JBL GT3-12

12" · 4 Ω · 225 W · 91.8 dB

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	28.2 Hz
Qts	0.541
Qes	0.6
Qms	5.53
Vas	100.5 L
Sd	527 cm²
Xmax	8.2 mm
Re	3.14 Ω
Bl	10.7 T·m
Mms	123.5 g
Pe	225 W
Sensitivity	91.8 dB

Alignment hint

EBP	47 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 141.9 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
JL Audio 12WX-4	27 -1.2	0.562 +0.02	94.5 -6	8.5 +0.3	90.5 -1.3	close		+
MTX Audio T4124A	29.3 +1.1	0.549 +0.01	118.8 +18.3	8.4 +0.2	92.9 +1.1	close		+
Rockford Fosgate P1S412	25 -3.2	0.537 =	109 +8.5	9 +0.8	90.4 -1.4	close		+
Kicker ES124	30.4 +2.2	0.549 +0.01	97.7 -2.8	6.2 -2	92.2 +0.4	close	125 W vs 225 W: lower power handling · Xmax 6.2 mm < 8.2 mm: lower excursion-limited SPL	+
Morel PRIMO 12	28 -0.2	0.474 -0.07	85 -15.5	8 -0.2	91.5 -0.3	close	Xmax 8 mm < 8.2 mm: lower excursion-limited SPL	+
Alpine SWE-1244E	31 +2.8	0.53 -0.01	102.5 +2	7.5 -0.7	88.7 -3.1	close	Xmax 7.5 mm < 8.2 mm: lower excursion-limited SPL	+
Cerwin-Vega HED-12 4	28 -0.2	0.565 +0.02	105 +4.5	6 -2.2	90.7 -1.1	close	Xmax 6 mm < 8.2 mm: lower excursion-limited SPL	+
Focal 33V2	28.7 +0.5	0.537 =	76.2 -24.3	7.5 -0.7	92.5 +0.7	close	Xmax 7.5 mm < 8.2 mm: lower excursion-limited SPL	+
Hertz Audio DS 30.3	29 +0.8	0.51 -0.03	94 -6.5	9 +0.8	87.7 -4.1	close		+
Rockford Fosgate P112S4	25 -3.2	0.52 -0.02	110 +9.5	7.3 -0.9	90.6 -1.2	close	150 W vs 225 W: lower power handling · Xmax 7.3 mm < 8.2 mm: lower excursion-limited SPL	+

Compare the closest 3 against the GT3-12 →

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.