Sica 18 K 4 PL

18" · 8 Ω · 1200 W · 97.8 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	8 Ω
Fs	36.8 Hz
Qts	0.32
Qes	0.35
Qms	4.62
Vas	201 L
Sd	1164.2 cm²
Xmax	6.5 mm
Re	6 Ω
Bl	26.8 T·m
Mms	178.8 g
Pe	1200 W
Sensitivity	97.8 dB

Alignment hint

EBP	105 · ported
Sealed Vb (Qtc ≈ 0.71)	≈ 51.8 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
Beyma 18P1200Nd	37 +0.2	0.339 +0.02	198 -3	8.4 +1.9	98.3 +0.5	close		+
PD PDN 18SB40	38.5 +1.7	0.326 +0.01	201.3 +0.3	6 -0.5	98.6 +0.8	close	600 W vs 1200 W: lower power handling · Xmax 6 mm < 6.5 mm: lower excursion-limited SPL	+
Precision Devices PDN 18SB40	38.5 +1.7	0.326 +0.01	201.3 +0.3	6 -0.5	98.6 +0.8	close	600 W vs 1200 W: lower power handling · Xmax 6 mm < 6.5 mm: lower excursion-limited SPL	+
Fane COLOSSUS 18XT5N	36 -0.8	0.331 +0.01	185 -16	8.4 +1.9	97.4 -0.4	close		+
Faital PRO 18HP1022	35 -1.8	0.3 -0.02	204.9 +3.9	9.5 +3	98 +0.2	close		+
Oberton 18XB700	36.1 -0.7	0.304 -0.02	183.22 -17.78	9 +2.5	98 +0.2	close		+
18 Sound 18LW2420	34 -2.8	0.31 -0.01	208 +7	10 +3.5	98 +0.2	close	4 Ω vs 8 Ω: amp load changes	+
18 Sound 18LW1400	33 -3.8	0.32 =	210 +9	9 +2.5	97 -0.8	close	4 Ω vs 8 Ω: amp load changes	+
Fane 18-800N	38 +1.2	0.306 -0.01	217 +16	7.1 +0.6	99.5 +1.7	close	800 W vs 1200 W: lower power handling	+
Beyma 18G50	40 +3.2	0.321 =	212 +11	6 -0.5	99.3 +1.5	close	750 W vs 1200 W: lower power handling · Xmax 6 mm < 6.5 mm: lower excursion-limited SPL	+

Compare the closest 3 against the 18 K 4 PL →

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.