Alpine SWA-12S4

12" · 4 Ω · 250 W · 87.2 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	30 Hz
Qts	0.49
Qes	0.53
Qms	7.07
Vas	67.79 L
Sd	452 cm²
Xmax	10 mm
Re	3.6 Ω
Bl	12.41 T·m
Mms	120.3 g
Pe	250 W
Sensitivity	87.2 dB

Alignment hint

EBP	57 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 62.6 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
Infinity PRIMUS 1270	29.7 -0.3	0.49 =	75.7 +7.91	11.3 +1.3	87.3 +0.1	close		+
Powerbass S-1204D	31 +1	0.5 +0.01	65 -2.79	9.5 -0.5	87.2 =	close	Xmax 9.5 mm < 10 mm: lower excursion-limited SPL	+
Sound Storm Labs CR12D	30.7 +0.7	0.522 +0.03	66.9 -0.89	10.3 +0.3	87.5 +0.3	close	8 Ω vs 4 Ω: amp load changes	+
Audio System HX12 SQ	28.2 -1.8	0.5 +0.01	68 +0.21	11.8 +1.8	86.1 -1.1	close		+
Audiomobile ELITE 2212	28 -2	0.48 -0.01	59.46 -8.33	12.7 +2.7	85.8 -1.4	close		+
Infinity KAPPA 1200W	26.5 -3.5	0.496 +0.01	64.47 -3.32	12.75 +2.75	85.1 -2.1	close	2 Ω vs 4 Ω: amp load changes	+
Monacor BLACKBASS-12 8 Ohms	29 -1	0.482 -0.01	61 -6.79	7.5 -2.5	87.1 -0.1	close	8 Ω vs 4 Ω: amp load changes · Xmax 7.5 mm < 10 mm: lower excursion-limited SPL	+
JL Audio 12W1V3-2	26.55 -3.45	0.52 +0.03	72 +4.21	11 +1	85.9 -1.3	close	2 Ω vs 4 Ω: amp load changes	+
JL Audio 12W1V3-4	26.21 -3.79	0.5 +0.01	76.63 +8.84	11 +1	86.1 -1.1	close		+
Focal P30F	28 -2	0.467 -0.02	70 +2.21	9.1 -0.9	90.1 +2.9	close	Xmax 9.1 mm < 10 mm: lower excursion-limited SPL	+

Compare the closest 3 against the SWA-12S4 →

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.