18 -sound 12NMB420 High Output MB Neodymium (8 ohm)

Beschrijving

Key features

• • 100,5 dB SPL 1W / 1m average sensitivity
  • 65 mm (2,5 in) Interleaved Sandwich Voice coil (ISV)
  • 300 W AES power handling
  • External neodymium magnet assembly
  • Single Demodulating Ring (SDR) for ultra low distortion
  • Weather protected cone and plates for outdoor usage
  • Specially designed for compact two way systems

Description

The 12NMB420 is a 12 inch neodymium midbass transducer designed for
professional monitoring and sound reinforcement. At the heart of this
speaker is a carefully engineered drive system, designed to assure
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 excursion of the 12NMB420 at these frequencies is much
reduced compared to sealed enclosures, directly reducing harmonic
distortion and the possibility of speaker bottoming. Typical vented
enclosure sizes range from 40lit up with tunings from 50 to 60Hz. Low
frequency equalization is suggested and normally added, in order to
improve the bass output if the system will work without subwoofer. The
recommended amplifier size ranges from 250-500W.
The
onboard copper sleeve positioned in the gap and coupled with SDR
(Single Demodulating Ring) results in optimum balance for reproducing
instantaneous peaks 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.
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
12NMB420 employs a 64mm 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 with reduced tendency to eccentric
behavior when driven hard.