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18ND930 /8

18ND930 /8

£199.95
Item is in stock

Description

Description

The 18ND930 is a low frequency loudspeaker which meets demand for high linearity and high efficiency. It can be used as a low bass or subwoofer component in either reflex or bandpass configuration, thanks to its very high BL factor for a 3" voice coil transducer. The 18ND930 is suitable for fixed or touring loudspeaker systems due to
its light weight. The clean, linear low frequency reproduction also make it suitable for bass musical instrument applications.
The neodymium magnet assembly, developed by Eighteen Sound engineers, assures high flux concentration, low power compression and excellent heat exchange because the external magnet configuration is considerably more efficient than traditional under-pole magnet topology. This results in high levels of force factor and power handling with an optimum power to weight ratio.
The direct contact between the large heat sink and specially designed basket, together with the magnetic structure, represents a fundamental improvement in thermal connection and heat dissipation. This increases the power handling capabilities and lowers the power compression.
The curvilinear paper cone is created from a special high strength wood pulp to achieve the best possible linearity within its intended frequency range and to control bell-mode resonance around the cone circumference. The cone is carried by a double half-roll suspension built in a linen-like material, which is more resistant to aging and
fatigue than traditional cotton based materials used in conventional surrounds.
The 75mm edge-wound state-of-the-art voice coil assembly is wound on a strong fiberglas former to improve force transmission and power handling.
The already low distortion and sound quality are further improved using Double Demodulating Rings (DDR) that flatten impedance and phase through constant power transfer.
A proprietary humidity-block cone treatment makes the transducer suitable for outdoor use in adverse weather conditions. In addition, a special coating applied to both the top and back plates makes the 18ND930 far more resistant to the corrosive effects of salts and oxidization.

General Specifications

Nominal Diameter 460mm (18 in)
Rated Impedance 8 Ohm
AES Power 500W
Program Power 800W
Peak Power 1600W
Sensitivity 99 dB
Frequency Range 35 - 3800 Hz
Power Compression @-10dB 0,6 dB
Power Compression @-3dB 1,9 dB
Power Compression @Full Power 2,8 dB
Max Recomm. Frequency 500 Hz
Recomm. Enclosure Volume 90 - 200 lt. (3,18 - 7,06 cu ft)
Minimum Impedance
Max Peak To Peak Excursion 34 mm (1,34 in)
Voice Coil Diameter 75 mm (2,95 in)
Voice Coil winding material copper
Suspension Double roll, treated polycotton
Cone Curvilinear treated paper

Thiele Small Parameters

Fs 33 Hz
Re 5,5 Ohm
Sd 0,1133 sq.mt. (175,7 sq.in.)
Qms 7,65
Qes 0,29
Qts 0,28
Vas 316 lt. (11,16 cuft)
Mms 133 gr. (0,29 lb)
BL 22 Tm
Linear Mathematical Xmax ±7,5 mm (±0,3 in)
Le (1kHz) 1,7 mH
Ref. Efficiency 1W@1m (half space) 97,8 dB

Mounting information

Overall diameter 462 mm (18,19 in)
N. of mounting holes and bolt 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 412 mm (16,22 in)
Total depth 201,5 mm (7,93 in)
Flange and gasket thickness 19 mm (0,75 in)
Net weight 5,9 kg (13,02 lb)
Shipping weight 7,3 kg (16,1 lb)
Packaging Dimensions 482x482x257 mm (18,98x18,98x10,12 in)

Features

  • Model: 18ND930
  • Shipping Weight: 7.3kg
  • 10 Units in Stock
  • Manufactured by: 18 Sound

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