Eighteen Sound 18LW1400 Bass Speaker

Key features

• 98 dB SPL 1W / 1m average sensitivity
• 100 mm (4 in) Interleaved Sandwich Voice coil (ISV)
• 1000W continuous pink noise power handling
• Weather protected cone and plates for outdoor usage
• Double Silicon Spider (DSS) for improved excursion controland linearity
• Double Demodulating Rings (DDR) for lower distortion andimproved heat dissipation
• Improved heat dissipation via unique basket design andeight backplate vents

Description

The 18LW1400 is an extended low frequency loudspeaker which sets a new industry standard in 18" (460 mm) high performance transducers. It has been designed for use as a low bass or sub-woofer component, in either a reflex, bandpass or horn loaded configuration, in high power auditorium or arena loudspeaker systems.
The design has evolved from an extensive research and development program carried out at our own R&D and Engineering facilities near Reggio Emilia. Hence, this transducer provides clean, undistorted low frequency reproduction at very high sound pressure levels and is able to withstand high power levels without damage.
Its design features include a large displacement suspension system which, in conjunction with a carbon fiber reinforced, straight ribbed cone and the Eighteen Sound Double Silicon Spider (DSS), assure an ultra-linear piston action and provide full control across the entire working range.
A new state-of-the-art voice coil based on Eighteen Sound’s Interleaved Sandwich Voice coil (ISV) increases this control, providing high levels of thermal stability and durability. This ISV technology is based on a high strength fiberglas former with half the coil wound on the outside and half on the inside and bonded together using unique high temperature resin adhesives. Hence, a balanced linear motor unit, exerting an exceptionally high force factor is achieved. The low distortion and unmatched sound quality of the 18LW1400 has been significantly improved by the Double Demodulating Rings (DDR) embedded in the pole piece of the magnetic structure. These have been designed to dramatically reduce the intermodulation and harmonic distortion while improving the transient response.
Excellent heat dissipation has been achieved from the special basket design which incorporates air channels between the basket and the magnetic top plate. In addition, 8 air vents incorporated into the back plate are aligned with the voice coil to force air into the lower part of the gap.
Maximum flux density in the gap is assured by the special top and back plate design, resulting in a high BL factor. Due to the increasing use of high power audio systems at outdoor events or in marine environments, the ability of the 18LW1400 to perform properly under inclement weather conditions is a great advantage. This has been achieved using an exclusive cone treatment that improves pulp strength and gives water repellent properties to both sides of the cone. In addition, the special treatment applied to top and back plates of the magnetic structure is far more resistant to the corrosive effects of salts and oxidization than any other treatment in use.

GENERAL SPECIFICATIONS
Nominal Diameter	460 mm (18 in)
Rated Impedance	8 Ohm
Continuous Pink Noise	1000 W
Continuous Power	700 W
Program Power	1400 W
Peak Power	7000 W
Sensitivity	98 dB
Frequency Range	28 - 2500 Hz
Power Compression @-10dB	(70 W) 0,8 dB
Power Compression @-3dB	(350 W) 2,1 dB
Power Compression @Full Power	(700 W) 3,0 dB
Max Recomm. Frequency	500 Hz
Recomm. Enclosure Volume	130 ÷ 350 lt. (4,59 ÷ 12,36 cuft)
Minimum Impedance	6,4 Ohm at 25°C
Max Peak To Peak Excursion	50 mm (1,97 in)
Voice Coil Diameter	100 mm (4 in)
Voice Coil Winding Material	copper
Polarity	positive voltage on red terminal gives forward cone motion

THIELE SMALL PARAMETERS
Fs	31 Hz
Re	5 Ohm
Sd	0,1225 sq. mt. (189,88 sq. in.)
Qms	7,2
Qes	0,31
Qts	0,29
Vas	297 lt. (10,49 cuft)
Mms	190 gr. (0,42 lb)
BL	24,7 Tm
Linear Mathematical Xmax	± 9 mm (± 0,35 in)
Le (1kHz)	2,3 mH
Ref. Efficiency 1W@1m (half space)	96,5 dB

MOUNTING INFORMATIONS
Overall diameter	462 mm (18,18 in)
N. of mounting holes	8
Mounting holes diameter	8,5 mm (0,33 in)
Bolt circle diameter	438-440 mm (17,24-17,32 in)
Front mount baffle cutout ø	416 mm (16,38 in)
Rear mount baffle cutout ø	422 mm (16,61 in)
Total depth	213,9 mm (8,42 in)
Flange and gasket thickness	26 mm (1,02 in)
Net weight	13,3 kg (29,36 lb)
Shipping weight	14,9 kg (32,9 lb)
CardBoard Packaging dimensions	482 x 482 x 257 mm (18,98 x 18,98 x 10,12 in)