BEYMA 18LEX1000Nd
BEYMA 18LEX1000Nd — 18" / 18 inch · Woofer · Subwoofer / Bass · Neodymium Magnet
1000 W AES - 98 dB - 35 – 1000 Hz - 8 Ω
Part no.: 42A-CHS-TT-BEY-0005
Documents
BEYMA 18LEX1000Nd — 18" · Woofer · Neodymium-Magnet
1000 W AES · 98 dB Sensitivity · Frequency range 35 Hz – 1000 Hz
Technical data
- Diameter: 18 "
- Voice coil: 3.5 "
- Power handling: 1000 W AES
- Sensitivity: 98 dB
- Impedance: 8 Ω
- Magnet: Neodymium
- Weight: 7.6 kg
- Mounting depth: 233 mm
- Frequency range: 35 – 1000 Hz
Series: LEX · Part no.: 42A-CHS-TT-BEY-0005
Beyma 18LEX1000Nd: 7.6 kg lightweight 18" woofer with neodymium, 11 mm Xmax and 1000 W AES
Anyone building a portable 18" subwoofer looks at weight first. The Beyma 18LEX1000Nd with its neodymium motor weighs 7.6 kg and still delivers 1000 W AES power handling, 98 dB sensitivity and 11 mm Xmax. It comes from the LEX series and covers 35 to 1000 Hz at 8 Ω.
The Thiele-Small parameters show a classic vented-box driver: fs 34 Hz, Qts 0.39, Vas 260 l. The 3.5" voice coil with Re 5.1 Ω and Le 1.6 mH drives 185 g of moving mass with BL 22 Tm, displacement volume is 1,255 cm³. The Qms of 5.6 is rather low for a PA driver and indicates a suspension with noticeable mechanical damping, which takes some edge off resonance peaks in the box.
Use and enclosure
EBP 81 means both vented and sealed are possible. The vented guideline is 261 l with tuning and f3 at 33 Hz. That is a lot of volume, but it makes full use of the driver's extension – the right alignment for subwoofer duty in music and cinema. Sealed, 114 l with fc at 62 Hz is the Butterworth starting point, a good compromise for installations with limited space and active equalisation.
The mounting depth of 233 mm is the biggest hurdle in shallow cabinets. As a subwoofer, cross it far below the upper limit of 1000 Hz; a high-pass below the tuning frequency remains mandatory at 1000 W. Port length and port area for your volume come from the enclosure calculator at 42.audio.
What to look out for
- 8 Ω, Re 5.1 Ω: uncritical for PA amplifiers rated for 8 Ω.
- Only 7.6 kg: saves a lot of weight in dual-18" cabinets compared with ferrite drivers.
- Mounting depth 233 mm: set the cabinet depth around it.
- Xmax 11 mm, Vd 1,255 cm³: enough excursion for sub duty down to the tuning frequency.
- Neodymium: mind cooling under sustained load, magnetic flux depends on temperature.
Frequently asked questions
What is the difference from the 18LEX1000Fe?
The design is the same: fs 34 Hz, Qts 0.39 versus 0.38, Vas 260 l versus 250 l, same 1000 W AES. The Nd weighs 7.6 kg, the ferrite model considerably more. If the box gets moved around, neodymium pays off; for fixed subwoofer installations the ferrite model is the pragmatic alternative.
Does the 18LEX1000Nd fit into a compact enclosure?
Sealed, 114 l with fc at 62 Hz is the guideline, which is compact for an 18". Bass below resonance then has to be boosted by DSP, which costs excursion and power. For full extension without equalisation, the 261 l vented guideline remains the better basis.
Which power amplifier suits the 18LEX1000Nd?
At 1000 W AES into 8 Ω, an amplifier with that output gets the most out of the driver; with 98 dB sensitivity you reach high levels with less power too. More important than headroom is a high-pass that protects the 11 mm Xmax at low frequencies.
Beyma 18LEX1000Nd: manufacturer, spellings and classification
Beyma and Acustica Beyma refer to the same manufacturer: Acústica Beyma S.L. of Moncada near Valencia, Spain. The 18LEX1000Nd is a 18-inch woofer with neodymium magnet from the LEX 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 18LEX1000Nd 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 | 34 Hz |
| Total Q Qts | 0.39 |
| Electrical Q Qes | 0.42 |
| Mechanical Q Qms | 5.6 |
| Equivalent volume Vas | 260.0 l |
| Moving mass Mms | 185.0 g |
| Cone area Sd | 1,255 cm² |
| Linear excursion Xmax | 11 mm |
| Displaced volume Vd | 1,255 cm³ |
| Force factor BL | 22 Tm |
| DC resistance Re | 5.1 Ω |
| Voice coil inductance Le | 1.6 mH |
Enclosure suggestion
The EBP of 81 is in the intermediate range — either works; sealed plays tighter, bass reflex deeper and louder. EBP = fs / Qes = 34 / 0.42
Sealed (Qtc 0.707)
- Enclosure volume Vb
- 113.7 l
- System resonance Fc
- 62 Hz
- Cut-off frequency F3
- 62 Hz
Bass reflex (QB3 after Small)
- Enclosure volume Vb
- 232.6 l
- Tuning frequency Fb
- 35 Hz
- Cut-off frequency F3
- 36 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 %.
- Beyma 18LEX1600Fefs 34 Hz · Qts 0.38 · Vas 188 l · in the shop
- Beyma 18LEX1000Fefs 34 Hz · Qts 0.38 · Vas 250 l · in the shop
- FaitalPRO 18FX800fs 34 Hz · Qts 0.4 · Vas 247 l · in the database
- FaitalPRO 18HP1010fs 35 Hz · Qts 0.4 · Vas 240.1 l · in the database
- Beyma 18LEX1200Fefs 32 Hz · Qts 0.38 · Vas 277 l · in the shop
- FaitalPRO 18HW1070fs 32 Hz · Qts 0.38 · Vas 195.9 l · in the database
Specifications
| Allgemein | |
|---|---|
| Manufacturer | BEYMA |
| Category | Low Frequency |
| Series | LEX |
| Magnet | Neodymium |
| Impedance (Ω) | 8 |
| Power handling (W) | 1000 |
| Sensitivity (dB) | 98 |
| Frequency from (Hz) | 35 |
| Frequency to (Hz) | 1000 |
| Abmessungen & Korb | |
|---|---|
| Diameter | 18 |
| Voice coil (inch) | 3.5 |
| Mounting depth (mm) | 233 |
| Weight (kg) | 7.6 |
| Thiele-Small-Parameter | |
|---|---|
| Re (Ω) | 5.1 |
| Le (mH) | 1.6 |
| Fs (Hz) | 34 |
| Qms | 5.6 |
| Qes | 0.42 |
| Qts | 0.39 |
| Vas (l) | 260 |
| Xmax (mm) | 11 |
| Vd (cm³) | 1255 |
| BL (Tm) | 22 |
| Mms (kg) | 0.185 |
| Sd (m²) | 0.1255 |