BEYMA 18PW1400Fe/S
BEYMA 18PW1400Fe/S — 18" / 18 inch · Woofer · Subwoofer / Bass · Ferrite Magnet
1400 W AES - 98 dB - 25 – 1800 Hz - 8 Ω
Part no.: 42A-CHS-TT-BEY-0008
Documents
BEYMA 18PW1400Fe/S — 18" · Woofer · Ferrite-Magnet
1400 W AES · 98 dB Sensitivity · Frequency range 25 Hz – 1800 Hz
Technical data
- Diameter: 18 "
- Voice coil: 4 "
- Power handling: 1400 W AES
- Sensitivity: 98 dB
- Impedance: 8 Ω
- Magnet: Ferrite
- Weight: 16.9 kg
- Mounting depth: 206.5 mm
- Frequency range: 25 – 1800 Hz
Series: PW · Part no.: 42A-CHS-TT-BEY-0008
Beyma 18PW1400Fe/S: 18" woofer with BL 29 Tm, Qts 0.27 and 1400 W AES for horn and vented use
BL 29 Tm and Qts 0.27 – the Beyma 18PW1400Fe/S has a very strong motor. The 18" woofer from the PW series works with a ferrite magnet and 4" voice coil, handles 1400 W AES and delivers 98 dB at 8 Ω. The range is given as 25 to 1800 Hz, weight is 16.9 kg.
Qes 0.28 with 230 g of moving mass, fs 32 Hz and Vas 228.9 l describe a driver whose motor dominates the cone. The inductance of 1.2 mH is low for a 4" coil and explains the bandwidth up to 1800 Hz. Xmax 10 mm and Vd 1,251 cm³ provide decent excursion. Drivers with such a low Qts are the classic candidates for horn loading and small, high-tuned vented boxes.
Use and enclosure
EBP 114 points clearly towards vented or horn loading. The vented guideline is unusually compact for an 18": 80 l tuned to 44 Hz with an f3 around 52 Hz. Sealed, 39 l with fc at 84 Hz results, which leaves hardly any deep bass without equalisation and only suits bass tops with a subwoofer below. The 25 Hz lower limit is only reached in a horn design or with lower tuning in a larger volume plus equalisation – how shallow the curve becomes is shown by the enclosure calculator at 42.audio.
The mounting depth of 206.5 mm is comparatively shallow for an 18", the weight of 16.9 kg on the high side. For comparison: the 18 Sound 18LW1251 also has Qts 0.27 but fs 35 Hz and Vas 268 l; the 18 Sound 18NLW9400 sits at Qts 0.26 and Vas 268 l. The Beyma with Vas 228.9 l and fs 32 Hz ends up in the slightly smaller box. A high-pass below tuning is mandatory at 1400 W so the 10 mm Xmax is respected.
What to look out for
- 8 Ω, Re 5.1 Ω: a standard load, choose an amplifier with a clean limiter for 1400 W AES.
- 16.9 kg: heavy ferrite motor, build cabinet and handles accordingly.
- Mounting depth 206.5 mm: comparatively shallow for an 18".
- Qts 0.27, EBP 114: vented guideline 80 l or horn loading, not sealed.
- Xmax 10 mm: set a high-pass below the tuning frequency.
Frequently asked questions
Is the 18PW1400Fe/S a horn driver?
The parameters say so: Qts 0.27, BL 29 Tm and EBP 114 are the combination horn loading needs to control the cone under high acoustic load. It works just as well in a compact vented box around 80 l. For large, low-tuned cabinets there are more suitable drivers.
18PW1400Fe/S or 18 Sound 18LW1251?
Both have Qts 0.27. The 18LW1251 has fs 35 Hz and Vas 268 l, the Beyma fs 32 Hz and Vas 228.9 l – it needs slightly less volume and has the lower resonance. Add 1400 W AES and BL 29 Tm. 42.audio carries both in the shop.
Why is the vented guideline only 80 l?
Because the low Qts of 0.27 yields a small volume with high tuning according to the approximation formulas; the f3 then sits around 52 Hz. A larger box with lower tuning is possible, the curve then rolls off more gently. The right balance is found in the enclosure calculator.
Beyma 18PW1400Fe/S: manufacturer, spellings and classification
Beyma and Acustica Beyma refer to the same manufacturer: Acústica Beyma S.L. of Moncada near Valencia, Spain. The 18PW1400Fe/S is a 18-inch woofer with ferrite magnet from the PW series, available from 42.audio, Beyma dealer in Germany, with datasheet and full specifications in the driver database.
At 42.audio you get the BEYMA 18PW1400Fe/S with all key data in the driver database and the enclosure calculator. More drivers from this manufacturer: Atlas Beyma.
Thiele-Small parameters
| Nominal impedance | 8 Ω |
|---|---|
| Resonance frequency fs | 32 Hz |
| Total Q Qts | 0.27 |
| Electrical Q Qes | 0.28 |
| Mechanical Q Qms | 10.2 |
| Equivalent volume Vas | 228.9 l |
| Moving mass Mms | 230.0 g |
| Cone area Sd | 1,255 cm² |
| Linear excursion Xmax | 10 mm |
| Displaced volume Vd | 1,251 cm³ |
| Force factor BL | 29 Tm |
| DC resistance Re | 5.1 Ω |
| Voice coil inductance Le | 1.2 mH |
Enclosure suggestion
The EBP of 114 suggests a bass-reflex enclosure. EBP = fs / Qes = 32 / 0.28
Sealed (Qtc 0.707)
- Enclosure volume Vb
- 39.1 l
- System resonance Fc
- 84 Hz
- Cut-off frequency F3
- 84 Hz
Bass reflex (QB3 after Small)recommended
- Enclosure volume Vb
- 60.8 l
- Tuning frequency Fb
- 48 Hz
- Cut-off frequency F3
- 57 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 %.
- 18 Sound 18LW1251fs 35 Hz · Qts 0.27 · Vas 268 l · in the shop
- FaitalPRO 18XL2000fs 28 Hz · Qts 0.27 · Vas 232.1 l · in the database
- Oberton 18XB1600fs 32.5 Hz · Qts 0.28 · Vas 267 l · in the database
- 18 Sound 18NLW9400fs 33 Hz · Qts 0.26 · Vas 268 l · in the shop
- FaitalPRO 18FH510fs 30 Hz · Qts 0.26 · Vas 391.4 l · in the database
- 18 Sound 18LW2600fs 30 Hz · Qts 0.28 · Vas 186 l · in the database
Specifications
| Allgemein | |
|---|---|
| Manufacturer | BEYMA |
| Category | Low Frequency |
| Series | PW |
| Magnet | Ferrite |
| Impedance (Ω) | 8 |
| Power handling (W) | 1400 |
| Sensitivity (dB) | 98 |
| Frequency from (Hz) | 25 |
| Frequency to (Hz) | 1800 |
| Abmessungen & Korb | |
|---|---|
| Diameter | 18 |
| Voice coil (inch) | 4 |
| Mounting depth (mm) | 206.5 |
| Weight (kg) | 16.9 |
| Thiele-Small-Parameter | |
|---|---|
| Re (Ω) | 5.1 |
| Le (mH) | 1.2 |
| Fs (Hz) | 32 |
| Qms | 10.2 |
| Qes | 0.28 |
| Qts | 0.27 |
| Vas (l) | 228.9 |
| Xmax (mm) | 10 |
| Vd (cm³) | 1251 |
| BL (Tm) | 29 |
| Mms (kg) | 0.23 |
| Sd (m²) | 0.1255 |