JBL GT2-12

12" · 4 Ω · 220 W · 94.1 dB

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	29.5 Hz
Qts	0.42
Qes	0.44
Qms	9.35
Vas	114.9 L
Sd	522.8 cm²
Xmax	8 mm
Re	3.3 Ω
Bl	11.6 T·m
Mms	97.1 g
Pe	220 W
Sensitivity	94.1 dB

Alignment hint

EBP	67 · 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
JBL P1200	30 +0.5	0.45 +0.03	123 +8.1	7.8 -0.2	92.8 -1.3	close	8 Ω vs 4 Ω: amp load changes · Xmax 7.8 mm < 8 mm: lower excursion-limited SPL	+
McCauley 6232	35 +5.5	0.411 -0.01	106.2 -8.7	8.4 +0.4	93.6 -0.5	close	8 Ω vs 4 Ω: amp load changes	+
Oxygen IN12 300	27 -2.5	0.362 -0.06	114.8 -0.1	8.7 +0.7	93.2 -0.9	close		+
Dayton Audio QU4TRO 12"	27 -2.5	0.357 -0.06	120.1 +5.2	8.7 +0.7	93.6 -0.5	close		+
GRS 12PT-8	35 +5.5	0.387 -0.03	112 -2.9	7.8 -0.2	93 -1.1	close	8 Ω vs 4 Ω: amp load changes · Xmax 7.8 mm < 8 mm: lower excursion-limited SPL	+
Dayton Audio ST305-8	29.6 +0.1	0.348 -0.07	128.1 +13.2	8 =	92.9 -1.2	close	8 Ω vs 4 Ω: amp load changes	+
MCM Electronics 55-2982	36.2 +6.7	0.407 -0.01	121.7 +6.8	7 -1	93.9 -0.2	close	8 Ω vs 4 Ω: amp load changes · Xmax 7 mm < 8 mm: lower excursion-limited SPL	+
Hertz Audio ES 300	28 -1.5	0.38 -0.04	89.4 -25.5	9 +1	94 -0.1	close		+
Focal 33S	25.9 -3.6	0.464 +0.04	107.9 -7	7.5 -0.5	92.8 -1.3	close	Xmax 7.5 mm < 8 mm: lower excursion-limited SPL	+
Faital PRO 12FE330	33 +3.5	0.45 +0.03	146.7 +31.8	8.32 +0.32	94 -0.1	close	8 Ω vs 4 Ω: amp load changes	+

Compare the closest 3 against the GT2-12 →

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.