BEYMA 8BR40/N
BEYMA 8BR40/N — 8" / 8 inch · Full-Range Driver · Full-Range / Wideband
50 W AES - 91 dB - 30 – 6000 Hz - 8 Ω
Part no.: 42A-CHS-BB-BEY-0003
Documents
BEYMA 8BR40/N — 8" · Full-Range Driver
50 W AES · 91 dB Sensitivity · Frequency range 30 Hz – 6000 Hz
Technical data
- Diameter: 8 "
- Voice coil: 1 "
- Power handling: 50 W AES
- Sensitivity: 91 dB
- Impedance: 8 Ω
- Weight: 1.35 kg
- Frequency range: 30 – 6000 Hz
Series: BR · Part no.: 42A-CHS-BB-BEY-0003
Beyma 8BR40/N: 8" wideband driver with 91 dB, Fs 30 Hz and 90 l bass reflex guideline
The Beyma 8BR40/N is an 8" driver whose 30 Hz resonance frequency is more reminiscent of a woofer than of a wideband driver. Beyma lists it in the BR series with a transmission range from 30 Hz to 6,000 Hz, 91 dB sensitivity, 50 W AES and 8 Ω. At 1.35 kg it is light, and the 1" voice coil fits a driver designed for bandwidth rather than maximum power.
The parameter set is that of a classic reflex driver: Qts 0.39 with Qes 0.48, Vas 89.1 l and an Xmax of 6.7 mm which, with 220 cm² of cone area, gives a displacement volume of 147 cm³. The 21 g moving mass is low for an 8", which explains the midrange reach up to 6,000 Hz. Le 0.5 mH against Re 5.5 Ω is moderate. The EBP of 62 allows bass reflex and sealed; the combination of low resonance and low Qts argues for reflex.
Use and enclosure
As a guideline for bass reflex you get about 90 l tuned to 29 Hz with a lower cut-off of 29 Hz. That is a large volume for an 8" loudspeaker, but it is the way to actually reach the 30 Hz. Sealed with a Butterworth alignment the guideline is around 39 l and a 54 Hz corner frequency, which in many living rooms is the more practical option and controls the driver's excursion below the tuning better. Both are approximations; the fine tuning is done in the enclosure calculator at 42.audio.
Above 6,000 Hz the 8BR40/N needs a tweeter. Place the crossover below that limit so the cone does not run into its beaming region; at 91 dB it works with many tweeters without heavy padding. In a 2-way design of 8BR40/N plus tweeter you get a speaker that manages without a subwoofer, which is not a given for an 8" driver.
What to look out for
- Fs 30 Hz, Qts 0.39: classic reflex design, guideline 90 l tuned to 29 Hz.
- Sealed around 39 l at 54 Hz: more compact alternative with controlled excursion.
- 50 W AES at 8 Ω: amplifier power with restraint, a high-pass below the tuning is sensible.
- Xmax 6.7 mm and Vd 147 cm³: enough excursion for bass without a subwoofer in small rooms.
- Weight 1.35 kg: light driver, easy to mount.
Frequently asked questions
Bass reflex or sealed for the 8BR40/N?
Bass reflex with around 90 l tuned to 29 Hz extracts the deepest bass; sealed with about 39 l and a 54 Hz corner frequency is more compact and controls excursion better. If you have the space and want to listen without a subwoofer, go reflex; if you want a smaller box, go sealed.
Which tweeter fits the 8BR40/N?
One that starts cleanly below 6,000 Hz and keeps up with 91 dB in level. Domes are the simple route; a small compression driver with horn from the Beyma range is the alternative for higher levels.
Is 50 W AES enough power handling?
For living rooms and small-scale sound reinforcement yes, because 91 dB sensitivity means little power is needed for decent level. With a reflex alignment, a high-pass below 29 Hz protects the cone from over-excursion, since the enclosure loses control of the cone there.
Beyma 8BR40/N: manufacturer, spellings and classification
Beyma and Acustica Beyma refer to the same manufacturer: Acústica Beyma S.L. of Moncada near Valencia, Spain. The 8BR40/N is a 8-inch full-range driver from the BR 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 8BR40/N 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 | 30 Hz |
| Total Q Qts | 0.39 |
| Electrical Q Qes | 0.48 |
| Mechanical Q Qms | 2.1 |
| Equivalent volume Vas | 89.1 l |
| Moving mass Mms | 21.0 g |
| Cone area Sd | 220 cm² |
| Linear excursion Xmax | 6.7 mm |
| Displaced volume Vd | 147 cm³ |
| Force factor BL | 6.8 Tm |
| DC resistance Re | 5.5 Ω |
| Voice coil inductance Le | 0.5 mH |
Enclosure suggestion
The EBP of 62 is in the intermediate range — either works; sealed plays tighter, bass reflex deeper and louder. EBP = fs / Qes = 30 / 0.48
Sealed (Qtc 0.707)
- Enclosure volume Vb
- 39.0 l
- System resonance Fc
- 54 Hz
- Cut-off frequency F3
- 54 Hz
Bass reflex (QB3 after Small)
- Enclosure volume Vb
- 79.7 l
- Tuning frequency Fb
- 31 Hz
- Cut-off frequency F3
- 32 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.
Specifications
| Allgemein | |
|---|---|
| Manufacturer | BEYMA |
| Category | Full Range |
| Series | BR |
| Impedance (Ω) | 8 |
| Power handling (W) | 50 |
| Sensitivity (dB) | 91 |
| Frequency from (Hz) | 30 |
| Frequency to (Hz) | 6000 |
| Abmessungen & Korb | |
|---|---|
| Diameter | 8 |
| Voice coil (inch) | 1 |
| Weight (kg) | 1.35 |
| Thiele-Small-Parameter | |
|---|---|
| Re (Ω) | 5.5 |
| Le (mH) | 0.5 |
| Fs (Hz) | 30 |
| Qms | 2.1 |
| Qes | 0.48 |
| Qts | 0.39 |
| Vas (l) | 89.1 |
| Xmax (mm) | 6.7 |
| Vd (cm³) | 147 |
| BL (Tm) | 6.8 |
| Mms (kg) | 0.021 |
| Sd (m²) | 0.022 |