18iD Extended LF Neodymium Transducer

Eighteen Sound - 18iD Extended LF Neodymium Transducer

Code: 18-18id-8


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Product Description

18iD Extended LF Neo Transducer

Key Features

  • Class D amplifier optimized for maximum power transfer
  • Conforms to Powersoft™ iPal® standards
  • 95 dB SPL 1W / 1m average sensitivity
  • 135mm (5.3") split winding, four layer ISV aluminum voice coil
  • 3600 W program power handling
  • Triple Silicon Spider (TSS) for improved excursion control
  • Aluminum demodulating ring (SDR) for lower distortion

The 18iD is an 18 inch neodymium high performance subwoofer. The loudspeaker has been optimized for vented and bandpass subwoofer cabinet designs and is recommended to use a Class D or iPal (tm*) amplifier able to deliver 3600 Watt program power without clipping. Eighteen Sound engineers have obtained the best possible results with today's available materials in terms of clean and undistorted LF reproduction at a ultra high SPL, with the lowest possible power compression figure. The transducer design features include a large displacement suspension system specifically designed for matching the composite fiber reinforced, straight ribbed cone. Thanks to the Triple Silicon Spider (TSS) technology, the 18iD is able to control the moving mass with high linearity, showing an exceptional stability of mechanical parameter values in the long term. Bl force factor, as well as all other electro-dynamic parameters, are linear within the working range. This, together with the exceptional high excursion behavior - 70mm before damage, ±14mm linear Xmax - makes the 18iD an extremely low distortion, highly dynamic transducer. The 18iD features a state-of-the-art 5,3" inside outside ISV (Interleaved Sandwich Voice-Coil) enabling the 18iD to deliver extraordinary transient results. The 18iD has been developed after intense FEA and fluidodynamics simulation and testing,focusing on dissipating the heat generated by the powerful voice coil. Special attention was given to the optimization of air flow into the gap without introducing audible noise. A low density material air diffractor placed into the heatsink acts as a cooling system, increasing the power handling capability and lowering the power compression figure.


Nominal Diameter 460mm (18 in)
Rated Impedance 2 Ohm
AES Power 1800W
Program Power 3600W
Peak Power 10000W
Sensitivity 95 dB
Frequency Range 30 - 2500 Hz
Power Compression @-10dB 0,7 dB
Power Compression @-3dB 1,5 dB
Power Compression @Full Power 2,2 dB
Max Recomm. Frequency 200 Hz
Recomm. Enclosure Volume 110 - 350 lt. (3,89 - 12,36 cuft)
Minimum Impedance 2 Ohm at 25°C
Max Peak To Peak Excursion 70 mm (2,76 in)
Voice Coil Diameter 135 mm (5,31 in)
Voice Coil winding material Copper wire
Suspension Triple Roll, Heavy Polycotton
Cone Straight ribbed carbon fiber loaded cellulose

Thiele Small Parameters

Fs 40 Hz
Re 1,5 Ohm
Sd 0,113 sq.mt. (175.15 sq.in.)
Qms 5,5
Qes 0,27
Qts 0,26
Vas 67 lt. (2,36 cuft)
Mms 420 gr. (0,92 lb)
BL 24 Tm
Linear Mathematical Xmax ±15.5 mm (±0,6 in)
Le (1kHz) 1,22 mH
Ref. Efficiency 1W@1m (half space) 94,2 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 440mm (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 236 mm (9,29 in)
Flange and gasket thickness 26 mm (1,02 in)
Net weight 12,5 kg (27,56 lb)
Shipping weight 14 kg (30,86 lb)
Packaging Dimensions 14 kg (30,86 lb)