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18SOUND 8CX401F

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18SOUND (Eighteen Sound) 8CX401F — 8" / 8 inch Coaxial Driver · Coax / Coaxial Driver · Ferrite
2"/1" voice coils · 8 Ω
Part no.: 42A-CHS-KO-18S-0001

263.00 € 263.0 EUR 263.00 €

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18SOUND 8CX401F — 8" · Coaxial Driver

280 W AES · 95 dB Sensitivity · Frequency range 65 Hz – 6100 Hz

Technical data

  • Diameter: 8 "
  • Voice coil: 2 "
  • Power handling: 280 W AES
  • Sensitivity: 95 dB
  • Impedance: 8 Ω
  • Magnet: Ferrite
  • Weight: 4.4 kg
  • Mounting depth: 150 mm
  • Frequency range: 65 – 6100 Hz
  • Cone material: Polyester
  • Coverage angle: 90 °
  • Rec. crossover: 3.0 kHz

Datasheet (PDF) · Manufacturer page

Series: CX · Part no.: 42A-CHS-KO-18S-0001

18Sound 8CX401F: 8" ferrite coax with 280 W, 95 dB and 3.0 kHz crossover for monitors

An 8" coax with a ferrite magnet, a 2" voice coil in the woofer and a 1" voice coil in the tweeter: the 8CX401F from 18Sound's CX series is the compact coaxial driver for applications where weight does not matter but space and point-source behaviour do. Key figures: 280 W AES, 95 dB sensitivity, 8 Ω, low-frequency section from 65 Hz to 6100 Hz. The tweeter uses a polyester diaphragm and radiates through a 90° cone.

The woofer parameters are well laid out for an 8": Fs 56 Hz, Qts 0.34, Vas 23.9 l, BL 9.3 Tm with only 18 g of moving mass. The Xmax of 5.8 mm is respectable for an 8" driver and allows useful low end in a reflex enclosure. At 4.4 kg the ferrite model is heavier than comparable neodymium coaxials, but the ferrite motor is insensitive to temperature and, in practice, undemanding when it comes to cooling.

Use and enclosure

Bass reflex is the right format with an EBP of 147. Guideline: about 16 l net, tuned to 62 Hz, f3 around 66 Hz. That gives a small near-field box or a compact stage monitor that reproduces speech and instruments fully and only needs a sub for bass-heavy material. Sealed it is 7.2 l with fc at 116 Hz, which suits installation speakers with a separate sub or surround channels in a home theatre. The enclosure calculator at 42.audio provides port dimensions for both. The 150 mm mounting depth is small enough for slim cabinets.

The recommended crossover to the tweeter is 3.0 kHz, considerably higher than in the large NCX models with their bigger HF coils. The 1" coil needs that distance from its resonance. The woofer runs up to 6100 Hz, so it can work cleanly up to the crossover and roll off beyond it with shallow filters. The 90° cone gives wide dispersion, ideal for monitors, small installations and desktop near-field monitors with active crossovers.

What to look out for

  • Ferrite magnet, 4.4 kg: heavier than neodymium, but insensitive to temperature
  • Mounting depth 150 mm: fits slim cabinets and shallow wedges
  • Crossover around 3.0 kHz: the 1" HF coil needs distance below
  • Re 5 Ω, 8 Ω nominal, 280 W AES: small amplifiers and plate amps are enough
  • Xmax 5.8 mm with Vas 23.9 l: useful low end in 16 l bass reflex

Frequently asked questions

Does the 8CX401F work as a near-field monitor?

Yes. In about 16 l bass reflex tuned to 62 Hz it reaches an f3 around 66 Hz; crossed actively at 3.0 kHz you get a coax monitor with point-source radiation in a 90° cone.

How does it compare to the B&C 8FCX51?

The 8FCX51 has a stiffer suspension with Fs 69 Hz, Qts 0.34 and Vas 16 l. The 8CX401F with Fs 56 Hz and Vas 23.9 l reaches slightly lower but needs marginally more volume. Both are listed in the driver database at 42.audio.

Which amplifier should I use?

A channel around 280 W AES into 8 Ω uses the full rating. With 95 dB sensitivity the driver also reaches decent levels with smaller plate amps; what matters is clean high-pass filtering below the tuning frequency.

18Sound 8CX401F: 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 8CX401F is a 8-inch coaxial driver with ferrite magnet from the CX 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 8CX401F 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 fs56 Hz
Total Q Qts0.34
Electrical Q Qes0.38
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 147 suggests a bass-reflex enclosure. EBP = fs / Qes = 56 / 0.38

Sealed (Qtc 0.707)

Enclosure volume Vb
7.2 l
System resonance Fc
116 Hz
Cut-off frequency F3
116 Hz

Bass reflex (QB3 after Small)recommended

Enclosure volume Vb
13.6 l
Tuning frequency Fb
67 Hz
Cut-off frequency F3
72 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 Coaxial
Series CX
Magnet Ferrite
Impedance (Ω) 8
Power handling (W) 280
Sensitivity (dB) 95
Frequency from (Hz) 65
Frequency to (Hz) 6100
Abmessungen & Korb
Diameter 8
Voice coil (inch) 2
Mounting depth (mm) 150
Weight (kg) 4.4
Thiele-Small-Parameter
Re (Ω) 5
Le (mH) 0.96
Fs (Hz) 56
Qms 3.23
Qes 0.38
Qts 0.34
Vas (l) 23.9
Xmax (mm) 5.8
BL (Tm) 9.3
Mms (kg) 0.018
Sd (m²) 0.0227