BEYMA 15XA38Nd8
BEYMA 15XA38Nd8 — 15" / 15 inch · Coaxial Speaker · Coax / Coaxial Driver · Neodymium Magnet
350 W AES - 99 dB - 40 – 20000 Hz - 8 Ω LF / 16 Ω HF
Part no.: 42A-CHS-KO-BEY-0002
BEYMA 15XA38Nd8 — 15" · Koaxiallautsprecher · Neodym-Magnet · 8 Ω / 16 Ω
350 W AES · 99 dB Sensitivity · Frequency range 40 Hz – 20000 Hz
Technical data
- Diameter: 15 "
- Power handling: 350 W AES
- Sensitivity: 99 dB
- Impedanz: 8 Ω (Tieftöner) / 16 Ω (Hochtöner)
- Magnet: Neodymium
- Weight: 6.8 kg
- Frequency range: 40 – 20000 Hz
Series: XA · Part no.: 42A-CHS-KO-BEY-0002
Beyma 15XA38Nd: 15" coaxial with 99 dB and a strong neodymium motor for PA tops
Sensitivity 99 dB, BL 20.4 Tm, Qts 0.3: the figures of the Beyma 15XA38Nd describe a 15" coaxial driver built for efficiency and control. The neodymium motor keeps the weight at 6.8 kg, the HF unit at the centre of the cone extends the response to 20,000 Hz, and 350 W AES at 8 Ω leaves plenty of reserve for loud two-way systems.
As a member of the XA series, the 15XA38Nd differs from the CXA coaxials mainly in its stronger motor. A Qts of 0.3 at Fs 38 Hz and Vas 238 l means the driver is heavily damped electrically; the cone with 82 g of moving mass follows the signal precisely but demands a properly tuned enclosure so it does not sound thin in the bass. For midrange and dynamics this very alignment is an advantage.
Use and enclosure
With an EBP of 123 the 15XA38Nd clearly belongs in a vented box or a horn. As a guideline, the parameters give a bass reflex volume of about 113 l tuned to 47 Hz with a lower cutoff around 53 Hz. That is compact for a 15" system and suits PA tops that are complemented by a subwoofer. Sealed, around 52 l with a corner frequency of 90 Hz would yield a pure mid-high top that leaves the bass entirely to the sub. The enclosure calculator on 42.audio handles the exact design.
Typical applications are two-way PA tops with high output, stage monitors that must cut through loud stages, and installations where a single cutout per cabinet is preferred. The crossover between cone and HF unit is your own design; the parameters for it are in the driver database.
What to look out for
- 99 dB sensitivity at 8 Ω: high SPL with moderate amplifier power, 350 W AES as the upper limit.
- Qts 0.3 and EBP 123: bass reflex or horn, sealed only as a mid-high top.
- 6.8 kg thanks to neodymium: light enough for touring cabinets.
- Xmax 6 mm, Vd 528 cm³: enough excursion for a top, not for subwoofer duty.
- Re 6.7 Ω, Le 1 mH: include the inductance in your crossover calculation.
Frequently asked questions
How does the 15XA38Nd differ from the 18 Sound 15NCX1000?
The 15NCX1000 has a much smaller equivalent volume with Fs 53 Hz and Vas 75 l and is meant for very compact boxes. The 15XA38Nd reaches lower with Fs 38 Hz and needs more volume in return; both share a similarly low Qts around 0.3.
Is the driver enough without a subwoofer?
In the guideline vented box the lower cutoff is around 53 Hz. That is sufficient for speech and many music applications; for bass-heavy material you should plan a subwoofer and run the 15XA38Nd as a top, where its 99 dB really pay off.
Which amplifier makes sense?
A power amp delivering in the range of the 350 W AES into 8 Ω exploits the power handling. Because of the high sensitivity a clean limiter matters more than headroom; an amplifier with less power that never clips is kinder to the driver.
Beyma 15XA38Nd: manufacturer, spellings and classification
Beyma and Acustica Beyma refer to the same manufacturer: Acústica Beyma S.L. of Moncada near Valencia, Spain. The 15XA38Nd is a 15-inch coaxial driver with neodymium magnet from the XA 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 15XA38Nd 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 (Tieftöner) / 16 Ω (Hochtöner) |
|---|---|
| Resonance frequency fs | 38 Hz |
| Total Q Qts | 0.3 |
| Electrical Q Qes | 0.31 |
| Mechanical Q Qms | 6.4 |
| Equivalent volume Vas | 238.0 l |
| Moving mass Mms | 82.0 g |
| Cone area Sd | 880 cm² |
| Linear excursion Xmax | 6 mm |
| Displaced volume Vd | 528 cm³ |
| Force factor BL | 20.4 Tm |
| DC resistance Re | 6.7 Ω |
| Voice coil inductance Le | 1 mH |
Enclosure suggestion
The EBP of 123 suggests a bass-reflex enclosure. EBP = fs / Qes = 38 / 0.31
Sealed (Qtc 0.707)
- Enclosure volume Vb
- 52.3 l
- System resonance Fc
- 90 Hz
- Cut-off frequency F3
- 90 Hz
Bass reflex (QB3 after Small)recommended
- Enclosure volume Vb
- 89.6 l
- Tuning frequency Fb
- 51 Hz
- Cut-off frequency F3
- 58 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 %.
- B&C Speakers 15CXN76fs 38 Hz · Qts 0.28 · Vas 246 l · in the database
- B&C Speakers 15HCX76fs 38 Hz · Qts 0.28 · Vas 246 l · in the database
- B&C Speakers 15CXN88fs 47 Hz · Qts 0.3 · Vas 124 l · in the database
- FaitalPRO 15HX500fs 40 Hz · Qts 0.28 · Vas 150.1 l · in the database
- B&C Speakers 15HTX100fs 52 Hz · Qts 0.29 · Vas 78 l · in the database
- 18 Sound 15NCX1000fs 53 Hz · Qts 0.31 · Vas 75 l · in the shop
Specifications
| Allgemein | |
|---|---|
| Manufacturer | BEYMA |
| Category | Coaxial |
| Series | XA |
| Magnet | Neodymium |
| Impedance (Ω) | 8 |
| Power handling (W) | 350 |
| Sensitivity (dB) | 99 |
| Frequency from (Hz) | 40 |
| Frequency to (Hz) | 20000 |
| Abmessungen & Korb | |
|---|---|
| Diameter | 15 |
| Weight (kg) | 6.8 |
| Thiele-Small-Parameter | |
|---|---|
| Re (Ω) | 6.7 |
| Le (mH) | 1 |
| Fs (Hz) | 38 |
| Qms | 6.4 |
| Qes | 0.31 |
| Qts | 0.3 |
| Vas (l) | 238 |
| Xmax (mm) | 6 |
| Vd (cm³) | 528 |
| BL (Tm) | 20.4 |
| Mms (kg) | 0.082 |
| Sd (m²) | 0.088 |