18 Sound 21LW2500 1600watt 8ohm 21" Extended LF Ferrite Subwoofer 8ohm

95 dB SPL 1W / 1m average sensitivity
100 mm (4 in) Interleaved Sandwich Voice coil (ISV)
3200W program power handling
70 mm (2,76 in) peak to peak excursion
Ultra linear dual magnet motor design
Composite reinforced straight ribbed cone
Optimized high grade ferrite magnet assembly
Recommended for subwoofer usage in compact vented enclosures

The Eighteen Sound 21LW2500 is a 21" (533 mm) extended low frequency loudspeaker, designed for use in vented enclosures. The loudspeaker is designed to withstand high power levels without damage while providing clean and undistorted LF reproduction at a very high SPL.
For optimum results we recommend amplifiers able to deliver 3600 Watt program power.
The 21LW2500 features a unique motor featuring a high grade ferrit magnet assembly in a structure optimized for thermal and magnetic efficiency.
21LW2500 features include a large displacement suspension system which, in conjunction with a composite reinforced, straight ribbed cone and the Eighteen Sound proprietary Double Silicon Spider (DSS) technology, allows an ultra-linear piston action and provides full mechanical control across the entire working range.
The 100mm (4 in) state-of-the-art voice-coil utilizing Interleaved Sandwich Voice coil (ISV) technology, provides high levels of thermal stability and durability.
The ISV technology achieves a balanced linear motor unit exerting an exceptionally high force factor.

Model: 18 Sound 21LW2500

note: Price includes VAT

Nominal Diameter 533 mm (21 in)
Rated Impedance 8 Ohm
AES Power 1600 W
Program Power 3200 W
Peak Power 7200 W Sensitivity 95 dB
Frequency Range 30-1000Hz
Power Compression @-10dB 0,57 dB
Power Compression @-3dB 2,1 dB
Power Compression @Full Power 3,2 dB
Max Recomm. Frequency 200 Hz
Recomm. Enclosure Volume 130 - 500 lt (4.59-17.7 cuft)
Minimum Impedance 6,1 Ohm @ 25°
Max Peak To Peak Excursion 70 mm (2,76 in)
Voice Coil Diameter 100 mm (4 in)
Voice Coil winding material Copper wire
Suspension Triple roll, Heavy Polycotton
Cone Curved ribbed fiber loaded cellulose

Thiele Small Parameters

Fs 29 Hz
Re 4,9 Ohm
Sd 0,166 sq.m (175,15 sq.in)
Qms 22
Qes 0,38
Qts 0,37
Vas 305 lt. (10,77 cu.ft)
Mms 380 gr. (0,83 lb)
BL 30 Tm
Linear Mathematical Xmax ±14 mm (±0,55 in)
Le (1kHz) 2,58 mH
Ref. Efficiency 1W@1m (half space) 95,4 dB

Mounting information

Overall diameter 545 mm (21,46 in)
N. of mounting holes and bolt 8
Mounting holes diameter 8,5 mm (0,33 in)
Bolt circle diameter 520 mm (20,47 in)
Front mount baffle cutout ø 492 mm (19,37 in)
Rear mount baffle cutout ø 490 mm (19,29 in)
Total depth 252 mm (9,92 in)
Flange and gasket thickness 18 mm (0,7 in)
Net weight 17,9 kg (39,4 lb)
Shipping weight 19,4 kg (42,7 lb)
Packaging Dimensions 19,4 kg (42,7 lb)