18 -sound 12NDA520 High Output MB Neodymium (8 ohm)

Beschrijving

Key features

• • 100,5 dB SPL 1W / 1m average sensitivity
  • 65 mm (2,52 in) Interleaved Sandwich Voice coil (ISV)
  • 300W AES power handling
  • Neodymium magnet assembly
  • AIC
    (Active Impedance Control) secondary voice coil for superior
    intelligibility, very low distortion and inductance linearization
  • Suitable for two way high quality applications

Description

The 12NDA520 is a 12″ mid-low transducer created for compact reflex
2-way enclosures and designed to be coupled with typical 1″ and 1.4″
compression drivers. It can also be used in mid-low applications on
modern line-array systems.
Its
features and design characteristics make it extremely defined in
mid-range frequencies and offer a significant and consistent
bottom-end, making the product also suitable for monitoring
applications. The 12NDA520 incorporates our proprietary Active
Impedance Control technology (AIC), consisting of an additional coil
fixed on the pole piece and connected in parallel to the moving coil.
The magnetic field generated by this coil has the following effects:
1) Impedance linearization
2) Acoustic and electric phase linearization
3) Significant increase of sensitivity and total SPL
4) Total harmonic distortion reduction
5) Constant power transfer
By not absorbing the moving coil?s electromagnetic energy, AIC offers substantial advantages relating to the quality of sound.
The
neodymium magnet assembly developed by Eighteen Sound engineers assures
high flux concentration, low power compression and excellent heat
exchange since 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 curvilinear cone, created from a high damping
wood pulp, has been designed to achieve the best possible linearity
within its intended frequency range.
The 12NDA520 employs our
Interleaved Sandwich Voice coil (ISV) technology in which a high
strength fiberglas former carries windings on both the outer and inner
surfaces to achieve a mass balanced coil. The final result is an
extremely linear motor assembly with a reduced tendency for eccentric
behavior when driven hard.
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 12NDA520 far more resistant to the
corrosive effects of salts and oxidization.