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Beyma

Beyma 18PW1400Fe/S

Beyma 18PW1400Fe/S: 18″ subwoofer driver with ferrite motor, 1400 W AES and Qts 0.27 – according to the manufacturer, for 180 L.

Current · Last checked: 2026-09-28

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Schematic cross-section: 18″ driver with ferrite motor Side section: on the left the motor with a large ferrite ring magnet, pole piece and top plate with the air gap. The voice coil sits in the gap on its former, held by the spider. To the right the cone opens out with its dust cap, with the surround at the edge of the basket. The drawing shows the construction, not the dimensions of a particular model.
Schematic cross-section of a driver with a ferrite motor. The drawing shows the construction, not the dimensions of this model; the manufacturer has a product photo.

General data

Link to section “General data”
Type
Subwoofer driver
Nominal size
18″
Nominal impedance
8 Ω Manufacturer
Minimum impedance
5.3 Ω Manufacturer
Sensitivity
98 dB 1 W / 1 m · nominal impedance (ZN) Manufacturer
Frequency range
25 Hz – 1,800 Hz Manufacturer
Voice coil Ø
101.6 mm Manufacturer
Winding height
not available
Gap depth
not available
Flux density
not available
Magnet
ferrite
Weight
16.9 kg Manufacturer
Baffle cut-out Ø
415 mm Manufacturer
Overall diameter
461 mm Manufacturer
Mounting depth
207 mm Manufacturer
Displacement
not available
Recommended enclosure volume
180 – 180 L Manufacturer

The minimum impedance of 5.3 Ω is well below the nominal impedance – be sure to take this into account when wiring several drivers in parallel.

What can this driver do?

Link to section “What can this driver do?”

Simulation from the datasheet values above. The suggestions are calculated, not stated by the manufacturer.

Bass reflex Calculated

The EBP is above 100 – by the rule of thumb, this points to a vented enclosure (bass reflex). This is based on an EBP of 114.3.

Net volume
117 L
Tuning frequency
46.5 Hz
F3 (−3 dB)
44.8 Hz
F6 (−6 dB)
40.4 Hz
F10 (−10 dB)
35.8 Hz
Sensitivity (2.83 V / 1 m)
98.3 dB
Max. SPL at 44.8 Hz
126.8 dB
Max. SPL at 89.7 Hz
129.6 dB
Xmax limits below
74.2 Hz
Ports
3 × 150 mm
Port area for 17 m/s
719 cm²
Max. port velocity
23.1 m/s
Port length
51.6 cm
1020501002005001k8090100110120130140Frequency (Hz)Level (dB SPL)
  • at 1,400 W
  • Maximum SPL (limited by Xmax)
  • Power into 8 Ω (nominal impedance of the wiring).
  • Flattest alignment: lowest F3 without the response rising more than 0.25 dB above the passband level or dropping more than 0.5 dB at 2 × F3.
  • The 17 m/s limit (about 5 % of the speed of sound) is a common rule of thumb against port noise, not a standard. Rounded port ends allow higher values.
  • Lumped-element Thiele/Small model, Half space, 1 m, chamber losses QL 7, Le as a plain inductance, no room influence. At high levels (heating, non-linear Bl and Cms) real results are lower.

Open in the designer

Thiele-Small parameters

Link to section “Thiele-Small parameters”

Small-signal parameters as stated by the manufacturer. They change with temperature and level.

Fs
32 Hz
Re
5.1 Ω
Le
1.2 mH (at 1,000 Hz)
Qts
0.27
Qes
0.28
Qms
10.2
Vas
228.9 L
BL
29 T·m
Mms
230 g
Cms
0.103 mm/N
Sd
1,255 cm²
Xmax
10 mm
Xdamage
55 mm
Vd
1.25 L
EBP
not available
Efficiency η₀
2.7 %

Plausibility check

Link to section “Plausibility check”

We recalculate dependent values from the datasheet. We flag deviations above 3 %.

Recalculated parameters
CheckFormula DatasheetCalculatedResult
Qts from Qes and Qms Qts = Qes · Qms / (Qes + Qms) 0.27 0.273 consistent
Vd from Sd and Xmax Vd = Sd · Xmax 1.251 1.255 consistent

Power handling

Link to section “Power handling”
  • AES1,400 W
  • Programme power2,800 W

Sources

Link to section “Sources”
  1. Tier A · primary source

    Beyma 18PW1400Fe/S (8 Ω) – Product page with Thiele-Small parameters

    Acústica Beyma S.L.U. · accessed on 28 September 2026

  2. Tier A · primary source

    Beyma 18PW1400Fe-S – Datasheet (PDF)

    Acústica Beyma S.L.U. · October 2020 · accessed on 13 November 2026

    Revision code “10/20” in the footer of the dimension drawing. Unlike the product page, contains the complete mounting dimensions.