JBL GT5-12 vp

12" · 8 Ω · 275 W · 88.1 dB

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	29 Hz
Qts	0.582
Qes	0.64
Qms	6.39
Vas	54.2 L
Sd	530 cm²
Xmax	6.7 mm
Re	4 Ω
Bl	15.8 T·m
Mms	218.8 g
Pe	275 W
Sensitivity	88.1 dB

Alignment hint

EBP	45 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 113.8 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
Dayton Audio UMII12-22	31 +2	0.564 -0.02	53 -1.2	10 +3.3	88.2 +0.1	close		+
Wavecor SW312WA04	29 =	0.569 -0.01	61 +6.8	7.5 +0.8	86.8 -1.3	close		+
Focal R-300S	32.6 +3.6	0.582 =	53.9 -0.3	6 -0.7	89.6 +1.5	close	4 Ω vs 8 Ω: amp load changes · Xmax 6 mm < 6.7 mm: lower excursion-limited SPL	+
Rockford Fosgate T1D412	29.2 +0.2	0.613 +0.03	55.8 +1.6	10.9 +4.2	85.8 -2.3	close		+
MTX Audio T5512-04	29.3 +0.3	0.583 =	66.9 +12.7	7.3 +0.6	89.8 +1.7	close	4 Ω vs 8 Ω: amp load changes	+
Cerwin-Vega VEGA 124	30.3 +1.3	0.612 +0.03	60.3 +6.1	7 +0.3	86.4 -1.7	close		+
Wavecor SW310WA01	28.5 -0.5	0.603 +0.02	65.5 +11.3	7.6 +0.9	86.8 -1.3	close		+
Rockford Fosgate T1D212	28 -1	0.522 -0.06	55.8 +1.6	10.9 +4.2	89.1 +1	close	4 Ω vs 8 Ω: amp load changes	+
Alpine SWS-1241	30 +1	0.563 -0.02	65 +10.8	6.7 =	90.1 +2	close	4 Ω vs 8 Ω: amp load changes · 200 W vs 275 W: lower power handling	+
Kenwood W1024DB	33 +4	0.567 -0.02	51.3 -2.9	6.9 +0.2	91 +2.9	close	4 Ω vs 8 Ω: amp load changes	+

Compare the closest 3 against the GT5-12 vp →

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.