Sica 18 S 4 CP

18" · 8 Ω · 1200 W · 97.1 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	8 Ω
Fs	33 Hz
Qts	0.35
Qes	0.39
Qms	3.94
Vas	225 L
Sd	1164.2 cm²
Xmax	11 mm
Re	5.2 Ω
Bl	23.5 T·m
Mms	198.6 g
Pe	1200 W
Sensitivity	97.1 dB

Alignment hint

EBP	85 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 73 L

EBP 50-100: works in either a sealed or ported 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
Faital PRO 18XL1600	32 -1	0.36 +0.01	211.4 -13.6	12.92 +1.92	98 +0.9	close		+
B&C 18TBX100	34 +1	0.35 =	212 -13	9 -2	97 -0.1	close	Xmax 9 mm < 11 mm: lower excursion-limited SPL	+
B&C 18 TBX 100	34 +1	0.352 =	212 -13	9 -2	97.5 +0.4	close	Xmax 9 mm < 11 mm: lower excursion-limited SPL	+
RCF LF 18N405	30 -3	0.324 -0.03	227 +2	10.8 -0.2	96.7 -0.4	close	Xmax 10.8 mm < 11 mm: lower excursion-limited SPL	+
PHL Audio 7201ND	34 +1	0.355 +0.01	230 +5	8.5 -2.5	97.5 +0.4	close	Xmax 8.5 mm < 11 mm: lower excursion-limited SPL	+
RCF LF18N405	30 -3	0.32 -0.03	227 +2	14 +3	97 -0.1	close		+
Beyma 18SW1600ND	32 -1	0.33 -0.02	205.7 -19.3	10 -1	96.6 -0.5	close	Xmax 10 mm < 11 mm: lower excursion-limited SPL	+
Beyma 18LEX1000Fe	34 +1	0.38 +0.03	250 +25	11 =	98 +0.9	close		+
Eminence DEFINIMAX 4018 LF	32 -1	0.348 =	237.9 +12.9	8.6 -2.4	96.4 -0.7	close	Xmax 8.6 mm < 11 mm: lower excursion-limited SPL	+
Faital PRO 18HW1070	32 -1	0.38 +0.03	195.9 -29.1	13 +2	97 -0.1	close		+

Compare the closest 3 against the 18 S 4 CP →

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.