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BEYMA 21LEX1600Nd

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BEYMA 21LEX1600Nd — 21" / 21 inch · Woofer · Subwoofer / Bass · Neodymium Magnet
1600 W AES - 98 dB - 30 – 1000 Hz - 8 Ω
Part no.: 42A-CHS-TT-BEY-0001

682.00 € 682.0 EUR 682.00 €

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BEYMA 21LEX1600Nd — 21" · Woofer · Neodymium-Magnet

1600 W AES · 98 dB Sensitivity · Frequency range 30 Hz – 1000 Hz

Technical data

  • Diameter: 21 "
  • Voice coil: 4 "
  • Power handling: 1600 W AES
  • Sensitivity: 98 dB
  • Impedance: 8 Ω
  • Magnet: Neodymium
  • Weight: 11.8 kg
  • Mounting depth: 268 mm
  • Frequency range: 30 – 1000 Hz

Series: LEX · Part no.: 42A-CHS-TT-BEY-0001

Beyma 21LEX1600Nd: 21" neodymium subwoofer with 98 dB, 14 mm Xmax and 11.8 kg

If you want more cone area in a subwoofer without carrying the weight of a ferrite 21", the Beyma 21LEX1600Nd is the answer. The neodymium motor brings the driver in at 11.8 kg, with 1600 W AES power handling through a 4" voice coil and 98 dB sensitivity. Xmax of 14 mm combined with the large cone gives a displacement volume of 2428 cm³, substantially more than 18" drivers of the same power class manage.

The LEX series parameters are set up for vented loading: Fs 30 Hz, Qts 0.29, Vas 305 l and a motor with BL 36.6 Tm that keeps the 393 g moving mass under control. The EBP of 100 sits right at the boundary where sealed boxes are still possible but vented boxes are the better choice for extension. The mounting depth of 268 mm is normal for a 21" and needs to be considered in the cabinet design.

Use and enclosure

The vented guideline derived from the Thiele-Small parameters is around 131 l at fb 38 Hz with f3 near 44 Hz. For a 21" driver that is a fairly compact box which makes good use of the available excursion. Sealed, the guideline is about 62 l with fc around 73 Hz, more suited to kick-bass duty than to a subwoofer. Larger volumes with lower tuning are possible if you want more extension; the enclosure calculator at 42.audio shows the effect on excursion and cut-off frequency.

The transmission range of 30 Hz to 1000 Hz leaves plenty of headroom to the crossover point in subwoofer use. The inductance of 4.7 mH is high but plays no role in the bass region. An amplifier delivering about 1600 W into 8 Ω and a high-pass below the tuning frequency belong in the setup, so that the 14 mm Xmax is not consumed by signal content below fb.

What to look out for

  • Neodymium magnet: 11.8 kg instead of the mass of a comparable ferrite 21", good for mobile subs.
  • Mounting depth 268 mm: size cabinet depth and rear clearance accordingly.
  • Xmax 14 mm and Vd 2428 cm³: plenty of excursion reserve, still fit a subsonic filter.
  • Re 5.4 Ω, 8 Ω nominal: running two drivers in parallel gives 4 Ω.
  • Le 4.7 mH: high inductance, irrelevant in pure subwoofer duty.

Frequently asked questions

How does the 21LEX1600Nd differ from the Beyma 21QLEX1600Fe?

The parameters are close, Fs 30 Hz, Qts 0.29 versus 0.28, Vas 305 l versus 309 l. The main difference is the magnet: neodymium at 11.8 kg against ferrite at 17.1 kg. The 21LEX1600Nd brings 14 mm of Xmax and 2428 cm³ of displacement to the table.

How large does the vented cabinet need to be?

The guideline is about 131 l net with fb 38 Hz, which gives an f3 around 44 Hz. If you want to go deeper, increase the volume and lower the tuning, accepting somewhat less excursion control below fb.

Which amplifier suits 1600 W AES?

An amplifier delivering in the region of 1600 W into 8 Ω, with a limiter. Neodymium motors are more sensitive to heat than ferrite, so clean limiting is especially important here to keep the 4" coil from overheating.

Beyma 21LEX1600Nd: manufacturer, spellings and classification

Beyma and Acustica Beyma refer to the same manufacturer: Acústica Beyma S.L. of Moncada near Valencia, Spain. The 21LEX1600Nd is a 21-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 21LEX1600Nd with all key data in the driver database and the enclosure calculator. More drivers from this manufacturer: Atlas Beyma.

Thiele-Small parameters

Nominal impedance8 Ω
Resonance frequency fs30 Hz
Total Q Qts0.29
Electrical Q Qes0.3
Mechanical Q Qms8.6
Equivalent volume Vas305.0 l
Moving mass Mms393.0 g
Cone area Sd1,734 cm²
Linear excursion Xmax14 mm
Displaced volume Vd2,428 cm³
Force factor BL36.6 Tm
DC resistance Re5.4 Ω
Voice coil inductance Le4.7 mH

Enclosure suggestion

The EBP of 100 is in the intermediate range — either works; sealed plays tighter, bass reflex deeper and louder. EBP = fs / Qes = 30 / 0.3

Sealed (Qtc 0.707)

Enclosure volume Vb
61.7 l
System resonance Fc
73 Hz
Cut-off frequency F3
73 Hz

Bass reflex (QB3 after Small)

Enclosure volume Vb
102.6 l
Tuning frequency Fb
42 Hz
Cut-off frequency F3
48 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 BEYMA
Category Low Frequency
Series LEX
Magnet Neodymium
Impedance (Ω) 8
Power handling (W) 1600
Sensitivity (dB) 98
Frequency from (Hz) 30
Frequency to (Hz) 1000
Abmessungen & Korb
Diameter 21
Voice coil (inch) 4
Mounting depth (mm) 268
Weight (kg) 11.8
Thiele-Small-Parameter
Re (Ω) 5.4
Le (mH) 4.7
Fs (Hz) 30
Qms 8.6
Qes 0.3
Qts 0.29
Vas (l) 305
Xmax (mm) 14
Vd (cm³) 2428
BL (Tm) 36.6
Mms (kg) 0.393
Sd (m²) 0.1734