12NDA520 Neodymium LF-MB-MF Transducer KeyFeatures 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 midlow 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. Models Model 12NDA520 Code 12NDA520 Information 12NDA520 Neodymium LF-MB-MF Transducer General Specifications Nominal Diameter Rated Impedance AES Power Program Power Peak Power Sensitivity Frequency Range Power Compression @-10dB Power Compression @-3dB Power Compression @Full Power Max Recomm. Frequency Recomm. Enclosure Volume Minimum Impedance Max Peak To Peak Excursion Voice Coil Diameter Voice Coil Winding Material Suspension Cone 300mm (12 in) 8 Ohm 300W 450W 900W 100,5dB 55 - 6000 Hz 0,7 dB 2,5 dB 3,9 dB 2000 Hz 35 ÷ 80 lt. (12 ÷ 28 cuft) 6,5 Ohm at 25°C 22 mm (0,87 in) 65 mm (2,5 in) aluminum Triple roll, polycotton curvilinear, paper FREQUENCY RESPONSE CURVE OF 12NDA520 MADE ON 50 LIT. ENCLOSURE TUNED 60HZ INFREE FIELD (4PI) ENVIRONMENT. ENCLOSURE CLOSES THE REAR OF THE DRIVER. THE THIN LINE REPRESENTS 45 DEG. OFF AXIS FREQUENCY RESPONSE Thiele Small Parameters Fs Re Sd Qms Qes Qts Vas Mms BL Linear Mathematical Xmax Le (1kHz) Ref. Efficiency 1W@1m (half space) 50 Hz 5,2 Ohm 0,0531 sq.mt. (82,31 sq.in.) 5,5 0,284 0,27 111 lt. (3,9 cuft) 36 gr. (0,08 lb) 14,4 Tm ± 4 mm (±0,16 in) 0,03 mH (AIC on) - 0,57mH (AIC off) 98,9 dB FREE AIR IMPEDANCE MAGNITUDE CURVE - AIC ON Notes 1) AES power is determined according to AES2-1984 (r2003) standard Mounting information Overall diameter N. of mounting holes and bolt Mounting holes diameter Bolt circle diameter Front mount baffle cutout ø Rear mount baffle cutout ø Total depth Flange and gasket thickness Net weight Shipping weight CardBoard Packaging dimensions 315 mm (12,4 in) 8 7,15 mm (0,28 in) 296-300 mm (11,65-11,8 in) 282 mm (11,1 in) 282 mm (11,1 in) 125 mm (4,92 in) 11,5 mm (0,45 in) 2,2 kg (4,86 lb) 3 kg (6,62 lb) 332 x 332 x 184mm (13,07 x 13,07 x 7,24 in) 2) Program power rating is measured in a 50 lit enclosure tuned at 60Hz, using a 60 -2000 Hz band limited pink noise test signal with 50% duty cycle, applied for 2 hours. 3) The peak power rating represents the maximum permitted instantaneous peak power level over a maximum period of 10ms which will be withstood by the loudspeaker without damage. 4) Sensitivity represents the averaged value of acoustic output as measured on the forward central axis of cone, at distance 1m from the baffle panel, when connected to 2,83V sine wave test signal swept between 100Hz and 500Hz with the test specimen mounted in the same enclosure as given for (1) above. 5) Frequency range is given as the band of frequencies delineated by the lower and upper limits where the output level drops by 10 dB below the rated sensitivity in half space environment. 6) Power compression represents the loss of sensitivity for the specified power, measured from 50-500 Hz, after a 5 min pink noise preconditioning test at the specified power. 7) Linear Math. Xmax is calculated as (Hvc-Hg)/2 + Hg/4 where Hvc is the coil depth and Hg is the gap depth.
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