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BEYMA 12CXA400Nd

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BEYMA 12CXA400Nd — 12" / 12 inch · Coaxial Speaker · Coax / Coaxial Driver · Neodymium Magnet
400 W AES - 98 dB - 50 – 20000 Hz - 8 Ω
Part no.: 42A-CHS-KO-BEY-0004

583.00 € 583.0 EUR 583.00 €

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  • Impedance (Ω)
  • Power handling (W)
  • Sensitivity (dB)
  • Frequency from (Hz)
  • Frequency to (Hz)
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  • Voice coil (inch)
  • 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 12CXA400Nd — 12" · Coaxial Speaker · Neodymium-Magnet

400 W AES · 98 dB Sensitivity · Frequency range 50 Hz – 20000 Hz

Technical data

  • Diameter: 12 "
  • Voice coil: 2.85 "
  • Power handling: 400 W AES
  • Sensitivity: 98 dB
  • Impedance: 8 Ω
  • Magnet: Neodymium
  • Weight: 6.5 kg
  • Frequency range: 50 – 20000 Hz

Series: CXA · Part no.: 42A-CHS-KO-BEY-0004

Beyma 12CXA400Nd: 12" neodymium coax with 98 dB, 400 W and 6.5 kg for tops and monitors

Where the 12CXA400Fe relies on ferrite mass, the 12CXA400Nd brings the same motor strength with neodymium at 6.5 kg. The 12" coaxial driver from Beyma's CXA series delivers 98 dB sensitivity, 400 W AES power handling and a stated frequency range of 50 Hz to 20,000 Hz for the whole system. The 2.85" voice coil sits in a magnet system with BL 21.4 Tm, which together with 64 g of moving mass gives a Qts of 0.25.

This profile, high efficiency plus a tight motor, is typical of drivers meant to deliver a lot of level from small cabinets. Fs 45 Hz and Vas 88.5 l give the 12" enough substance for the fundamental range. With an Xmax of 6 mm the excursion headroom is solid but not aimed at deep bass; the character is that of a fast, loud top, not a subwoofer substitute. Compared with the 18Sound 12NCX750 at Qts 0.29 and Vas 63 l, the Beyma is suspended a little softer and needs slightly more volume.

Use and enclosure

Bass reflex is a given with an EBP of 173. The guideline is about 25 l net, tuned to 66 Hz, with f3 around 81 Hz. That is a very compact cabinet for a 12" coax, ideal for a light top over a subwoofer or a stage monitor that runs with sub support. Sealed would be 13 l with fc around 127 Hz. At Qts 0.25 it is worth checking the simulation in the enclosure calculator at 42.audio in both cases to set tuning and equalisation properly.

Take the crossover to the HF unit from Beyma's specifications for the CXA series. Because the range extends to 20,000 Hz, a 2-way system with sub and this coax as the top is the obvious topology. A high-pass below the tuning is mandatory at 6 mm Xmax. Neodymium also means paying attention to ventilation of the magnet system under sustained load, because neodymium loses strength as temperature rises; in the cabinet design that is quickly solved with air around the motor.

What to look out for

  • 6.5 kg neodymium: for flown tops and mobile monitors
  • 98 dB at 8 Ω, Re 6.6 Ω: enormous headroom with 400 W AES
  • Qts 0.25, Vas 88.5 l: about 25 l bass reflex as a guideline
  • Xmax 6 mm: set a high-pass, leave deep bass to the subwoofer
  • Le 1 mH: moderate, account for it with passive crossovers

Frequently asked questions

Can I run the 12CXA400Nd without a subwoofer?

For speech and light music in a cabinet around 25 l with f3 at 81 Hz, yes. It is not meant for full deep bass with Xmax 6 mm and the tight alignment; then a sub belongs below it.

What distinguishes it from the 12CXA400Fe?

Magnet material and weight: neodymium at 6.5 kg versus considerably heavier ferrite. The Nd has 98 dB, Fs 45 Hz and Vas 88.5 l; the Fe has Fs 42 Hz, Vas 94 l and slightly lower sensitivity. Power handling and Qts are identical.

Which amplifier should I choose?

A channel around 400 W AES into 8 Ω makes full use of the driver. Thanks to 98 dB sensitivity you reach high levels with smaller plate amps too; a limiter and the high-pass below the tuning frequency matter more.

At 42.audio you get the BEYMA 12CXA400Nd 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 fs45 Hz
Total Q Qts0.25
Electrical Q Qes0.26
Mechanical Q Qms7.1
Equivalent volume Vas88.5 l
Moving mass Mms64.0 g
Cone area Sd550 cm²
Linear excursion Xmax6 mm
Displaced volume Vd330 cm³
Force factor BL21.4 Tm
DC resistance Re6.6 Ω
Voice coil inductance Le1 mH

Enclosure suggestion

The EBP of 173 suggests a bass-reflex enclosure. EBP = fs / Qes = 45 / 0.26

Sealed (Qtc 0.707)

Enclosure volume Vb
12.6 l
System resonance Fc
127 Hz
Cut-off frequency F3
127 Hz

Bass reflex (QB3 after Small)recommended

Enclosure volume Vb
18.2 l
Tuning frequency Fb
73 Hz
Cut-off frequency F3
90 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 Coaxial
Series CXA
Magnet Neodymium
Impedance (Ω) 8
Power handling (W) 400
Sensitivity (dB) 98
Frequency from (Hz) 50
Frequency to (Hz) 20000
Abmessungen & Korb
Diameter 12
Voice coil (inch) 2.85
Weight (kg) 6.5
Thiele-Small-Parameter
Re (Ω) 6.6
Le (mH) 1
Fs (Hz) 45
Qms 7.1
Qes 0.26
Qts 0.25
Vas (l) 88.5
Xmax (mm) 6
Vd (cm³) 330
BL (Tm) 21.4
Mms (kg) 0.064
Sd (m²) 0.055