SPEAKER 18SOUND 15" 15ND830

The 15ND830 is a high power, high output, low frequency woofer meeting the most stringent requirements in high quality professional transducers. Thanks to its versatility, the 15ND830 can be used in 2-way compact reflex enclosures and reflex / band pass subwoofers. The neodymium magnet assembly 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 direct contact between the heat sink and basket, together with the magnetic structure, represents a fundamental improvement in thermal connection and heat dissipation. Hence, power handling capabilities are increased and power compression lowered. The deep profile curvilinear cone, created from a special high strength wood pulp, has been designed to achieve the best possible linearity within its frequency range. The cone surround made from a linen material is highly resistant to aging and fatigue. The in-house developed cone treatment is fully water repellent and also gives a significant degree of rigidity to the cone. The 75mm Interleaved Sandwich Voice coil (ISV) assembly is wound on a strong fiberglas former which improves force transmission and thermal power handling. A special coating applied to both the top and back plates makes the 15ND830 far more resistant to the corrosive effects of salts and oxidization.

The 12ND830 is a 300mm (12 in) neodymium Mid-bass transducer, and differs from the 12ND930 in the wire conception, offering a lighter speaker with a lower force factor.
99 dB SPL 1W / 1m average sensitivity
75 mm (3 in) Interleaved Sandwich Voice coil (ISV)
450 W AES power handling
Neodymium magnet assembly
Ideal for compact reflex enclosures and two-way systems

General

Product type    Cone driver
Brand    Eighteen Sound
Reference    12ND830
Product code    ALT120830WF08NA - 022128N210

Informations

Nominal impedance    8 ohm
Dimensional category    12.5 inch
Frequency coverage type    Low, Midbass, Midrange
Manufacturer sensitivity    99 dB
Calculated sensitivity    97.86 dB
Nominal power handling    450 W
Max power handling    700 W
Bandwidth    53÷5000 Hz

Fundamental parameters

Sd    531 cm²
Mms    46 gr
Cms    184 µm/N
Le    1.5 mH
Re    5.7 ohm
BL    17.6 T.m

Small signal parameters

Fs    55 Hz
Qes    0.3
Qms    5.15
Qts    0.28
Vas    72 L

Datas

Xmax    ±6.5 mm
EBP    183 Hz
Zmin    7 ohm
Fs / Qts    196 Hz
Vas * Qts²    5.65 L
Calculated efficiency    3.84 %
Weight    ~4 kg

Dimensions

Voice coil diameter    3 inch
Outside diameter    315 mm
Baffle cutout diameter    282 mm
Depth    140 mm
Front thickness    9 mm
Depth after front    131 mm

Shape & Materials

Front chape    Cylindrical
Magnet type    Neodymium