Key Features

• Class D amplifier optimized for maximum power transfer
• Conforms to Powersoft iPal® standards
• 94.2 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

DescriptionThe 21iD is an 21 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 21iD 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 21iD an extremely low distortion, highly dynamic transducer. The 21iD features a state-of-the-art 5,3" inside outside ISV (Interleaved Sandwich Voice-Coil) enabling the 21iD to deliver extraordinary transient results. The 21iD 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.
Date tehnice: General SpecificationsNominal Diameter533 mm (21 in)
Rated Impedance2 Ohm
AES Power1800 W
Program Power3600 W
Peak Power10000 W
Sensitivity94,2 dB
Frequency Range29 ÷ 1600 Hz
Power Compression @-10dB180W 0,7 dB
Power Compression @-3dB900W 1,3 dB
Power Compression @Full Power1800W 2,2 dB
Max Recomm. Frequency150 Hz
Recomm. Enclosure Volume120 ÷ 250 lt. (4,24 ÷ 8,83 cu. ft)
Minimum Impedance2 Ohm
Max Peak To Peak Excursion70 mm (2,76 in)
Voice Coil Diameter135 mm (5,31 in)Voice Coil winding material
Copper
SuspensionTriple Roll, PolycottonConeStraight ribbed carbon fiber loaded celluloseThiele Small ParametersFs38 Hz
Re1,3 Ohm
Sd0,166 sq. m (257,30 sq. in)
Qms5,60
Qes0,24
Qts0,23
Vas143 lt. (5,05 cu. ft)
Mms489 gr. (1,08 lb)
BL25,20 Tm
Linear Mathematical Xmax±14 mm (±0,55 in)
Le (1kHz)1,08 mH
Mounting informationOverall diameter545 mm (21,46 in)
N. of mounting holes and bolt8Mounting holes diameter8,5 mm (0,33 in)Bolt circle diameter520 mm (20,47 in)
Front mount baffle cutout ø492 mm (19,37 in)
Rear mount baffle cutout ø490 mm (19,29 in)
Total depth250 mm (9,84 in)
Flange and gasket thickness18 mm (0,71 in)
Net weight13,6 kg (29,98 lb)
Shipping weight15,1 kg (33,29 lb)
CardBoard Packaging dimensions570x570x290 mm (22,44x22,44x11,42 in)
ModelsModel Code Information21iD022212N0002 Ohm


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