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

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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.

GENERAL SPECIFICATIONS
Nominal Diameter 300mm (12 in)
Rated Impedance 8 Ohm
AES Power 300W
Program Power (1) 450W
Peak Power (2) 900W
Sensitivity (3) 100,5dB
Frequency Range (4) 55 – 6000 Hz
Power Compression @-10dB (5) 0,7 dB
Power Compression @-3dB 2,5 dB
Power Compression @Full Power 3,9 dB
Max Recomm. Frequency 2000 Hz
Recomm. Enclosure Volume 35 ? 80 lt. (12 ? 28 cuft)
Minimum Impedance 6,5 Ohm at 25?C
Max Peak To Peak Excursion 22 mm (0,87 in)
Voice Coil Diameter 65 mm (2,5 in)
Voice Coil Winding Material aluminum
Suspension Triple roll, polycotton
Cone curvilinear, paper

 

THIELE SMALL PARAMETERS (6)
Fs 50 Hz
Re 5,2 Ohm
Sd 0,0531 sq.mt. (82,31 sq.in.)
Qms 5,5
Qes 0,284
Qts 0,27
Vas 111 lt. (3,9 cuft)
Mms 36 gr. (0,08 lb)
BL 14,4 Tm
Linear Mathematical Xmax (7) ? 4 mm (?0,16 in)
Le (1kHz) 0,03 mH (AIC on) – 0,57mH (AIC off)
Ref. Efficiency 1W@1m (half space) 98,9 dB

 

MOUNTING INFORMATIONS
Overall diameter 315 mm (12,4 in)
N. of mounting holes 8
Mounting holes diameter 7,15 mm (0,28 in)
Bolt circle diameter 296-300 mm (11,65-11,8 in)
Front mount baffle cutout ? 282 mm (11,1 in)
Rear mount baffle cutout ? 282 mm (11,1 in)
Total depth 125 mm (4,92 in)
Flange and gasket thickness 11,5 mm (0,45 in)
Net weight 2,2 kg (4,86 lb)
Shipping weight 3 kg (6,62 lb)
CardBoard Packaging dimensions 332 x 332 x 184mm (13,07 x 13,07 x 7,24 in)

Extra informatie

Gewicht 4.00 kg

Merk

18-Sound

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