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18SOUND 8NMB420

18SOUND 8NMB420

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18SOUND (Eighteen Sound) 8NMB420 — 8" / 8 inch · Midrange with Lower Midrange (ML) · Midrange · Neodymium
2" voice coil · 4/8/16 Ω
Part no.: 42A-CHS-MT-18S-0023

183.00 € 183.0 EUR 183.00 €

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  • Manufacturer
  • Category
  • Series
  • Magnet
  • Impedance (Ω)
  • Power handling (W)
  • Sensitivity (dB)
  • Frequency from (Hz)
  • Frequency to (Hz)
  • Diameter
  • Voice coil (inch)
  • Mounting depth (mm)
  • Weight (kg)
  • Re (Ω)
  • Le (mH)
  • Fs (Hz)
  • Qms
  • Qes
  • Qts
  • Vas (l)
  • Xmax (mm)
  • BL (Tm)
  • Mms (kg)
  • Sd (m²)

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18SOUND 8NMB420 — 8" · Midrange Driver

280 W AES · 95 dB Sensitivity · Frequency range 60 Hz – 5500 Hz

Technical data

  • Diameter: 8 "
  • Voice coil: 2 "
  • Power handling: 280 W AES
  • Sensitivity: 95 dB
  • Impedance: 8 Ω
  • Magnet: Neo
  • Weight: 1.7 kg
  • Mounting depth: 99 mm
  • Frequency range: 60 – 5500 Hz

Datasheet (PDF) · Manufacturer page

Series: NMB · Part no.: 42A-CHS-MT-18S-0023

Thiele-Small parameters

Nominal impedance8 Ω
Resonance frequency fs61 Hz
Total Q Qts0.28
Electrical Q Qes0.31
Mechanical Q Qms4
Equivalent volume Vas33.0 l
Moving mass Mms14.9 g
Cone area Sd230 cm²
Linear excursion Xmax5.8 mm
Force factor BL10 Tm
DC resistance Re5 Ω
Voice coil inductance Le0.35 mH

Enclosure suggestion

The EBP of 197 suggests a bass-reflex enclosure. EBP = fs / Qes = 61 / 0.31

Sealed (Qtc 0.707)

Enclosure volume Vb
6.1 l
System resonance Fc
154 Hz
Cut-off frequency F3
154 Hz

Bass reflex (QB3 after Small)recommended

Enclosure volume Vb
9.9 l
Tuning frequency Fb
89 Hz
Cut-off frequency F3
104 Hz

Vb is the required net internal volume, Fb the tuning frequency of the reflex port and F3 the frequency at which the level has dropped by 3 dB. Calculated approximation after Small. A starting point for simulation, not a finished build plan.

Comparable drivers

Same size, same type, Qts within ±30 %.

Specifications

Allgemein
Manufacturer 18SOUND
Category Mid Frequency
Series NMB
Magnet Neo
Impedance (Ω) 8
Power handling (W) 280
Sensitivity (dB) 95
Frequency from (Hz) 60
Frequency to (Hz) 5500
Abmessungen & Korb
Diameter 8
Voice coil (inch) 2
Mounting depth (mm) 99
Weight (kg) 1.7
Thiele-Small-Parameter
Re (Ω) 5
Le (mH) 0.35
Fs (Hz) 61
Qms 4
Qes 0.31
Qts 0.28
Vas (l) 33
Xmax (mm) 5.8
BL (Tm) 10
Mms (kg) 0.0149
Sd (m²) 0.023