Fane · Professional Series
Fane Colossus Prime 18XS
Fane Colossus Prime 18XS: 18″ subwoofer driver with 4″ voice coil and 12 mm Xmax – Thiele-Small parameters, power handling and plausibility check.
Availability not checked · Last checked: 2026-09-13
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General data
Link to section “General data”- Type
- Subwoofer driver
- Nominal size
- 18″
- Nominal impedance
- 8 Ω Manufacturer
- Minimum impedance
- 6.5 Ω Manufacturer
- Sensitivity
- 100 dB 1 W / 1 m Manufacturer
- Frequency range
- 35 Hz – 500 Hz -6 dB Manufacturer
- Voice coil Ø
- 101.6 mm Manufacturer
- Winding height
- 30 mm Manufacturer
- Gap depth
- 11 mm Manufacturer
- Flux density
- 1.1 T Manufacturer
- Magnet
- ferrite (Y35)
- Weight
- 15.3 kg Manufacturer
- Baffle cut-out Ø
- 420 mm Front mounting. For rear mounting Fane states 414.78 mm. Manufacturer
- Overall diameter
- 485 mm Manufacturer
- Mounting depth
- 216 mm The dimensional drawing on the same page additionally shows 220 mm, without labelling what the dimension refers to. We adopt the table value. Manufacturer
- Displacement
- not available
- Recommended enclosure volume
- 125 – 400 L Manufacturer
According to a footnote, the frequency response in the datasheet was measured in half space in a sealed 975-litre enclosure. It is for comparison only and does not show the low-bass performance achievable in the finished enclosure.
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 81.7.
- Net volume
- 314 L
- Tuning frequency
- 33 Hz
- F3 (−3 dB)
- 30.7 Hz
- F6 (−6 dB)
- 27.8 Hz
- F10 (−10 dB)
- 24.7 Hz
- Sensitivity (2.83 V / 1 m)
- 97.5 dB
- Max. SPL at 30.7 Hz
- 124.5 dB
- Max. SPL at 61.4 Hz
- 126.2 dB
- Xmax limits below
- 71.4 Hz
- Ports
- 2 × 250 mm
- Port area for 17 m/s
- 955 cm²
- Max. port velocity
- 16.5 m/s
- Port length
- 67.5 cm
- at 1,200 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) | 0.385 | 0.385 | consistent |
| EBP from Fs and Qes | EBP = Fs / Qes | 81.68 | 81.683 | consistent |
| Vd from Sd and Xmax | Vd = Sd · Xmax | 1.45 | 1.452 | consistent |
| Xmax, geometric | Xmax = (winding height − gap depth) / 2 | 12 | 9.5 | different definition |
Manufacturers define Xmax differently. A deviation from the purely geometric formula is not an error, but shows that a different definition was used.
Power handling
Link to section “Power handling”- AES1,200 W
- Programme power2,400 W
- Peak power4,800 W
AES test according to the datasheet: pink noise, band-pass 30–300 Hz at 12 dB/octave, driver suspended in free air, two hours at rated power.
Sources disagree: Peak-to-peak excursion
- 60 – PDF p. 3 (body text: peak to peak travel of 60mm)
- 64 – PDF p. 4 (feature list: 64 mm peak-to-peak travel)
The datasheet gives two different values for the maximum peak-to-peak excursion. Which one applies cannot be determined from the document; we adopt neither of them as a specification.
Build plans with this driver
Link to section “Build plans with this driver”Sources
Link to section “Sources”-
Tier A · primary source
BR18XS – 18” Bass Reflex Enclosure suitable for Colossus Prime 18XS (build plan PDF)
Fane International Ltd. · 2019 · accessed on 13 September 2026
10 pages: build notes, datasheet of the Colossus Prime 18XS (pp. 3–4), simulated curves (p. 5), drawings (pp. 6–10). Printed © 2019 and code 111019.
BR18XS-Bauplan mit Datenblatt des Colossus Prime 18XS (S. 3–4) · Linking only – copying not permitted