JBL GTO 1214

12" · 4 Ω · 350 W · 89.4 dB

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	28 Hz
Qts	0.469
Qes	0.49
Qms	10.7
Vas	58.2 L
Sd	511 cm²
Xmax	7.3 mm
Re	3.76 Ω
Bl	16.6 T·m
Mms	203.2 g
Pe	350 W
Sensitivity	89.4 dB

Alignment hint

EBP	57 · 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
Wavecor SW312WA03	28 =	0.479 +0.01	61 +2.8	7.3 =	90.2 +0.8	close	250 W vs 350 W: lower power handling	+
Infinity 120.3SE	28.4 +0.4	0.475 +0.01	55.6 -2.6	6.8 -0.5	89.5 +0.1	close	Xmax 6.8 mm < 7.3 mm: lower excursion-limited SPL	+
Monacor BLACKBASS-12 4 Ohms	29 +1	0.482 +0.01	61 +2.8	7.5 +0.2	90.1 +0.7	close		+
Rockford Fosgate P3D2-12	26.5 -1.5	0.491 +0.02	57.7 -0.5	9.5 +2.2	89 -0.4	close		+
Oxygen AIR2 300	26.7 -1.3	0.452 -0.02	62.9 +4.7	8.8 +1.5	89.5 +0.1	close		+
Monacor BLACKBASS-12 8 Ohms	29 +1	0.482 +0.01	61 +2.8	7.5 +0.2	87.1 -2.3	close	8 Ω vs 4 Ω: amp load changes	+
Focal P30F	28 =	0.467 =	70 +11.8	9.1 +1.8	90.1 +0.7	close		+
JL Audio 13TW5V2-2	27.6 -0.4	0.526 +0.06	60.3 +2.1	9 +1.7	89.2 -0.2	close		+
Dayton Audio TS320D-4 TITANIC MK 4	28.3 +0.3	0.453 -0.02	64.1 +5.9	9.8 +2.5	90.7 +1.3	close		+
Rockford Fosgate T1D212	28 =	0.522 +0.05	55.8 -2.4	10.9 +3.6	89.1 -0.3	close		+

Compare the closest 3 against the GTO 1214 →

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.