BEYMA 6NMFW
BEYMA 6NMFW — 6" / 6 inch · Midrange Driver · Midrange
200 W AES - 87 dB - 35 – 3000 Hz - 8 Ω
Part no.: 42A-CHS-MT-BEY-0030
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BEYMA 6NMFW — 6" · Midrange Driver
200 W AES · 87 dB Sensitivity · Frequency range 35 Hz – 3000 Hz
Technical data
- Diameter: 6 "
- Voice coil: 2 "
- Power handling: 200 W AES
- Sensitivity: 87 dB
- Impedance: 8 Ω
- Weight: 3.5 kg
- Frequency range: 35 – 3000 Hz
Series: NMFW · Part no.: 42A-CHS-MT-BEY-0030
Beyma 6NMFW: 6" mid-woofer with 9 mm Xmax, 35 Hz lower limit and 200 W AES
The Beyma 6NMFW is listed in the shop as a midrange driver, but its data shows a genuine mid-woofer: the frequency range starts at 35 Hz, Xmax is 9 mm and sensitivity is 87 dB. The 2" voice coil handles 200 W AES, and the weight is 3.5 kg. This is a driver for compact 2-way boxes and studio monitors, not for the PA midrange role.
The Thiele-Small parameters match: Fs 40 Hz, Qts 0.34, Vas 11 l and a BL of 14 Tm on 45 g Mms. The cone area of 154 cm² with 9 mm of excursion gives a Vd of 139 cm³, a displacement volume that means plenty of bass from a small box for a 6" driver. The EBP of 114 points towards bass-reflex, and that is exactly where the 6NMFW is best placed.
Use and enclosure
As a guide value, a bass-reflex cabinet of about 7.5 l tuned to 44 Hz gives an f3 of roughly 47 Hz, remarkable for a compact box. Sealed, about 3.3 l gives an fc of 83 Hz, a sensible option for a satellite speaker with a subwoofer. The 42.audio enclosure calculator helps with the exact tuning of volume and port.
The upper limit is 3,000 Hz, so the crossover to the tweeter sits below that and a dome, an AMT or a small compression driver on a waveguide with adequate power handling has to take over. The inductance of 0.95 mH causes an impedance rise that you should compensate in a passive crossover. At 87 dB you need considerably more amplifier power than with PA drivers, but the combination of extension and small enclosure is rare in this size.
What to look out for
- 87 dB sensitivity: expect considerably more amplifier power than with PA drivers.
- Xmax 9 mm, Vd 139 cm³: long-throw, a genuine mid-woofer.
- 8 Ω, Re 5.8 Ω, Le 0.95 mH: impedance compensation in the crossover is advisable.
- Frequency range only up to 3,000 Hz: the tweeter must cross correspondingly low.
- Bass-reflex guide value 7.5 l at 44 Hz, sealed 3.3 l.
Frequently asked questions
Is the 6NMFW really a midrange driver?
Judging by the data it is a mid-woofer: a 35 Hz lower limit, 9 mm Xmax and Fs 40 Hz argue for use as a bass-mid driver in a 2-way box. For a pure midrange section in PA systems 87 dB is too little efficiency.
Which amplifier suits the 6NMFW?
At 87 dB into 8 Ω you should plan an amplifier with real power for full levels, with the 200 W AES setting the frame. A subsonic filter below the tuning range protects the cone from over-excursion in a bass-reflex box.
Which enclosure fits?
Bass-reflex with about 7.5 l tuned to 44 Hz for an f3 around 47 Hz, or sealed with about 3.3 l for a satellite on a subwoofer. Both are guide values; the final design is done with the enclosure calculator.
At 42.audio you get the BEYMA 6NMFW 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 | 40 Hz |
| Total Q Qts | 0.34 |
| Electrical Q Qes | 0.35 |
| Mechanical Q Qms | 7.5 |
| Equivalent volume Vas | 11.0 l |
| Moving mass Mms | 45.0 g |
| Cone area Sd | 154 cm² |
| Linear excursion Xmax | 9 mm |
| Displaced volume Vd | 139 cm³ |
| Force factor BL | 14 Tm |
| DC resistance Re | 5.8 Ω |
| Voice coil inductance Le | 0.95 mH |
Specifications
| Allgemein | |
|---|---|
| Manufacturer | BEYMA |
| Category | Mid Frequency |
| Series | NMFW |
| Impedance (Ω) | 8 |
| Power handling (W) | 200 |
| Sensitivity (dB) | 87 |
| Frequency from (Hz) | 35 |
| Frequency to (Hz) | 3000 |
| Abmessungen & Korb | |
|---|---|
| Diameter | 6 |
| Voice coil (inch) | 2 |
| Weight (kg) | 3.5 |
| Thiele-Small-Parameter | |
|---|---|
| Re (Ω) | 5.8 |
| Le (mH) | 0.95 |
| Fs (Hz) | 40 |
| Qms | 7.5 |
| Qes | 0.35 |
| Qts | 0.34 |
| Vas (l) | 11 |
| Xmax (mm) | 9 |
| Vd (cm³) | 139 |
| BL (Tm) | 14 |
| Mms (kg) | 0.045 |
| Sd (m²) | 0.0154 |