0004 18LW1400 - Eighteen Sound
18LW1400
Extended LF Ferrite Transducer
KeyFeatures
98 dB SPL 1W / 1m average sensitivity
100 mm (4 in) Interleaved Sandwich Voice coil (ISV)
1000W AES power handling
Carbon fiber reinforced straight ribbed cone
Double Silicon Spider (DSS) for improved excursion control and linearity
Double Demodulating Rings (DDR) for lower distortion
Improved heat dissipation via unique basket design and multiple backplate vents
Weather protected cone and plates for outdoor usage
Ideal for high SPL subwoofer designs
Description
The 18LW1400 is an extended low frequency loudspeaker which sets an industry standard in 18"
(460 mm) high performance transducers. It has been designed for use as a low bass or subwoofer component, in either a reflex, bandpass or horn loaded configuration, in high power
auditorium or arena loudspeaker systems. The transducer provides clean, undistorted low
frequency reproduction at very high sound pressure levels and is able to withstand high power
levels without damage. 18LW1400 design features include a large displacement suspension
system which, in conjunction with a carbon fiber reinforced, straight ribbed cone and the Double
Silicon Spider (DSS), assure an ultra-linear piston action and provide full control across the entire
working range. A 100mm copper voice coil based on Interleaved Sandwich Voice coil (ISV)
technology increases this control, providing high levels of thermal stability and durability. 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 top
and back plate design, resulting in a high BL factor. 18LW1400 is able to perform properly under
inclement weather conditions. The exclusive cone treatment 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.
Models
Model
0221883110
0221843110
Code
0221883110
0221843110
Information
8 Ohm
4 Ohm
18LW1400
Extended LF Ferrite Transducer
General Specifications
Nominal Diameter
Rated Impedance
AES Power
Program Power
Peak Power
Sensitivity
Frequency Range
Power Compression @-10dB
Power Compression @-3dB
Power Compression @Full Power
Max Recomm. Frequency
Recomm. Enclosure Volume
Minimum Impedance
Max Peak To Peak Excursion
Voice Coil Diameter
Voice Coil Winding Material
Suspension
Cone
460 mm (18 in)
8 Ohm
1000 W
1400 W
7000 W
98 dB
28 - 2500 Hz
0,8 dB
2,1 dB
3,0 dB
150 Hz
130 ÷ 350 lt. (4,59 ÷ 12,36 cuft)
6,4 Ohm at 25°C
50 mm (1,97 in)
100 mm (4 in)
copper
Triple roll, Polycotton
Straight Ribbed, carbon fiber reinforced paper
FREQUENCY RESPONSE CURVE OF 18LW1400 MADE ON 180 LIT. ENCLOSURE TUNED 35HZ
IN FREE FIELD (4PI) ENVIRONMENT. ENCLOSURE CLOSES THE REAR OF THE DRIVER. THE
THIN LINE REPRESENTS 45 DEG. OFF AXIS FREQUENCY RESPONSE.
Thiele Small Parameters
Fs
Re
Sd
Qms
Qes
Qts
Vas
Mms
BL
Linear Mathematical Xmax
Le (1kHz)
Ref. Efficiency 1W@1m (half space)
31 Hz
5 Ohm
0,1225 sq. mt. (189,88 sq. in.)
7,2
0,31
0,29
297 lt. (10,49 cuft)
190 gr. (0,42 lb)
24,7 Tm
± 9 mm (± 0,35 in)
2,3 mH
96,5 dB
Mounting information
Overall diameter
N. of mounting holes and bolt
Mounting holes diameter
Bolt circle diameter
Front mount baffle cutout ø
Rear mount baffle cutout ø
Total depth
Flange and gasket thickness
Net weight
Shipping weight
CardBoard Packaging dimensions
462 mm (18,18 in)
8
8,5 mm (0,33 in)
438-440 mm (17,24-17,32 in)
416 mm (16,38 in)
422 mm (16,61 in)
215,4 mm (8,48 in)
26 mm (1,02 in)
13,3 kg (29,36 lb)
14,9 kg (32,9 lb)
482 x 482 x 257 mm (19 x 19 x 10,1 in)
FREE AIR IMPEDANCE MAGNITUDE CURVE
Notes
1) AES power is determined according to AES2-1984 (r2003) standard
2) Program power rating is measured in 180 lit enclosure tuned 35Hz using a 40 - 400Hz band
limited pink noise test signal with 50% duty cycle, applied for 2 hours.
3) The peak power rating represents the maximum permitted instantaneous peak power level
over a maximum period of 10ms which will be withstood by the loudspeaker without damage.
4) Sensitivity represents the averaged value of acoustic output as measured on the forward
central axis of cone, at distance 1m from the baffle panel, when connected to 2,83V sine wave
test signal swept between 100Hz and 500Hz with the test specimen mounted in the same
enclosure as given for (1) above.
5) Frequency range is given as the band of frequencies delineated by the lower and upper limits
where the output level drops by 10 dB below the rated sensitivity in half space environment.
6) Power compression represents the loss of sensitivity for the specified power, measured from
50-500 Hz, after a 5 min pink noise preconditioning test at the specified power.
7) Linear Math. Xmax is calculated as (Hvc-Hg)/2 + Hg/4 where Hvc is the coil depth and Hg is the
gap depth.
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