SICA 12 S 2.5 CS

12" · 8 Ω · 300 W · 94 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	33 Hz
Qts	0.265
Qes	0.27
Qms	13.8
Vas	93.7 L
Sd	490.9 cm²
Xmax	6 mm
Re	6.2 Ω
Bl	20 T·m
Mms	83.9 g
Pe	300 W
Sensitivity	94 dB

Alignment hint

EBP	122 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 15.3 L

EBP > 100: favours a ported (bass-reflex) alignment.

Rules of thumb from T/S parameters only. Verify against a real simulation before cutting wood.

Substitute candidates

Driver	Fs (Hz)	Qts	Vas (L)	Xmax (mm)	Sens (dB)	Fit	Notes	Compare
PHL Audio 4021 v2017	30 -3	0.281 +0.02	96 +2.3	7 +1	93 -1	close		+
BMS 12S305	35 +2	0.265 =	82 -11.7	11 +5	95 +1	close		+
Raveland BSW 124-II	28 -5	0.252 -0.01	91.4 -2.3	5.4 -0.6	94.7 +0.7	close	4 Ω vs 8 Ω: amp load changes · 200 W vs 300 W: lower power handling · Xmax 5.4 mm < 6 mm: lower excursion-limited SPL	+
SICA 12SR3PL	27.4 -5.6	0.27 +0.01	103.1 +9.4	7 +1	94.8 +0.8	close	4 Ω vs 8 Ω: amp load changes	+
Volt RV3143 v2014	35 +2	0.302 +0.04	86 -7.7	5.2 -0.8	93.8 -0.2	close	Xmax 5.2 mm < 6 mm: lower excursion-limited SPL	+
RCF L12P400K	33.7 +0.7	0.25 -0.02	130 +36.3	6 =	94.7 +0.7	close	200 W vs 300 W: lower power handling	+
PHL Audio 4020	29 -4	0.299 +0.03	92 -1.7	7 +1	92.1 -1.9	close		+
Mivoc AW 3000	27 -6	0.305 +0.04	97 +3.3	5.9 -0.1	93.9 -0.1	close	4 Ω vs 8 Ω: amp load changes · 180 W vs 300 W: lower power handling · Xmax 5.9 mm < 6 mm: lower excursion-limited SPL	+
Davis 39RCA15 v2024	32.8 -0.2	0.346 +0.08	99.5 +5.8	5.8 -0.2	93.4 -0.6	usable	200 W vs 300 W: lower power handling · Xmax 5.8 mm < 6 mm: lower excursion-limited SPL	+
Magnat SUB 300 SUPREME	30 -3	0.289 +0.02	110 +16.3	7.6 +1.6	95.5 +1.5	usable	4 Ω vs 8 Ω: amp load changes	+

Compare the closest 3 against the 12 S 2.5 CS →

Ranked on parameter similarity only (Qts, Fs, Vas, Xmax, sensitivity). Same nominal size required. A hint, not a simulation, model the swap before cutting or buying.

Used in enclosures (0)

No enclosure in the catalog uses this driver yet.