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18 Sound 15NMB420
Art.Nr.: 18S15NMB420
18-Sound 15NMB420 High Output MB Neodymium Treiber
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Hersteller:
Eighteensound
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18 Sound 15NMB420
SMALL SPECIFICATIONS
99 dB SPL 1W / 1m average sensitivity 75 mm (3 in) Interleaved Sandwich Voice coil (ISV) 450 W continuous pink noise power handling External neodymium magnet assembly Single Demodulating Rings (SDR) for lower distortion Weather protected cone and plates for outdoor usage Specially designed for compact two way systems
The 15NMB420 is a 15" midbass transducer designed for professional monitoring and sound reinforcement. At the heart of this speaker is a carefully engineered drive system. Its design assures linear, low-distortion output, high power capability and efficient heat transfer. The most extended bass, lowest distortion and best control is usually realized in properly designed vented enclosures. In such designs, the vent, or port, actually provides the lowest octave of output. The vent is driven to full acoustic output by a relatively small motion of the speaker cone itself, acting through the air contained within the enclosure. The excursion of the 15NMB420 at these frequencies is much reduced compared to sealed enclosures, directly reducing harmonic distortion and the possibility of speaker bottoming. Typical enclosure sizes range from 80lit. up with tunings from 40 to 50Hz; low-frequency equalization is suggested and normally added in order to improve the bass output. Speaker applications are from subwoofers to 2 way systems. A conservative idea of amplifier size ranges from 400-800W. Amplifiers of this size will allow maximum output with minimal risk of speaker damage when properly used.
Incorporated into the design is the SDR(Single Demodulating Ring), used to reproduce instantaneous peak on mid frequencies, reducing intermodulation distortion.
The external magnet typology neodymium magnet assembly assures high flux concentration, low power compression and excellent heat exchange, since the external magnet configuration is considerably more efficient than the traditional under-pole magnet topology. This allows to obtain high levels of force factor and power handling with a power to weight ratio at the upper level of the category.
The high quality paper cone has a smooth, curvilinear profile design that eliminates bell-mode resonances within the intended frequency range. This is carried by a specially treated and damped double triple-roll linen suspension designed to control excursion maintaining the piston action linearity.
The 15NMB420 employs a 75mm Interleaved Sandwich Voice coil (ISV), in which a high strength fiberglass former carries windings on both the outer and inner surfaces to achieve a mass balanced coil, resulting in an extremely linear motor assembly.
A proprietary humidity-block cone treatment has been implemented in order to perform in outdoor environments under adverse weather conditions. In addition, special treatment of both the face and back plates results in a product which is far more resistant to the corrosive effects of salts and oxidization than any other treatment in use.
SMALL SPECIFICATIONS
| GENERAL SPECIFICATIONS | |
| Nominal Diameter | 380mm (15 in) |
| Rated Impedance | 8 Ohm |
| Continuous Pink Noise (1) | 450W |
| Continuous Power (2) | 350W |
| Program Power (3) | 700W |
| Peak Power (4) | 1400W |
| Sensitivity (5) | 99dB |
| Frequency Range (6) | 40 - 5000 Hz |
| Power Compression @-10dB (7) | (35 W) 0,7 dB |
| Power Compression @-3dB | (175 W) 2,1 dB |
| Power Compression @Full Power | (350 W) 3,4 dB |
| Max Recomm. Frequency | 1700Hz |
| Recomm. Enclosure Volume | 60 ÷ 140 lt. (2,1 ÷ 4,9 cuft) |
| Minimum Impedance | 6,9 Ohm at 25°C |
| Max Peak To Peak Excursion | 36 mm (1,4 in) |
| Voice Coil Diameter | 75 mm (3 in) |
| Voice Coil Winding Material | aluminum |
| THIELE SMALL PARAMETERS (8) | |
| Fs | 42 Hz |
| Re | 5,6 Ohm |
| Sd | 0,09 sq.mt. (139,5 sq.in.) |
| Qms | 6 |
| Qes | 0,3 |
| Qts | 0,29 |
| Vas | 225 lt. (7,9 cuft) |
| Mms | 73gr. (161,1 lb) |
| BL | 19 Tm |
| Linear Mathematical Xmax (9) | ± 6,5 mm (±0,26 in) |
| Le (1kHz) | 0,8 mH |
| Ref. Efficiency 1W@1m (half space) | 99,3 dB |
| MOUNTING INFORMATIONS | |
| Overall diameter | 387 mm (15,2 in) |
| N. of mounting holes | 8 |
| Mounting holes diameter | 7,15 mm (0,3in) |
| Bolt circle diameter | 370-371 mm (14,57-14,6 in) |
| Front mount baffle cutout ø | 353mm (13,9 in) |
| Rear mount baffle cutout ø | 357 mm (14,1 in) |
| Total depth | 169,5 mm (6,7 in) |
| Flange and gasket thickness | 11,5 mm (0,5 in) |
| Net weight | 3,9 kg (8,6 lb) |
| Shipping weight | 4,8 kg (10,6 lb) |
| CardBoard Packaging dimensions | 405 x 405 x 214 mm(15,94 x 15,94 x 8,43 in) |
The 15NMB420 is a 15" midbass transducer designed for professional monitoring and sound reinforcement. At the heart of this speaker is a carefully engineered drive system. Its design assures linear, low-distortion output, high power capability and efficient heat transfer. The most extended bass, lowest distortion and best control is usually realized in properly designed vented enclosures. In such designs, the vent, or port, actually provides the lowest octave of output. The vent is driven to full acoustic output by a relatively small motion of the speaker cone itself, acting through the air contained within the enclosure. The excursion of the 15NMB420 at these frequencies is much reduced compared to sealed enclosures, directly reducing harmonic distortion and the possibility of speaker bottoming. Typical enclosure sizes range from 80lit. up with tunings from 40 to 50Hz; low-frequency equalization is suggested and normally added in order to improve the bass output. Speaker applications are from subwoofers to 2 way systems. A conservative idea of amplifier size ranges from 400-800W. Amplifiers of this size will allow maximum output with minimal risk of speaker damage when properly used.
Incorporated into the design is the SDR(Single Demodulating Ring), used to reproduce instantaneous peak on mid frequencies, reducing intermodulation distortion.
The external magnet typology neodymium magnet assembly assures high flux concentration, low power compression and excellent heat exchange, since the external magnet configuration is considerably more efficient than the traditional under-pole magnet topology. This allows to obtain high levels of force factor and power handling with a power to weight ratio at the upper level of the category.
The high quality paper cone has a smooth, curvilinear profile design that eliminates bell-mode resonances within the intended frequency range. This is carried by a specially treated and damped double triple-roll linen suspension designed to control excursion maintaining the piston action linearity.
The 15NMB420 employs a 75mm Interleaved Sandwich Voice coil (ISV), in which a high strength fiberglass former carries windings on both the outer and inner surfaces to achieve a mass balanced coil, resulting in an extremely linear motor assembly.
A proprietary humidity-block cone treatment has been implemented in order to perform in outdoor environments under adverse weather conditions. In addition, special treatment of both the face and back plates results in a product which is far more resistant to the corrosive effects of salts and oxidization than any other treatment in use.
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18 Sound 15NMB420
Art.Nr.: 18S15NMB420
18 Sound 15NMB420Art.Nr.: 18S15NMB420
18-Sound 15NMB420 High Output MB Neodymium Treiber
SMALL SPECIFICATIONS 99 dB SPL 1W / 1m average sensitivity 75 mm (3 in) Interleaved Sandwich Voice coil (ISV) 450 W continuous pink noise...
Artikel 40 / 61