Midbass Neodymium Transducer

Key Features

  • 93,5 dB SPL 1W-1m average sensitivity 
  • 700 W program power handling 
  • 75 mm (3 in) Interleaved sandwich voice coil 
  • External Neodymium magnet assembly 
  • Single Demodulating Ring (SDR) for lower distortion and maximum sound clarity 
  • Copper ring for reduced distortion and increased output 
  • Weather protected cone and coated plates 
  • Suitable for high performance line array and compact two way systems 
Datasheet Back


18 Sound’s 8NMB750 mid-bass neodymium transducer is a state-of-the-art 8-inch neodymium midbass driver that combines excellent linearity with high power handling capabilities (700 W), very low distortion and reduced power compression .

The external neodymium magnet assembly assures high flux concentration and excellent heat exchange.

The 75mm (3 in) inside outside aluminum voice coil employs Interleaved Sandwich Voice coil (ISV) technology.

A sophisticated distortion reduction system has been implemented using a demodulating ring for flux modulation cancellation related to voice coil excursion, together with a copper ring for the reduction of intermodulation distortion. Both systems are linearizing the inductance in relation to the excursion as well as the current variation.

The cone is treated against extremely aggressive environment conditions.

The compact size makes the 8NMB750 an ideal choice for high performance line arrays and compact two-way systems.

General Specifications

Nominal Diameter 210 mm (8 in)
Rated Impedance 16 Ω
AES Power 350 W
Program Power 700 W
Peak Power 1400 W
Sensitivity 93,5 dB
Frequency Range 56 ÷ 7000 Hz
Power Compression @-10dB 1.2 dB
Power Compression @-3dB 1.7 dB
Power Compression @Full Power 2.3 dB
Max Recomm. Frequency 3000 Hz
Recomm. Enclosure Volume 8 ÷ 16 lt. (0.28÷ 0.57 cu.ft)
Minimum Impedance 14 Ω at 25°
Max Peak To Peak Excursion 35 mm (1.38 in)
Voice Coil Diameter 75 mm (2.95 in)
Voice Coil winding material Aluminum
Suspension Triple roll, Polycotton
Cone Straight ribbed composite, Water, flame, UV repellent

Thiele Small Parameters

Fs 91 Hz
Re 10,2 Ω
Sd 0,023 sq.m (35.65 sq.in)
Qms 5,90
Qes 0,39
Qts 0,37
Vas 7,3 lt. (0.23 cu.ft)
Mms 30 gr. (0.07 lb)
BL 21,5 Tm
Linear Mathematical Xmax ±6,3 mm (±0.25 in)
Le (1kHz) 0,30 mH
Half space efficiency 1,4%

Mounting information

Overall diameter 225 mm (8.86 in)
N. of mounting holes and bolt 8
Mounting holes diameter 6.2 mm (0.24 in)
Bolt circle diameter 210 mm (8,27 in)
Front mount baffle cutout ø 186 mm (7.32 in)
Rear mount baffle cutout ø 184 mm (7.24 in)
Total depth 105 mm (4.13 in)
Flange and gasket thickness 11 mm (0,43 in)
Net weight 3.5 kg (7.72 lb)
Packaging Dimensions 235x235x150 mm (9.25x9.25x5.91 in)


Model Code Info
8NMB750 16 OHM 022086N700
8NMB750 8 OHM 022088N700

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