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18 Sound 12ND830 B - Versiune speciala, ideala pentru boxe gen VL212 ,VL112 FX12 sau echivalente
- 99 dB SPL 1W / 1m average sensitivity
- 75 mm (3 in) Interleaved Sandwich Voice coil (ISV)
- 450 W AES power handling
- Neodymium magnet assembly
- Ideal for compact reflex enclosures and two-way systems
DescriptionThe 12ND830 is a 300mm (12 in) neodymium Mid-bass transducer, and differs from the 12ND930 in the wire conception, offering a lighter speaker with a lower force factor. The 12ND830 finds its ideal application in compact reflex enclosures where a considerable amount of low frequencies and low distortion are required. Its optimum low weight makes it suitable for fixed installations or portable professional loudspeaker systems. The neodymium magnet assembly developed by Eighteen Sound engineers assures a high flux concentration, low power compression and excellent heat exchange since the external magnet configuration is considerably more efficient than traditional under-pole magnet topology. The direct contact between the large heat sink and the specially designed basket, together with the magnetic structure, represents a fundamental improvement in thermal connection and heat dissipation. The result is increased power handling capabilities and lower power compression. The deep profile curvilinear cone, made from a special high strength wood pulp, has been designed to achieve the best possible linearity within its frequency range. The cone surround, made from linen material is highly resistant to aging and fatigue. The in-house developed cone treatment is fully water repellent and also gives a significant degree of rigidity to the cone. The 75 mm Interleaved Sandwich Voice coil (ISV) assembly is wound on a strong fiberglas former which improves force transmission and thermal power handling. A special coating applied to both the top and back plates makes the 12ND830 far more resistant to the corrosive effects of salts and oxidization.
Nominal Diameter 300mm (12 in) Rated Impedance 8 Ohm AES Power 450W Program Power 700W Peak Power 1500W Sensitivity 99dB Frequency Range 53 ÷ 5000 Hz Power Compression @-10dB 0,6 dB Power Compression @-3dB 2,0 dB Power Compression @Full Power 3,1 dB Max Recomm. Frequency 2000 Hz Recomm. Enclosure Volume 40 ÷ 100 lt. (1,41 ÷ 3,53 cuft) Minimum Impedance 7,0 Ohm at 25°C Max Peak To Peak Excursion 30 mm (1,18 in) Voice Coil Diameter 75 mm (3 in) Voice Coil Winding Material aluminum Suspension M-Roll, Polycotton Cone Curvilinear, Paper
Thiele Small Parameters
Fs 55 Hz Re 5,7 Ohm Sd 0,0531 sq.mt. (82,31 sq.in.) Qms 5,15 Qes 0,296 Qts 0,28 Vas 72 lt. (2,54cuft) Mms 46 gr. (0,10 lb) BL 17,6 Tm Linear Mathematical Xmax ± 6,5 mm (± 0,26 in) Le (1kHz) 1,5 mH Ref. Efficiency 1W@1m (half space) 98,3 dB
Overall diameter 315 mm (12,4 in) N. of mounting holes and bolt 8 Mounting holes diameter 7,15 mm (0,28 in) Bolt circle diameter 296-300 mm (11,65-11,8 in) Front mount baffle cutout ø 282 mm (11,1 in) Rear mount baffle cutout ø 282 mm (11,1 in) Total depth 140 mm (5,52 in) Flange and gasket thickness 11,5 mm (0,45 in) Net weight 4 kg (8,83 lb) Shipping weight 4,8 kg (10,6 lb) CardBoard Packaging dimensions 332 x 332 x 184 mm(13,07 x 13,07 x 7,24 in)
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