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 8.05″ / 205 mm Weight 31.29 lb / 14.2 Kg Recommended Enclosure Volume 3.53 – 8.82 cu ft / 125 – 400 Litres Shipping Weight 35.26 lb / 16 Kg Packing Carton Dimensions (W) 512 (D) 512 (H) 244 mm
