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Sica

Sica 15 S 4 PL

Sica 15 S 4 PL: 15″ driver with neodymium motor, 4″ voice coil, 1200 W AES and 97.8 dB – at a weight of 7 kg intended for portable systems.

Current · Last checked: 2026-09-28

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Schematic cross-section: 15″ driver with neodymium motor Side section: on the left the motor with a compact neodymium magnet, pole piece and top plate with the air gap. The voice coil sits in the gap on its former, held by the spider. To the right the cone opens out with its dust cap, with the surround at the edge of the basket. The drawing shows the construction, not the dimensions of a particular model.
Schematic cross-section of a driver with a neodymium motor. The drawing shows the construction, not the dimensions of this model; the manufacturer has a product photo.

General data

Link to section “General data”
Type
Woofer
Nominal size
15″
Nominal impedance
8 Ω Manufacturer
Minimum impedance
not available
Sensitivity
97.8 dB 1 W / 1 m Manufacturer
Frequency range
35 Hz – 2,000 Hz Manufacturer
Voice coil Ø
100 mm Manufacturer
Winding height
27 mm Manufacturer
Gap depth
not available
Flux density
not available
Magnet
neodymium
Weight
7 kg Manufacturer
Baffle cut-out Ø
355 mm Manufacturer
Overall diameter
388 mm Manufacturer
Mounting depth
177 mm Manufacturer
Displacement
not available
Recommended enclosure volume
not available

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.

Bass reflex Calculated

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 119.7.

Net volume
101 L
Tuning frequency
48 Hz
F3 (−3 dB)
45.3 Hz
F6 (−6 dB)
41 Hz
F10 (−10 dB)
36.4 Hz
Sensitivity (2.83 V / 1 m)
97.8 dB
Max. SPL at 45.3 Hz
125.7 dB
Max. SPL at 90.6 Hz
128.3 dB
Xmax limits below
91.7 Hz
Ports
1 × 250 mm
Port area for 17 m/s
650 cm²
Max. port velocity
22.5 m/s
Port length
44.7 cm
1020501002005001k708090100110120130140Frequency (Hz)Level (dB SPL)
  • 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.

Open in the designer

Thiele-Small parameters

Link to section “Thiele-Small parameters”

Small-signal parameters as stated by the manufacturer. They change with temperature and level.

Fs
39.5 Hz
Re
5.1 Ω
Le
1.38 mH (at 1,000 Hz)
Qts
0.32
Qes
0.33
Qms
15.87
Vas
127.6 L
BL
22.5 T·m
Mms
132 g
Cms
0.123 mm/N
Sd
855 cm²
Xmax
10 mm
Xdamage
14 mm
Vd
not available
EBP
not available
Efficiency η₀
2.3 %

Plausibility check

Link to section “Plausibility check”

We recalculate dependent values from the datasheet. We flag deviations above 3 %.

Recalculated parameters
CheckFormula DatasheetCalculatedResult
Qts from Qes and Qms Qts = Qes · Qms / (Qes + Qms) 0.32 0.323 consistent

Power handling

Link to section “Power handling”
  • AES1,200 W
  • Programme power2,400 W

Sources

Link to section “Sources”
  1. Tier A · primary source

    Sica 15 S 4 PL (8 Ω) – Product page with Thiele-Small parameters

    Sica S.r.l. · accessed on 28 September 2026