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BEYMA 21QLEX1600Fe

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BEYMA 21QLEX1600Fe — 21" / 21 inch · Woofer · Subwoofer / Bass · Ferrite Magnet
1600 W AES - 98 dB - 30 – 1000 Hz - 8 Ω
Part no.: 42A-CHS-TT-BEY-0002

643.00 € 643.0 EUR 643.00 €

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  • Impedance (Ω)
  • Power handling (W)
  • Sensitivity (dB)
  • Frequency from (Hz)
  • Frequency to (Hz)
  • Diameter
  • Voice coil (inch)
  • Mounting depth (mm)
  • Weight (kg)
  • Re (Ω)
  • Le (mH)
  • Fs (Hz)
  • Qms
  • Qes
  • Qts
  • Vas (l)
  • Xmax (mm)
  • Vd (cm³)
  • BL (Tm)
  • Mms (kg)
  • Sd (m²)

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BEYMA 21QLEX1600Fe — 21" · Woofer · Ferrite-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: Ferrite
  • Weight: 17.1 kg
  • Mounting depth: 266 mm
  • Frequency range: 30 – 1000 Hz

Series: QLEX · Part no.: 42A-CHS-TT-BEY-0002

Beyma 21QLEX1600Fe: 21" ferrite subwoofer with 1600 W AES and 2254 cm³ displacement

The Beyma 21QLEX1600Fe is the ferrite variant among the 21" subwoofer drivers of the QLEX series: 4" voice coil, 1600 W AES, 98 dB sensitivity and a motor with BL 36.4 Tm driving a moving mass of 388 g. Ferrite here means 17.1 kg, but also a magnet system that keeps its strength at high coil temperatures, which matters in fixed installation or rental use where the driver runs for hours.

With Fs 30 Hz, Qts 0.28 and Vas 309 l the driver is clearly designed for vented loading, and the EBP of 100 confirms it. Xmax 13 mm and the 21" cone area yield 2254 cm³ of displacement. The low mechanical Q of 4.5 is notable: the suspension damps more strongly than on many other drivers in this class, which counteracts suspension resonances and makes behaviour at the end of travel more benign.

Use and enclosure

For a vented box the guideline is around 120 l net with fb 40 Hz and f3 near 46 Hz. That is compact for a 21" and results in a subwoofer that moves a lot of air from a moderate cabinet. Sealed, you end up at about 57 l with fc around 76 Hz, which makes no sense for subwoofer duty but could work in the kick-bass region. If you want to go below 46 Hz, a larger volume with lower tuning will do it; how far is something to check in the enclosure calculator at 42.audio.

The transmission range of 30 Hz to 1000 Hz leaves enough headroom above the usual subwoofer crossover. Le 4 mH does not interfere there. For the amplifier: around 1600 W into 8 Ω, plus a limiter and a high-pass below fb so the 13 mm Xmax is not eaten up by infrasonic content. The mounting depth of 266 mm sets the minimum cabinet depth.

What to look out for

  • 17.1 kg ferrite driver: heavy, but thermally robust in continuous use.
  • Mounting depth 266 mm: allow rear-panel clearance for the magnet in the cabinet design.
  • Xmax 13 mm, Vd 2254 cm³: a subsonic filter below fb prevents over-excursion.
  • Re 5.4 Ω at 8 Ω nominal: two drivers in parallel give 4 Ω.

Frequently asked questions

Ferrite or neodymium: 21QLEX1600Fe or 21LEX1600Nd?

Electrically and acoustically the two are close, Fs 30 Hz, Qts 0.28 versus 0.29, Vas 309 l versus 305 l. The 21QLEX1600Fe weighs considerably more at 17.1 kg than the neodymium version, but is less sensitive to heat. For fixed installations ferrite is usually the more sensible choice.

How does the 21QLEX1600Fe compare with the 18 Sound 21NLW5300?

The 21NLW5300 has a somewhat higher total Q with Fs 31 Hz, Qts 0.32 and Vas 325 l and wants a larger box. The 21QLEX1600Fe gets by with less volume at Qts 0.28 and Vas 309 l and has more motor strength relative to its moving mass.

Which enclosure makes the most of this driver?

Vented around 120 l with fb 40 Hz as the starting point. If you need more extension, enlarge the volume and tune lower. A sealed box with fc around 76 Hz is not a sensible option for a subwoofer.

Beyma 21QLEX1600Fe: manufacturer, spellings and classification

Beyma and Acustica Beyma refer to the same manufacturer: Acústica Beyma S.L. of Moncada near Valencia, Spain. The 21QLEX1600Fe is a 21-inch woofer with ferrite magnet from the QLEX 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 21QLEX1600Fe 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 Qts0.28
Electrical Q Qes0.3
Mechanical Q Qms4.5
Equivalent volume Vas309.0 l
Moving mass Mms388.0 g
Cone area Sd1,734 cm²
Linear excursion Xmax13 mm
Displaced volume Vd2,254 cm³
Force factor BL36.4 Tm
DC resistance Re5.4 Ω
Voice coil inductance Le4 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
57.5 l
System resonance Fc
76 Hz
Cut-off frequency F3
76 Hz

Bass reflex (QB3 after Small)

Enclosure volume Vb
92.6 l
Tuning frequency Fb
44 Hz
Cut-off frequency F3
51 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 QLEX
Magnet Ferrite
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) 266
Weight (kg) 17.1
Thiele-Small-Parameter
Re (Ω) 5.4
Le (mH) 4
Fs (Hz) 30
Qms 4.5
Qes 0.3
Qts 0.28
Vas (l) 309
Xmax (mm) 13
Vd (cm³) 2254
BL (Tm) 36.4
Mms (kg) 0.388
Sd (m²) 0.1734