JBL W12GTi MKII

12" · 4 Ω · 700 W · 90.1 dB

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	31.8 Hz
Qts	0.508
Qes	0.55
Qms	6.68
Vas	44.8 L
Sd	480 cm²
Xmax	9.9 mm
Re	3.2 Ω
Bl	14.5 T·m
Mms	180.4 g
Pe	700 W
Sensitivity	90.1 dB

Alignment hint

EBP	58 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 47.8 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 W12GTI	31.8 =	0.508 =	44.8 =	9.9 =	90.1 =	close		+
JBL W12GTIe	31.8 =	0.508 =	44.8 =	9.9 =	90.1 =	close		+
Alpine 1242D	29 -2.8	0.47 -0.04	45 +0.2	9.1 -0.8	91.4 +1.3	close	Xmax 9.1 mm < 9.9 mm: lower excursion-limited SPL	+
Dayton Audio UMII12-22	31 -0.8	0.564 +0.06	53 +8.2	10 +0.1	88.2 -1.9	close	8 Ω vs 4 Ω: amp load changes	+
Pioneer TS-W306DVC	32.9 +1.1	0.478 -0.03	51.8 +7	8.3 -1.6	88.9 -1.2	close	8 Ω vs 4 Ω: amp load changes · 400 W vs 700 W: lower power handling · Xmax 8.3 mm < 9.9 mm: lower excursion-limited SPL	+
Rockford Fosgate T1D212	28 -3.8	0.522 +0.01	55.8 +11	10.9 +1	89.1 -1	close		+
Hertz Audio HX 300	33 +1.2	0.47 -0.04	49.62 +4.82	14 +4.1	87.1 -3	close		+
Dayton Audio TITANIC	36.3 +4.5	0.506 =	44 -0.8	7.4 -2.5	92 +1.9	close	500 W vs 700 W: lower power handling · Xmax 7.4 mm < 9.9 mm: lower excursion-limited SPL	+
Monacor RAPTOR 12 MK2	34 +2.2	0.523 +0.02	32 -12.8	10.1 +0.2	89.2 -0.9	close		+
Pioneer TS-W307D4	34.8 +3	0.52 +0.01	40.9 -3.9	7.4 -2.5	91.3 +1.2	usable	400 W vs 700 W: lower power handling · Xmax 7.4 mm < 9.9 mm: lower excursion-limited SPL	+

Compare the closest 3 against the W12GTi MKII →

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.