JBL S2-1224

12" · 8 Ω · 275 W · 89.1 dB

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	32.4 Hz
Qts	0.581
Qes	0.72
Qms	3.02
Vas	59.7 L
Sd	522.8 cm²
Xmax	5.3 mm
Re	4.4 Ω
Bl	13.9 T·m
Mms	154.9 g
Pe	275 W
Sensitivity	89.1 dB

Alignment hint

EBP	45 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 124.1 L

EBP < 50: favours a sealed (closed) 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
Focal R-300S	32.6 +0.2	0.582 =	53.9 -5.8	6 +0.7	89.6 +0.5	close	4 Ω vs 8 Ω: amp load changes	+
MTX Audio RTS12-04	33.5 +1.1	0.631 +0.05	58.4 -1.3	5.8 +0.5	89.5 +0.4	close	4 Ω vs 8 Ω: amp load changes	+
Klipsch SPL-120	31.1 -1.3	0.507 -0.07	58.4 -1.3	5.7 +0.4	89 -0.1	close	200 W vs 275 W: lower power handling	+
Hertz Audio ES F30.5	38 +5.6	0.6 +0.02	60 +0.3	6 +0.7	88.6 -0.5	close	4 Ω vs 8 Ω: amp load changes	+
JBL STAGE 1210	31.7 -0.7	0.55 -0.03	64.6 +4.9	6.6 +1.3	90.8 +1.7	close	4 Ω vs 8 Ω: amp load changes	+
Alpine SWS-1241	30 -2.4	0.563 -0.02	65 +5.3	6.7 +1.4	90.1 +1	close	4 Ω vs 8 Ω: amp load changes · 200 W vs 275 W: lower power handling	+
JBL GT5-12 vp	29 -3.4	0.582 =	54.2 -5.5	6.7 +1.4	88.1 -1	close		+
MTX Audio T5512-04	29.3 -3.1	0.583 =	66.9 +7.2	7.3 +2	89.8 +0.7	close	4 Ω vs 8 Ω: amp load changes	+
Rockford Fosgate R2D4-12	34.9 +2.5	0.605 +0.02	68.8 +9.1	6.5 +1.2	88.9 -0.2	close		+
MTX Audio XT12-04	33 +0.6	0.56 -0.02	66 +6.3	6.5 +1.2	91.7 +2.6	close	4 Ω vs 8 Ω: amp load changes	+

Compare the closest 3 against the S2-1224 →

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.