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18 Sound 18ND9300
Art.Nr.: 18S18ND9300
18-Sound 18ND9300 Extended LF Neodymium Treiber
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Hersteller:
Eighteensound
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18 Sound 18ND9300
SMALL SPECIFICATIONS
98 dB SPL 1W / 1m average sensitivity 100 mm (4 in) Interleaved Sandwich Voice coil (ISV) 1000 W continuous pink noise power handling Neodymium magnet assembly Weather protected cone and plates for outdoor usage Double Silicon Spider (DSS) for improved excursion control and linearity Double Demodulating Rings (DDR) for lower distortion and improved heat dissipation Improved heat dissipation via unique basket design and finned rear cover
The 18ND9300 is an extended low frequency loudspeaker which sets a new industry standard in 18" (460 mm) neodymium high performance transducers. The speaker has been derived from our flagship 18LW1400, after in-depth studies on magnetic circuit design, which focused on dissipating the heat generated by the powerful 4" coil.
The loudspeaker design provides clean and undistorted LF reproduction at a very high SPL and enables the speaker to withstand high power levels without damage.
The neo magnet assembly assures high flux concentration, low power compression and excellent heat exchange. The external magnet configuration is considerably more efficient than traditional under-pole magnet topology. This results in high levels of force factor and power handling with an optimum power to weight ratio.
The heatsink has been specifically studied using F.E.A. simulators and the necessary heat transfer to the dissipative structure has been improved. The heat sink concept has been further improved by using an air-diffractor that offers high thermal capacity and has been designed to force air moved by the dust cap through the heat sink fins and cool it down. The direct contact between the heat sink and the specially designed basket, together with the magnetic structure, represents a fundamental improvement in heat dissipation, increasing power handling capabilities and lowering power compression figure.
18ND9300 design features include an exceptional displacement suspension system which, in conjunction with a carbon fibre reinforced, straight ribbed cone and a Double Silicon Spider (DSS), result in an ultra-linear piston action, providing full control across the entire working range.
The state-of-the-art voice coil, based on 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. This is realised through a high strength fiberglas former with half the coil wound half on the outside and half on the inside and bonded together using unique high-temperature resin adhesives.
The low distortion and unmatched sound quality of the 18ND9300 have been further improved by Double Demodulating Rings (DDR) embedded in the pole piece of the magnetic structure.
A proprietary humidity-block cone treatment makes the transducer suitable for outdoor use in adverse weather conditions. In addition, a special coating applied to both the top and back plates makes the 18ND9300 far more resistant to the corrosive effects of salts and oxidization.
SMALL SPECIFICATIONS
| GENERAL SPECIFICATIONS | |
| Nominal Diameter | 460mm (18 in) |
| Rated Impedance | 8 ohms |
| Continuous Pink Noise (1) | 1000W |
| Continuous Power (2) | 700W |
| Program Power (3) | 1400W |
| Peak Power (4) | 7000W |
| Sensitivity (5) | 98 dB |
| Frequency Range (6) | 28 - 2500 Hz |
| Power Compression @ -10 dB (7) | (70 W) 0,8 dB |
| Power Compression @ -3 dB (8) | (350 W) 2,1 dB |
| Power Compression @ Full Power (9) | (700 W) 3,2 dB |
| Max Recomm. Frequency | 500 Hz |
| Recomm. Enclosure Volume | 100 ÷ 300 lt. (3,53 ÷ 10,6 cuft) |
| Minimum Impedance | 6,3 ohms at 25°C |
| Max Peak To Peak Excursion | 50 mm (1,97 in) |
| Voice Coil Diameter | 100 mm (4 in) |
| Voice Coil Winding Material | copper |
| Polarity | positive voltage on red terminal gives forward cone motion |
| THIELE SMALL PARAMETERS (10) | |
| Fs | 30 Hz |
| Re | 5 ohms |
| Sd | 0,1225 sq.mt. (189,88 sq.in.) |
| Qms | 7,86 |
| Qes | 0,29 |
| Qts | 0,28 |
| Vas | 316 lt. (11,16 cuft) |
| Mms | 184 gr. (0,41 lb) |
| BL | 24,4 Tm |
| Linear Mathematical Xmax (11) | ±9,5 mm (±0,37 in) |
| Le (1kHz) | 2,02 mH |
| Ref. Efficiency 1W@1m (half space) | 96,7 dB |
| MOUNTING INFORMATIONS | |
| Overall diameter | 462 mm (18,19 in) |
| N. of mounting holes | 8 |
| Mounting holes diameter | 8,5 mm (0,33 in) |
| Bolt circle diameter | 438-440 mm (17,24-17,32 in) |
| Front mount baffle cutout diameter | 416 mm (16,38 in) |
| Rear mount baffle cutout diameter | 422 mm (16,61 in) |
| Total depth | 223,5 mm (8,8 in) |
| Flange and gasket thickness | 26 mm (1,02 in) |
| Net weight | 7,6 kg (16,78 lb) |
| Shipping weight | 9 kg (19,78 lb) |
| CardBoard Packaging dimensions | 482x482x257 mm (18,98x18,98x10,12 in) |
The 18ND9300 is an extended low frequency loudspeaker which sets a new industry standard in 18" (460 mm) neodymium high performance transducers. The speaker has been derived from our flagship 18LW1400, after in-depth studies on magnetic circuit design, which focused on dissipating the heat generated by the powerful 4" coil.
The loudspeaker design provides clean and undistorted LF reproduction at a very high SPL and enables the speaker to withstand high power levels without damage.
The neo magnet assembly assures high flux concentration, low power compression and excellent heat exchange. The external magnet configuration is considerably more efficient than traditional under-pole magnet topology. This results in high levels of force factor and power handling with an optimum power to weight ratio.
The heatsink has been specifically studied using F.E.A. simulators and the necessary heat transfer to the dissipative structure has been improved. The heat sink concept has been further improved by using an air-diffractor that offers high thermal capacity and has been designed to force air moved by the dust cap through the heat sink fins and cool it down. The direct contact between the heat sink and the specially designed basket, together with the magnetic structure, represents a fundamental improvement in heat dissipation, increasing power handling capabilities and lowering power compression figure.
18ND9300 design features include an exceptional displacement suspension system which, in conjunction with a carbon fibre reinforced, straight ribbed cone and a Double Silicon Spider (DSS), result in an ultra-linear piston action, providing full control across the entire working range.
The state-of-the-art voice coil, based on 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. This is realised through a high strength fiberglas former with half the coil wound half on the outside and half on the inside and bonded together using unique high-temperature resin adhesives.
The low distortion and unmatched sound quality of the 18ND9300 have been further improved by Double Demodulating Rings (DDR) embedded in the pole piece of the magnetic structure.
A proprietary humidity-block cone treatment makes the transducer suitable for outdoor use in adverse weather conditions. In addition, a special coating applied to both the top and back plates makes the 18ND9300 far more resistant to the corrosive effects of salts and oxidization.
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