18 Sound 15W700
15″ woofer from 18 Sound with 3″ voice coil – Thiele-Small parameters from the application note of the 15″ two-way kit.
Availability not checked · Last checked: 2026-09-13
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General data
Link to section “General data”- Type
- Woofer
- Nominal size
- 15″
- Nominal impedance
- 8 Ω Manufacturer
- Minimum impedance
- not available
- Sensitivity
- 99 dB Manufacturer
- Frequency range
- 38 Hz – 5,000 Hz Manufacturer
- Voice coil Ø
- 75 mm Manufacturer
- Winding height
- not available
- Gap depth
- not available
- Flux density
- not available
- Magnet
- not available
- Weight
- 8.6 kg Manufacturer
- Baffle cut-out Ø
- 353 mm Manufacturer
- Overall diameter
- 387 mm Manufacturer
- Mounting depth
- 168 mm Manufacturer
- Displacement
- not available
- Recommended enclosure volume
- 80 – 140 L Manufacturer
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 above 100 – by the rule of thumb, this points to a vented enclosure (bass reflex). This is based on an EBP of 115.2.
- Net volume
- 145 L
- Tuning frequency
- 49 Hz
- F3 (−3 dB)
- 46.9 Hz
- F6 (−6 dB)
- 42.3 Hz
- F10 (−10 dB)
- 37.4 Hz
- Sensitivity (2.83 V / 1 m)
- 99.1 dB
- Max. SPL at 46.9 Hz
- 122.7 dB
- Max. SPL at 93.7 Hz
- 125 dB
- Xmax limits below
- 97.2 Hz
- Ports
- 1 × 250 mm
- Port area for 17 m/s
- 436 cm²
- Max. port velocity
- 15.1 m/s
- Port length
- 23.8 cm
- at 450 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) | 0.3 | 0.304 | consistent |
Power handling
Link to section “Power handling”- Continuous power (standard not stated)450 W
Sources disagree: Cone area Sd
- 0,0085 m² (= 85 cm²) – PDF p. 2
- 131,75 in² (≈ 850 cm²) – PDF p. 2 Adopted
The metric value is too small by a factor of 10 – a typo (0.0085 instead of 0.085 m²). The inch value corresponds to roughly 850 cm², which fits a 15″ driver. We use the converted inch value.
Sources disagree: Sensitivity
- 99 dB (ohne Bezug) – PDF p. 2
- 97,8 dB (Ref. Efficiency 1 W/1 m, Halbraum) – PDF p. 2
The datasheet gives two different values. The second is calculated from the Thiele-Small parameters; for the 99 dB the reference is missing. We show both.
Build plans with this driver
Link to section “Build plans with this driver”Sources
Link to section “Sources”-
Tier A · primary source
2 Ways 15” Loudspeaker System – Application Note (18sound_15 2ways.pdf)
Eighteen Sound Srl · 2013 · accessed on 13 September 2026
Printed © 2013; PDF metadata 2015-07-13. Contains datasheets for the 15W700, ND1460 and XT1464.
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Tier A · primary source
18 Sound 15W700 (8 Ω) – Product page
Eighteen Sound S.r.l. · accessed on 13 November 2026