18 -sound 18LW1251 / 8 ohm Extended Low Frequency Driver

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The 18LW1250 is a 18 inch (460 mm) high performance extended low
frequency transducer. 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 loudspeaker systems.
18LW1250 design has evolved from extensive research carried out at our
own R&D and Engineering facilities. It provides clean, undistorted
low frequency reproduction at very high levels and is able to withstand
high power without damage.
The transducer design features include
a large displacement suspension system which in conjunction with a high
quality cone and the Eighteen Sound Double Silicon Spider (DSS), assure
a very linear piston action and provide full control across the entire
working range.
This is further improved by a inside outside copper
voice coil, based on our Interleaved Sandwich Voice coil (ISV)
technology. This provides high levels of thermal stability and
durability. The ISV technology is based on a high strength fiberglas
former with half the coil wound on the outside and half on the inside,
bonded together using unique high temperature resin adhesives. The
result is a balanced linear motor exerting a very high force factor.
heat dissipation is derived from a basket design which incorporates air
channels between the basket and the magnetic top plate. In addition,
eight air vents in the back plate, aligned with the voice coil, force
the 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.
to the increasing use of audio systems at outdoor events, the ability
to perform in adverse weather conditions or in areas of high humidity
is a key feature of the 18LW1250. This has been achieved using
exclusive cone treatment and magnetic plate processes which increase
resistance to corrosion and render the cone water repellent.

Key features

    • 98 dB SPL 1W / 1m average sensitivity
    • 100 mm (4 in) Interleaved Sandwich Voice coil (ISV)
    • 1000 W AES power handling
    • Double Silicon Spider (DSS) for improved excursion control and linearity
    • Weather protected cone and plates for outdoor usage
    • Improved heat dissipation via unique basket design and backplate vents
    • Suitable for high SPL subwoofer design


Nominal Diameter 460 mm (18 in)
Rated Impedance 8 Ohm
AES Power 1000 W
Program Power (1) 1400 W
Peak Power (2) 7000 W
Sensitivity (3) 98 dB
Frequency Range (4) 35 – 3500 Hz
Power Compression @-10dB (5) 0,7 dB
Power Compression @-3dB 1,6 dB
Power Compression @Full Power 2,6 dB
Max Recomm. Frequency 500 Hz
Recomm. Enclosure Volume 120 ? 350 lt. (4,24 ? 12,36 cuft)
Minimum Impedance 6,4 Ohm at 25?C
Max Peak To Peak Excursion 36 mm (1,42 in
Voice Coil Diameter 100 mm (4 in)
Voice Coil Winding Material copper
Suspension M-roll. Polycotton
Cone Curvilinear, Paper


Fs 35 Hz
Re 5 Ohm
Sd 0,1134 sq.mt. (175,7 sq.in.)
Qms 8
Qes 0,28
Qts 0,27
Vas 268 lt. (9,47 cuft)
Mms 142 gr. (0,31 lb)
BL 23,6 Tm
Linear Mathematical Xmax (7) ? 9 mm (?0,35 in)
Le (1kHz) 2,73 mH
Ref. Efficiency 1W@1m (half space) 98 dB


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 ? 416 mm (16,38 in)
Rear mount baffle cutout ? 412 mm (16,22 in)
Total depth 207,9 mm (8,18 in)
Flange and gasket thickness 19 mm (0,75 in)
Net weight 13 kg (28,7 lb)
Shipping weight 14,7 kg (32,45 lb)
CardBoard Packaging dimensions 482 x 482 x 257 mm (19 x 19 x 10,1 in)

Extra informatie

Gewicht 14.00 kg



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