18 SOUND 21ID

High Power 21-in LF Neodymium Woofer w/carbon fiber loaded cellulose 2 Ohms
SKU: 21ID
Availability: 19 in stock
Manufacturer: 18 SOUND

* Class D amplifier optimized for maximum power transfer
* Conforms to PowersoftTM iPal standards
* 94.2 dB SPL 1W / 1m average sensitivity
* 135mm (5.3-in) split winding, four layer ISV aluminum voice
* 3600 W program power handling
* Triple Silicon Spider (TSS) for improved excursion control
* Aluminum demodulating ring (SDR) for lower distortion
* Extended LF Neodymium Transducer
* Class D amplifier optimized for maximum power transfer
* Conforms to PowersoftTM iPal standards
* Nominal Diameter 533 mm (21 in)
* Rated Impedance 2 Ohm
* AES Power 1800 W
* Peak Power 10,000 W
* Frequency Range 29 - 1600 Hz
* Power Compression @-10dB 180W 0.7 dB
* Power Compression @-3dB 900W 1.3 dB
* Power Compression @@Full Power 1800W 2.2 dB
* Max Recomm.
Frequency 150 Hz
* Recomm.
Enclosure Volume 120 - 250 It.
(4.24 - 8.83 cu.fh)
* Minimum Impedance 2 Ohm
* Max Peak To Peak Excursion 70 mm (2.76 in)
* Voice Coil Diameter 135 mm (5.31 in)
* Voice Coil winding material Copper
* Suspension Triple Roll.
Polycotton
* Cone Straight ribbed carbon fiber loaded cellulose
* THIELE SMALL PARAMETERS
* Fs 38 Hz
* Re 1.3 Ohm
* Sd 0.166 sq.m (25730 sq.in)
* Qms 5.6
* Qes 0.24
* Qts 0.23
* Vas 143 It.
(5.05 cu.ft)
* Mms 489 gr.
(1.08 Ib)
* BI 25.20 Tm
* Linear Mathematical Xmax +14 mm (+/-0.55 in)
* Le (1kHz) 1.08 mH

* 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 diameter 492 mm (19.37 in)
* Rear mount baffle cutout diameter 490 mm (19.29 in)
* Total depth 250 mm (9.84 in)
* Flange and gasket thickness 18 mm (0.71 in)
* Net weight 13.6 kg (29.98 Ib)
* Shipping weight 15.1 kg (33.29 lb)
* LardBoard Packaging dimensions 570x570x290 mm (22.44x22.44x11.42 in)