Eigtheen Sound 15NCX750 15" 1.4"Coaxial speaker 8ohm
The 15NCX750 is a 15" neodymium coaxial transducer designed for use in compact reflex enclosures and stage monitors as small as 40lt

97 dB LF / 109 dB HF SPL 1W/1m average sensitivity
Single magnet neodymium motor
800W LF - 240W HF maximum program power handling
Smooth on/off axis response
75 mm (3”) Interleaved Sandwich LF Voice coil (ISV)
Aluminum Demodulating Ring (SDR) for minimum LF distortion
60 mm (2.4”) HF pure Titanium diaphragm
Edge-wound Aluminum ribbon HF voice coil (EWAL)
HF copper sleeve for reduced distortion and higher output
Suitable for compact enclosures and stage monitors

LF General Specifications

Nominal Diameter 380 mm (15 in)
Rated Impedance 8 Ohm
AES Power 400 W
Program Power 800 W
Peak Power 1600 W
Sensitivity 97 dB
Frequency Range 50 - 4700 Hz
Power Compression @-10dB 0.9 dB
Power Compression @-3dB 2.8 dB
Power Compression @Full Power 4.2 dB
Max Recomm. Frequency 1400 Hz
Recomm. Enclosure Volume 80 - 140 lt. (2.83 - 4.95 cuft)
Minimum Impedance 6.3 Ohm at 25°C
Max Peak To Peak Excursion 27 mm (1.06 in)
Voice Coil Diameter 75 mm (2,95 in)
Voice Coil winding material copper
Suspension Triple roll, Polycotton
Cone Curvilinear, Water repellent, High damping pulp

Thiele Small Parameters

Fs 49 Hz
Re 5,4 Ohm
Sd 0,0881 sq.mt. (136.56 sq.in.)
Qms 6.32
Qes 0,40
Qts 0,37 Vas 141 lt. (4.98 cuft)
Mms 80.6 gr. (0.18 lb)
Vas 141 lt. (4.98 cuft)
BL 18.5 Tm
Linear Mathematical Xmax ± 5.5 mm (±0,22 in)
Le (1kHz) 0.66 mH
Ref. Efficiency 1W@1m (half space) 4.1 %

HF General Specifications

D.C. Resistance 6,1 Ohm
Continuous Power 120W above 1,1 kHz
Max. program power 240W above 1,1 kHz
Sensitivity 107 dB
Frequency Range 0.9 ÷ 18 kHz
Min Xover Frequency 1.1 kHz
Voice Coil Diameter 60 mm (2.4 in)

Mounting Details

Overall diameter 393 mm (15,47 in)
N. of mounting holes and bolt 8
Mounting holes diameter 7,15 mm (0,28 in)
Bolt circle diameter 371 mm (14,61 in)
Front mount baffle cutout ø 360 mm (14.17 in)
Rear mount baffle cutout ø 354 mm (13.94 in)
Total depth 185 mm (7.28 in)
Flange and gasket thickness 14 mm (0,55 in)
Net weight 5.3 kg (11.68 lb)
Shipping weight 6 kg (13,23 lb)
Packaging Dimensions 6 kg (13,23 lb)

The curvilinear profile LF cone provides smooth response within its intended frequency range thanks to its high damping pulp composition. The 75mm (3in) LF copper voice coil employs Interleaved Sandwich Voice coil (ISV) technology, in which a high strength former carries windings on both the outer and inner surfaces. This results in a balanced coil with a uniform distribution of mass and motive energy and an extremely linear motor assembly.

The low distortion and sound quality are further improved by an aluminum demodulating ring (SDR technology) that flatten LF impedance and phase with constant power transfer.
Equipped with a proprietary hybrid radial tangerine phase plug, the integrated HF compression driver has been designed to give a smooth, coherent wavefront at the horn entrance in all working frequency ranges with an high level of manufacturing consistency. The phase plug, with its short openings and high flare rate value, assures low distortion and remarkable improvements in mid-high frequency reproduction. A copper sleeve reduces inductance value above 10kHz, improving phase and impedance linearization.

The 2.4" diameter HF diaphragm assembly uses a high strength, high temperature treated Nomex voice coil former joined directly to the titanium diaphragm on its upper bend edge, assuring extended frequency energy transfer. This improves linearity and shows unparalleled reliability when compared with a straight former joint. A specific HF exit profile design has been chosen in order to maximize the cone’s profile coupling.

The high force neodymium single magnet structure makes the 15NCX750 a lightweight speaker for its performance class - only 5.1kg (11.25 lb).

The XO15NCX dedicated passive crossover filter is provided, making this neo coaxial speaker a ready-to-use transducer system.

Due to the widespread use of high power audio systems at outdoor events, the ability to perform in adverse weather conditions is an additional key feature of the 15NCX750H. This has been achieved using exclusive cone and magnet plate treatment processes which increase resistance against corrosion and make the cone water repellent.