Beschrijving
Key features
- 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
Description
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.
The
12ND830 finds its ideal application in compact reflex enclosures where
a considerable amount of low frequencies and low distortion are
required. Its optimum low weight makes it suitable for fixed
installations or portable professional loudspeaker systems.
The
neodymium magnet assembly developed by Eighteen Sound engineers assures
a 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.
The direct
contact between the large heat sink and the specially designed basket,
together with the magnetic structure, represents a fundamental
improvement in thermal connection and heat dissipation. The result is
increased power handling capabilities and lower power compression.
The
deep profile curvilinear cone, made 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 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 75 mm 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 12ND830 far more
resistant to the corrosive effects of salts and oxidization.
| GENERAL SPECIFICATIONS | |
| Nominal Diameter | 300mm (12 in) |
| Rated Impedance | 8 / 4 Ohm |
| AES Power | 450W |
| Program Power (1) | 700W |
| Peak Power (2) | 1500W |
| Sensitivity (3) | 99dB |
| Frequency Range (4) | 53 ? 5000 Hz |
| Power Compression @-10dB (5) | 0,6 dB |
| Power Compression @-3dB | 2,0 dB |
| Power Compression @Full Power | 3,1 dB |
| Max Recomm. Frequency | 2000 Hz |
| Recomm. Enclosure Volume | 40 ? 100 lt. (1,41 ? 3,53 cuft) |
| Minimum Impedance | 7,0 Ohm at 25?C |
| Max Peak To Peak Excursion | 30 mm (1,18 in) |
| Voice Coil Diameter | 75 mm (3 in) |
| Voice Coil Winding Material | aluminum |
| Suspension | M-Roll, Polycotton |
| Cone | Curvilinear, Paper |
| THIELE SMALL PARAMETERS (6) | |
| Fs | 55 Hz |
| Re | 5,7 Ohm |
| Sd | 0,0531 sq.mt. (82,31 sq.in.) |
| Qms | 5,15 |
| Qes | 0,296 |
| Qts | 0,28 |
| Vas | 72 lt. (2,54cuft) |
| Mms | 46 gr. (0,10 lb) |
| BL | 17,6 Tm |
| Linear Mathematical Xmax (7) | ? 6,5 mm (? 0,26 in) |
| Le (1kHz) | 1,5 mH |
| Ref. Efficiency 1W@1m (half space) | 98,3 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 | 140 mm (5,52 in) |
| Flange and gasket thickness | 11,5 mm (0,45 in) |
| Net weight | 4 kg (8,83 lb) |
| Shipping weight | 4,8 kg (10,6 lb) |
| CardBoard Packaging dimensions | 332 x 332 x 184 mm(13,07 x 13,07 x 7,24 in) |
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