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18SOUND 8MB400

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18SOUND (Eighteen Sound) 8MB400 — 8" / 8 inch · Woofer/Midrange (WM) · Bass · Ferrite
2" voice coil · 8 Ω
Part no.: 42A-CHS-TT-18S-0030

148.00 € 148.0 EUR 148.00 €

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  • Impedance (Ω)
  • Power handling (W)
  • Sensitivity (dB)
  • Frequency from (Hz)
  • Frequency to (Hz)
  • Diameter
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18SOUND 8MB400 — 8" · Woofer

280 W AES · 95 dB Sensitivity · Frequency range 55 Hz – 5200 Hz

Technical data

  • Diameter: 8 "
  • Voice coil: 2 "
  • Power handling: 280 W AES
  • Sensitivity: 95 dB
  • Impedance: 8 Ω
  • Magnet: Ferrite
  • Weight: 3.6 kg
  • Mounting depth: 99 mm
  • Frequency range: 55 – 5200 Hz

Datasheet (PDF) · Manufacturer page

Series: MB · Part no.: 42A-CHS-TT-18S-0030

18Sound 8MB400: 8" woofer/midrange with 2" voice coil, 95 dB and 280 W AES

If you are after an 8" woofer/midrange for compact PA boxes or stage monitors, 18Sound's MB series is where you end up. The 8MB400 pairs a ferrite magnet with a 2" voice coil and reaches 280 W AES at 95 dB sensitivity. Its 55 to 5200 Hz range makes it a genuine two-way driver: bass and mids from one cone, a compression driver above.

With 18 g of moving mass and a BL of 9.3 Tm the motor is tuned for midrange resolution rather than brute excursion; Xmax 5.8 mm and Vas 23.9 l at Fs 64 Hz and Qts 0.38 add up to a driver that works cleanly in small volumes. Mounting depth of 99 mm and 3.6 kg suit monitors, columns and compact cabinets.

Use and enclosure

An EBP of 149 points towards bass reflex. As a guide value the Thiele-Small parameters give a volume of about 22 l tuned to 64 Hz with an f3 near 64 Hz; sealed it would be roughly 9.7 l with a cut-off around 119 Hz, which only makes sense as a midrange chamber or with a subwoofer underneath. Check the actual design in the enclosure calculator at 42.audio.

In a 2-way box the 8MB400 covers everything up to the crossover to a compression driver; the 5200 Hz upper limit leaves room to hand over well below that. In a 3-way system with a separate bass driver it runs as a midrange in a sealed chamber around 9.7 l. Le of 0.96 mH rises towards the treble, which the crossover should account for.

What to look out for

  • 8 Ω nominal, Re 5 Ω: an amplifier with 280 W into 8 Ω is enough, more only adds limiter work.
  • 2" voice coil on ferrite: solid thermal handling at 3.6 kg.
  • Mounting depth 99 mm: fits shallow monitor wedges.
  • Xmax 5.8 mm: high-pass below 64 Hz in a reflex box.
  • Reflex guide value 22 l: compact enough for an 8" two-way box.

Frequently asked questions

What separates the 8MB400 from the 8NMB420?

The 8NMB420 uses neodymium, has a tighter motor at Qts 0.28 and a larger volume requirement with Vas 33 l. The 8MB400 relies on ferrite, is more forgiving in a small box at Qts 0.38 and weighs 3.6 kg.

Is the 8MB400 suitable for a stage monitor?

Yes, 95 dB sensitivity and 280 W AES fit a compact wedge. A reflex box around 22 l plus a 1" compression driver on a horn gives a common 8" monitor configuration.

Which version, 8MB400 or 8MB500?

The 8MB500 from the same series is tuned higher at Fs 73 Hz and needs less volume with Vas 18.4 l. The 8MB400 with Fs 64 Hz, Qts 0.38 and Vas 23.9 l is the more flexible reflex candidate when the box should also deliver some low-end.

18Sound 8MB400: manufacturer, spellings and classification

18Sound, 18 Sound and Eighteensound all refer to the same manufacturer: Eighteen Sound S.r.l. of Reggio Emilia, Italy. The 8MB400 is a 8-inch woofer with ferrite magnet from the MB series, available from 42.audio, 18Sound dealer in Germany, with datasheet and full specifications in the driver database.

At 42.audio you get the 18SOUND 8MB400 with datasheet PDF, all key data in the driver database and the enclosure calculator. More drivers from this manufacturer: Atlas 18Sound.

Thiele-Small parameters

Nominal impedance8 Ω
Resonance frequency fs64 Hz
Total Q Qts0.38
Electrical Q Qes0.43
Mechanical Q Qms3.23
Equivalent volume Vas23.9 l
Moving mass Mms18.0 g
Cone area Sd227 cm²
Linear excursion Xmax5.8 mm
Force factor BL9.3 Tm
DC resistance Re5 Ω
Voice coil inductance Le0.96 mH

Enclosure suggestion

The EBP of 149 suggests a bass-reflex enclosure. EBP = fs / Qes = 64 / 0.43

Sealed (Qtc 0.707)

Enclosure volume Vb
9.7 l
System resonance Fc
119 Hz
Cut-off frequency F3
119 Hz

Bass reflex (QB3 after Small)recommended

Enclosure volume Vb
19.6 l
Tuning frequency Fb
68 Hz
Cut-off frequency F3
70 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 Low Frequency
Series MB
Magnet Ferrite
Impedance (Ω) 8
Power handling (W) 280
Sensitivity (dB) 95
Frequency from (Hz) 55
Frequency to (Hz) 5200
Abmessungen & Korb
Diameter 8
Voice coil (inch) 2
Mounting depth (mm) 99
Weight (kg) 3.6
Thiele-Small-Parameter
Re (Ω) 5
Le (mH) 0.96
Fs (Hz) 64
Qms 3.23
Qes 0.43
Qts 0.38
Vas (l) 23.9
Xmax (mm) 5.8
BL (Tm) 9.3
Mms (kg) 0.018
Sd (m²) 0.0227