Beyma · WR Series
Beyma 18WRS600
Beyma 18WRS600: inexpensive 18″ driver with ferrite motor, 3″ voice coil and Fs 30 Hz – with Qts 0.47 it depends on large enclosures.
Current · Last checked: 2026-09-28
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General data
Link to section “General data”- Type
- Woofer
- Nominal size
- 18″
- Nominal impedance
- 8 Ω Manufacturer
- Minimum impedance
- 6.5 Ω Manufacturer
- Sensitivity
- 97 dB 1 W / 1 m · nominal impedance (ZN) Manufacturer
- Frequency range
- 35 Hz – 1,000 Hz Manufacturer
- Voice coil Ø
- 76.2 mm Manufacturer
- Winding height
- not available
- Gap depth
- not available
- Flux density
- not available
- Magnet
- ferrite
- Weight
- 8.7 kg Manufacturer
- Baffle cut-out Ø
- 425 mm Manufacturer
- Overall diameter
- 457 mm Manufacturer
- Mounting depth
- 218 mm Manufacturer
- Displacement
- not available
- Recommended enclosure volume
- not available
Beyma does not state Mms for this model; the value is left empty here. The manufacturer does not give a recommended enclosure volume either.
Beyma also states a swept volume Vd of 1130 cm³. This does not match Sd × Xmax (1255 cm² × 8.5 mm ≈ 1067 cm³, a deviation of roughly 6 %), so we do not list Vd as a specified value here.
What can this driver do?
Link to section “What can this driver do?”Simulation from the datasheet values above. The suggestions are calculated, not stated by the manufacturer.
The EBP is between 50 and 100 – by the rule of thumb, both a bass reflex and a sealed enclosure are possible. This is based on an EBP of 62.5.
- Net volume
- 714 L
- Tuning frequency
- 24.5 Hz
- F3 (−3 dB)
- 22.1 Hz
- F6 (−6 dB)
- 20.2 Hz
- F10 (−10 dB)
- 18.3 Hz
- Sensitivity (2.83 V / 1 m)
- 96.9 dB
- Max. SPL at 22.1 Hz
- 114.1 dB
- Max. SPL at 44.2 Hz
- 118.1 dB
- Xmax limits below
- 74.2 Hz
- Ports
- 1 × 315 mm
- Port area for 17 m/s
- 670 cm²
- Max. port velocity
- 14.6 m/s
- Port length
- 31.3 cm
- at 600 W
- Maximum SPL (limited by Xmax)
- Power into 8 Ω (nominal impedance of the wiring).
- Flattest alignment: lowest F3 without the response rising more than 0.25 dB above the passband level or dropping more than 0.5 dB at 2 × F3.
- The 17 m/s limit (about 5 % of the speed of sound) is a common rule of thumb against port noise, not a standard. Rounded port ends allow higher values.
- Lumped-element Thiele/Small model, Half space, 1 m, chamber losses QL 7, Le as a plain inductance, no room influence. At high levels (heating, non-linear Bl and Cms) real results are lower.
Thiele-Small parameters
Link to section “Thiele-Small parameters”Small-signal parameters as stated by the manufacturer. They change with temperature and level.
Plausibility check
Link to section “Plausibility check”We recalculate dependent values from the datasheet. We flag deviations above 3 %.
| Check | Formula | Datasheet | Calculated | Result |
|---|---|---|---|---|
| Qts from Qes and Qms | Qts = Qes · Qms / (Qes + Qms) | 0.47 | 0.464 | consistent |
Power handling
Link to section “Power handling”- AES600 W
- Programme power1,200 W
Sources
Link to section “Sources”-
Tier A · primary source
Beyma 18WRS600 (8 Ω) – Product page with Thiele-Small parameters
Acústica Beyma S.L.U. · accessed on 28 September 2026
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Tier A · primary source
Beyma 18WRS600 – Datasheet (PDF)
Acústica Beyma S.L.U. · accessed on 13 November 2026
No revision given. Unlike the product page, contains the complete mounting dimensions.