Eighteen Sound 8NMB420

Eighteen Sound 8NMB420
General Specifications Datasheet
Brand Eighteen Sound
Reference 8NMB420
Manufacturer website www.eighteensound.com
Size 8 in
200 mm
Type Low Frequency
Impedance Z 8 Ω
Minimum impedance Zmin 5.9 Ω
Nominal Power P 280 W
Program Power Pmax 400 W
Sensitivity SPL 95 dB
Usable frequency range 60 - 5500 Hz
Recommended crossover 2500 Hz
Eighteen Sound 8NMB420 Frequency response
Eighteen Sound 8NMB420 Impedance
Thiele/Small parameters Values in gray are calculated.
Resonant frequency Fs 61 Hz
Surface area of cone Sd 220 cm²
DC resistance Re 5 Ω
Mechanical Q Qms 4.00
Electromagnetic Q Qes 0.31
Total Q factor Qts 0.28
Mechanical suspension compliance Cms 481 µm/N
Compliance equivalent air volume Vas 33 liters
Moving mass Mmd 13.02 g
Moving mass (including airload) Mms 14.9 g
Mechanical resistance Rms 1.43 N·s/m
BL product BL 10 T·m
Voice coil inductance Le 0.35 mH
Maximum linear excursion (one way) Xmax 5.75 mm
Maximum mechanical limit (one way) Xlim 9.5 mm
Efficiency η₀ 2.29 %
Efficiency bandwidth product EBP 196
Effective diaphragm diameter Ø 16.74 cm
Import this driver in a simulation software:
WinISD 18Sound 8NMB420.wdr
Hornresp 18Sound 8NMB420.txt
Basta! 18Sound 8NMB420.bastaelement
Eighteen Sound 8NMB420 Dimensions
Dimensions
Overall diameter 210.0 mm
Baffle hole diameter 184.0 mm
Overall depth 99 mm
Flange thickness 14.5 mm
Net weight 1.7 kg
Materials of construction
Diaphragm material Treated Paper
Diaphragm shape Curvilinear
Surround material Polycotton
Voice Coil Parameters
Voice coil diameter 51 mm
Coil material Aluminum
Similar drivers Power
(W)
SPL
(dB)
Fs
(Hz)
Sd
(cm²)
Qms
Qes
Vas
(L)
Xmax
(mm)
Eighteen Sound 8NMB420 280 95 61 220 4.00 0.31 33 5.8
Eighteen Sound 8MB400 280 95 64 227 3.23 0.43 24 5.8
Eighteen Sound 8CX401F 280 95 56 227 3.23 0.38 24 5.8
Eighteen Sound 8NW650 300 96 63 227 3.70 0.27 18 5.5
Fane SOVEREIGN PRO 8-225 225 97 62 220 4.30 0.42 22 5.5
Fane SOVEREIGN 8-225 225 97 62 213 4.30 0.42 22 5.5
Beyma 8WR250 250 95 62 220 2.40 0.26 18 6.0
B&C Speaker 8MBX51 8Ω 200 97 60 220 5.60 0.31 23 6.0
B&C Speaker 8CXN51 250 97 68 220 4.70 0.29 17 6.0
Beyma 8WRS250 250 95 68 220 2.80 0.30 13 6.0
SICA 8 S 2,5 CP 300 93 54 214 3.44 0.37 19 5.0

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