Eighteen Sound 6NMB420 6" High Output Mid-Bass Neodymium Transducer 500 Watts
Product Highlights
- The 6NMB420 is a 44mm voice coil 6.5 inch neodymium midbass transducer designed for mid low frequency reproduction in system designs where high intelligibility is required.
- When compared to our 6ND410 state-of-the-art midrange transducer, 6NMB420 offers a lower frequency resonance and a longer linear Xmax value. As a result the speaker shows an increased output around 250Hz, with a consequent slightly reduced output above 700Hz.
- It is suitable as mid-bass in line array systems or multiple way systems with high-pass crossover above 200 Hz and low-pass up to 3kHz; enclosure might be closed or vented with volume size starting from 2 lit.
- The speaker offers a superb linearity: distortion values are furtherly minimized by new enhanced design criterias, developed by Eighteen Sound engineers, taking the 6NMB420 to very high level of performance.
- The extremely powerful external neodymium magnet assembly assures high flux concentration, low power compression and excellent heat exchange. The levels of force factor and power handling are, as a consequence, at the upper professional level with best power to weight ratio.
- A consistent heat transfer is guaranteed by the encapsulation of the magnetic structure in the interior of the basket, offering a largecontact space between the back plate and the dissipating structure.
- Particular efforts were dedicated to the surround shape and material design in order to minimize the resonances on mid range frequencies. The triple roll design offers a consistent damping to typical bell modes.
- The 44 mm voice coil is made of light-weight aluminum wire and assures linearity and high power handling.
- The ability to perform in humid environments is a key feature of the 6NMB420: this is achieved through a proprietary humidity repellent cone treatment
Key Features
- 100 dB SPL 1W / 1m average sensitivity
- 44 mm (1 3/4 in) voice coil
- 200 W AES power handling
- External neodymium magnet assembly
- Single Demodulating Ring (SDR) for lower distortion
- Weather protected cone and plates for outdoor usage
- Improved heat dissipation via Active Cooling System
- Specially designed for line arrays and compact two way systems
General Specifications
| Nominal Diameter | 152mm (6 in) |
| Rated Impedance | 8 Ohm |
| AES Power | 200 W |
| Program Power | 260 W |
| Peak Power | 500 W |
| Sensitivity | 100 dB |
| Frequency Range | 200 - 7000 Hz |
| Power Compression @-10dB | 0,9 dB |
| Power Compression @-3dB | 1,6 dB |
| Power Compression @Full Power | 2,9 dB |
| Max Recomm. Frequency | 3500 Hz |
| Recomm. Enclosure Volume | 2 - 6 lt. (0,07 - 0,21 cuft) |
| Minimum Impedance | 6,2 Ohm at 25°C |
| Max Peak To Peak Excursion | 14 mm (0,55 in) |
| Voice Coil Diameter | 44 mm (1,75 in) |
| Voice Coil winding material | aluminum |
| Suspension | Triple Roll, Polycotton |
| Cone | Curvilinear, Paper |
Thiele Small Parameters
| Fs | 110 Hz |
| Re | 5,3 Ohm |
| Sd | 0,013 sq.mt. (20,15 sq.in.) |
| Qms | 2,7 |
| Qes | 0,38 |
| Qts | 0,33 |
| Vas | 6,1 lt. (0,22 cuft) |
| Mms | 8,5 gr. (18,76 lb) |
| BL | 9 Tm |
| Linear Mathematical Xmax | ± 3 mm (±0,12 in) |
| Le (1kHz) | 0,1 mH |
| Ref. Efficiency 1W@1m (half space) | 95,1 dB |
Mounting information
| Overall diameter | 162 mm (6,38 in) |
| N. of mounting holes and bolt | 4 |
| Mounting holes diameter | 5,5 mm (0,22 in) |
| Bolt circle diameter | 170 mm (6,69 in) |
| Front mount baffle cutout ø | 148 mm (5,38 in) |
| Rear mount baffle cutout ø | 148 mm (5,38 in) |
| Total depth | 73 mm (2,87 in) |
| Flange and gasket thickness | 11,5 mm (0,45 in) |
| Net weight | 1,25 kg (2,75 lb) |
| Shipping weight | 1,45 kg (3,19 lb) |
| Packaging Dimensions | 185x170x85mm (7.2x6.6x3.3 in) |
