• 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 and reflex subwoofer application
GENERAL SPECIFICATIONS

Nominal diameter 380 mm (15 in)
Rated impedance 8 Ohm
Continuous pink noise (1) 450 W
Continuous power (2) 350 W
Program power (3) 700 W
Peak power (4) 1400 W
Sensitivity (5) 99 dB
Frequency range (6) 40-5000 Hz
Max recomm. frequency 1700 Hz
Recomm. enclosure volume 60-140 lit (2,1-4,9 cuft)
Voice coil diameter 75 mm (3,0 in)
Voice coil winding material aluminium
THIELE SMALL PARAMETERS (7)
Fs 42 Hz
Re 5,6 Ohm
Sd 0,09 sqmt (139,5 sqin)
Qms 6
Qes 0,3
Qts 0,29
Vas 225 lit (7,9 cuft)
Mms 73 gr (161,1 Ib)
BL 19 Tm
Linear Mathematical Xmax (8) ±6.5 mm (±0.26 in)
Le (1 kHz) 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 hole diameter 7,15 mm 0,3 in
Bolt circle diameter 370-371 mm 14.57-14.6 in
Front mount battle cutout diameter 353 mm 13,9 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 Ib
Shipping weight 4,8 kg 10,6 Ib
Cardboard packing dimensions 405x405x214 mm (15.94x15.94x8.43 in)

Key features


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

022158N240
022154N250

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Description
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.

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)