Sica 18 PFS 4

18" · 8 Ω · 1200 W · 95.1 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	8 Ω
Fs	28.7 Hz
Qts	0.37
Qes	0.41
Qms	4.31
Vas	245.9 L
Sd	1164.2 cm²
Xmax	9.5 mm
Re	5.68 Ω
Bl	24.6 T·m
Mms	240.2 g
Pe	1200 W
Sensitivity	95.1 dB

Alignment hint

EBP	70 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 92.7 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
JBL 2269H	28 -0.7	0.361 -0.01	237 -8.9	10.6 +1.1	95 -0.1	close		+
B&C 18 PS 100 8 Ohms	30 +1.3	0.376 +0.01	245 -0.9	8 -1.5	95.8 +0.7	close	Xmax 8 mm < 9.5 mm: lower excursion-limited SPL	+
BMS 18N850vv2	29.8 +1.1	0.33 -0.04	243 -2.9	12 +2.5	95 -0.1	close		+
B&C 18PS100	30 +1.3	0.39 +0.02	245 -0.9	8 -1.5	95.5 +0.4	close	700 W vs 1200 W: lower power handling · Xmax 8 mm < 9.5 mm: lower excursion-limited SPL	+
BMS 18N830V2	31 +2.3	0.37 =	262 +16.1	8 -1.5	94.9 -0.2	close	6 Ω vs 8 Ω: amp load changes · 550 W vs 1200 W: lower power handling · Xmax 8 mm < 9.5 mm: lower excursion-limited SPL	+
Fane COLOSSUS PRIME 18XS	33 +4.3	0.385 +0.02	257 +11.1	12 +2.5	95.4 +0.3	close		+
BMS 18N830vv2	31 +2.3	0.37 =	262 +16.1	8 -1.5	96 +0.9	close	Xmax 8 mm < 9.5 mm: lower excursion-limited SPL	+
Beyma 18P1000	32 +3.3	0.362 -0.01	245 -0.9	8 -1.5	96.5 +1.4	close	Xmax 8 mm < 9.5 mm: lower excursion-limited SPL	+
Beyma 18G550 (prodance)	29.5 +0.8	0.382 +0.01	291 +45.1	9 -0.5	96.7 +1.6	close	900 W vs 1200 W: lower power handling · Xmax 9 mm < 9.5 mm: lower excursion-limited SPL	+
Lavoce SAF184.03	30 +1.3	0.32 -0.05	260 +14.1	13 +3.5	94.9 -0.2	close		+

Compare the closest 3 against the 18 PFS 4 →

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.