18 Sound 21NLW9601C CARBON CONE Extended LF Neodymium Driver 4ohm

(price includes VAT)

95 dB SPL 1W / 1m average sensitivity
135 mm (5.3 in) split winding four layers ISV copper coil
3600 W program power handling
Carbon fiber cone
Triple Silicon Spider (TSS) improves excursion control and linearity even in extreme loading and SPL conditions
Single Demodulating Ring (SDR) for lower distortion
Low noise cooling design for very low power compression
Suitable for Bandpass, Scoop, Bass Reflex and Horn Loaded subwoofer designs

Designed & manufatured in Italy and provided exclusively by Lean Business, this Eighteen Sound speaker comes complete wth 2 years warranty.

See specification tab for technical details or Click HERE for full details, response curves and Thiele & Small parameters. (opens in new window)

Model: 18 Sound 21NLW9601C4

note: Price includes VAT

Nominal Diameter 533mm (21 in)
Rated Impedance 4 Ohm
AES Power 1800W
Program Power 3600W
Peak Power 10000W
Sensitivity 94.5 dB
Frequency Range 33 - 2000 Hz
Power Compression @ -10 dB 0.7 dB
Power Compression @ -3 dB 1.5 dB
Power Compression @ Full Power 2.2 dB
Max Recomm. Frequency 150 Hz
Recomm. Enclosure Volume 120 ÷ 250 lt. (4.24 ÷ 8.83 cuft)
Minimum Impedance 4 Ohm at 25°C
Max Peak To Peak Excursion 70 mm (2,75 in)
Voice Coil Diameter 135 mm (5,3 in)
Voice Coil Technology split winding, 4 layers copper
Suspension Triple Roll, Polycotton
Cone Straight carbon fiber



Fs 38 Hz
Re 2,9 Ohm
Sd 0,1662 sq.mt. (257,6 sq.in.)
Qms 6.28
Qes 0,31
Qts 0,29
Vas 140 lt. (6.18 cuft)
Mms 484 gr. (0,90 lb)
BL 33.20 Tm
Linear Mathematical Xmax ±14 mm (±0.55 in)
Le (1kHz) 1.61 mH
Ref. Efficiency 1W@1m (half space) 94,5 dB



Overall diameter 533 mm (2 in)
N. of mounting holes 8
Mounting holes diameter 8,5 mm (0,33 in)
Bolt circle diameter 520 mm (20,47 in)
Front mount baffle cutout diameter 492 mm (19,37 in)
Rear mount baffle cutout diameter 490 mm (19,29 in)
Total depth 250 mm (9,8 in)
Flange and gasket thickness 18 mm (0,7 in)
Net weight 14 kg (30,9 lb)
Shipping weight 15.1 kg (33.29 lb)
CardBoard Packaging dimensions 570x570x290 mm (22,44x22,44x11,42 in)