Eighteen Sound |
12NDA520 |
12NDA520-8 |
ALT120520WF08NA |
Cone driver |
|
Brand Eighteen Sound |
Model 12NDA520 |
TLHP code 12NDA520-8 |
Manufacturer code ALT120520WF08NA |
|
Product type Cone driver |
|
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.
100,5 dB SPL 1W / 1m average sensitivity
65 mm (2,52 in) Interleaved Sandwich Voice coil (ISV)
300 W 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
General |
|
Product type | Cone driver |
Brand | Eighteen Sound |
Reference | 12NDA520 |
Product code | ALT120520WF08NA |
Informations |
|
Nominal impedance | 8 ohm |
Dimensional category | 24 inch |
Frequency coverage type | Low |
Manufacturer sensitivity | 100.5 dB |
Calculated sensitivity | 98.8 dB |
Nominal power handling | 300 W |
Max power handling | 450 W |
Bandwidth | 55÷6000 Hz |
Fundamental parameters |
|
Sd | 531 cm² |
Mms | 36 gr |
Cms | 285 µm/N |
Le | 0.03 mH |
Re | 5.2 ohm |
BL | 14.4 T.m |
Small signal parameters |
|
Fs | 50 Hz |
Qes | 0.28 |
Qms | 5.5 |
Qts | 0.27 |
Vas | 111 L |
Datas |
|
Xmax | ±4 mm |
EBP | 179 Hz |
Zmin | 6.5 ohm |
Fs / Qts | 185 Hz |
Vas * Qts² | 8.1 L |
Calculated efficiency | 4.76 % |
Weight | ~2.2 kg |
Dimensions |
|
Voice coil diameter | 2.5 inch |
Outside diameter | 3154 mm |
Baffle cutout diameter | 282 mm |
Depth | 125 mm |
Front thickness | 11 mm |
Depth after front | 114 mm |
Shape & Materials |
|
Front chape | Cylindrical |
Magnet type | Neodymium |
This system is only available for technical questions. For questions of prices, availability of products and deadline thank you to send your request by the contact page.
* Frequency response curve of 12NDA520 made on 50 lit. enclosure tuned 60hz infree field (4π) environment. Enclosure closes the rear of the driver. The thin line represents 45 deg. off axis frequency response.
* Free air impedance magnitude curve.