18s 15NMB420 8 Ohm

18s 15NMB420 8 Ohm
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  • SW10251
The 15NMB420 is a 380 mm (15 in) neodymium mid-bass transducer designed for professional... mehr
Produktinformationen "18s 15NMB420 8 Ohm"
The 15NMB420 is a 380 mm (15 in) neodymium mid-bass transducer designed for professional monitoring and sound reinforcement.
The most extended bass, lowest distortion and best control is usually realized in properly designed vented enclosures. Typical enclosure sizes range from 80lit. up with tunings from 40 to 50Hz.
Low-frequency equalization is suggested in order to improve the bass output. A conservative idea of amplifier size ranges from 400-800W, allowing maximum output with no risk of speaker damage when properly used.
The 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.
SDR (Single Demodulating Ring) technology has been used to reproduce instantaneous peaks on mid frequencies, reducing intermodulation distortion.
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 multiple roll linen suspension designed to control excursion maintaining the piston action linearity.
The 15NMB420 employs a 75mm aluminum 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.


General Specifications

Nominal Diameter 380mm (15 in)
Rated Impedance 8 Ohm
AES Power 450W
Program Power 700W
Peak Power 1400W
Sensitivity 99dB
Frequency Range 40 - 5000 Hz
Power Compression @-10dB 0,7 dB
Power Compression @-3dB 2,1 dB
Power Compression @Full Power 3,4 dB
Max Recomm. Frequency 1700Hz
Recomm. Enclosure Volume 60 - 140 lt. (2,1 - 4,9 cuft)
Minimum Impedance  
Max Peak To Peak Excursion 36 mm (1,4 in)
Voice Coil Diameter 75 mm (3 in)
Voice Coil winding material aluminum
Suspension M-roll, Polycotton
Cone Curvilinear, Treated paper

Thiele Small Parameters

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 ± 6,5 mm (±0,26 in)
Le (1kHz) 0,8 mH
Ref. Efficiency 1W@1m (half space) 99,3 dB

Mounting information

Overall diameter 387 mm (15,2 in)
N. of mounting holes and bolt 8
Mounting holes diameter 7,15 mm (0,3in)
Bolt circle diameter 370-371 mm (14,57-14,61 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)
Packaging Dimensions 405 x 405 x 214 mm(15,94 x 15,94 x 8,43 in)
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