Sica 4 D 0.8 CS

4" · 4 Ω · 35 W · 87.5 dB · datasheet ↗

Thiele-Small parameters

Nominal size	4"
Impedance	4 Ω
Fs	140 Hz
Qts	0.92
Qes	1.18
Qms	4.2
Vas	1.2 L
Sd	44.2 cm²
Xmax	1.3 mm
Re	3 Ω
Bl	2.65 T·m
Mms	3.1 g
Pe	35 W
Sensitivity	87.5 dB

Alignment hint

EBP	119 · ported
Sealed Vb (Qtc ≈ 0.71)	Qts too high

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
Sica 4 L 1 SL	108.3 -31.7	0.63 -0.29	1.2 =	2.4 +1.1	86.2 -1.3	usable	8 Ω vs 4 Ω: amp load changes	+
Eminence ALPHA 4-8	123 -17	0.75 -0.17	1.94 +0.74	2.6 +1.3	88 +0.5	usable	8 Ω vs 4 Ω: amp load changes	+
Eminence ALPHA 4-4	120 -20	0.63 -0.29	1.76 +0.56	2.6 +1.3	88 +0.5	usable		+
Faital PRO 4FE32	100 -40	0.81 -0.11	2.4 +1.2	1.83 +0.53	91 +3.5	risky	16 Ω vs 4 Ω: amp load changes	+
Faital PRO 4FE35	100 -40	0.83 -0.09	2.4 +1.2	2.73 +1.43	91 +3.5	risky	8 Ω vs 4 Ω: amp load changes	+
Faital PRO 4FE35	100 -40	1.16 +0.24	2.3 +1.1	1.83 +0.53	91 +3.5	risky	16 Ω vs 4 Ω: amp load changes	+
Faital PRO 4FE35	100 -40	0.73 -0.19	2.4 +1.2	1.73 +0.43	91 +3.5	risky		+
Sica 4 E 1 CS	118 -22	0.39 -0.53	1.3 +0.1	2.2 +0.9	90.2 +2.7	risky	8 Ω vs 4 Ω: amp load changes	+
Faital PRO 4FE32	100 -40	0.61 -0.31	2.3 +1.1	2.73 +1.43	91 +3.5	risky	8 Ω vs 4 Ω: amp load changes	+
Faital PRO 4FE32	100 -40	0.53 -0.39	2.5 +1.3	1.73 +0.43	91 +3.5	risky		+

Compare the closest 3 against the 4 D 0.8 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.