Infinity 120.3SE

12" · 4 Ω · 300 W · 89.5 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	28.4 Hz
Qts	0.475
Qes	0.51
Qms	6.82
Vas	55.6 L
Sd	517 cm²
Xmax	6.8 mm
Re	3.56 Ω
Bl	16.2 T·m
Mms	211.2 g
Pe	300 W
Sensitivity	89.5 dB

Alignment hint

EBP	56 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 45.7 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 GTO 1214	28 -0.4	0.469 -0.01	58.2 +2.6	7.3 +0.5	89.4 -0.1	close		+
Wavecor SW312WA03	28 -0.4	0.479 =	61 +5.4	7.3 +0.5	90.2 +0.7	close		+
Monacor BLACKBASS-12 4 Ohms	29 +0.6	0.482 +0.01	61 +5.4	7.5 +0.7	90.1 +0.6	close		+
JBL S3-1224	29.1 +0.7	0.473 =	52.6 -3	6 -0.8	88.4 -1.1	close	8 Ω vs 4 Ω: amp load changes · Xmax 6 mm < 6.8 mm: lower excursion-limited SPL	+
Fountek FW323 - 4 Ohms	30 +1.6	0.452 -0.02	51.4 -4.2	6.6 -0.2	89.7 +0.2	close	Xmax 6.6 mm < 6.8 mm: lower excursion-limited SPL	+
JBL STADIUM 1224	29.7 +1.3	0.473 =	52.6 -3	6 -0.8	88.7 -0.8	close	8 Ω vs 4 Ω: amp load changes · Xmax 6 mm < 6.8 mm: lower excursion-limited SPL	+
Rockford Fosgate P3D2-12	26.5 -1.9	0.491 +0.02	57.7 +2.1	9.5 +2.7	89 -0.5	close		+
Rockford Fosgate T1D212	28 -0.4	0.522 +0.05	55.8 +0.2	10.9 +4.1	89.1 -0.4	close		+
Monacor BLACKBASS-12 8 Ohms	29 +0.6	0.482 +0.01	61 +5.4	7.5 +0.7	87.1 -2.4	close	8 Ω vs 4 Ω: amp load changes	+
Monacor SONIC 12 vp	27 -1.4	0.469 -0.01	51 -4.6	6.3 -0.5	88.1 -1.4	close	8 Ω vs 4 Ω: amp load changes · Xmax 6.3 mm < 6.8 mm: lower excursion-limited SPL	+

Compare the closest 3 against the 120.3SE →

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.