JBL GT5-15

15" · 4 Ω · 300 W · 90 dB

Thiele-Small parameters

Nominal size	15"
Impedance	4 Ω
Fs	27.3 Hz
Qts	0.671
Qes	0.76
Qms	5.7
Vas	106.5 L
Sd	855 cm²
Xmax	6.3 mm
Re	3.63 Ω
Bl	16.4 T·m
Mms	327 g
Pe	300 W
Sensitivity	90 dB

Alignment hint

EBP	36 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 963.7 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
Sony XS-L156P5	25 -2.3	0.622 -0.05	109.9 +3.4	5.5 -0.8	90.2 +0.2	close	Xmax 5.5 mm < 6.3 mm: lower excursion-limited SPL	+
Dayton Audio UMII15-22	29 +1.7	0.701 +0.03	96 -10.5	9.3 +3	88.5 -1.5	close	8 Ω vs 4 Ω: amp load changes	+
Sony XS-L154P5B	25.6 -1.7	0.607 -0.06	132.4 +25.9	5.6 -0.7	90.4 +0.4	usable	Xmax 5.6 mm < 6.3 mm: lower excursion-limited SPL	+
Monacor SONIC 15 MK2	22 -5.3	0.577 -0.09	119 +12.5	6.3 =	88.2 -1.8	usable		+
MTX Audio T615-44	26.2 -1.1	0.498 -0.17	113 +6.5	5.6 -0.7	88.8 -1.2	usable	8 Ω vs 4 Ω: amp load changes · Xmax 5.6 mm < 6.3 mm: lower excursion-limited SPL	+
DD Audio 615 D2	32.3 +5	0.689 +0.02	81.6 -24.9	5 -1.3	90.5 +0.5	usable	8 Ω vs 4 Ω: amp load changes · Xmax 5 mm < 6.3 mm: lower excursion-limited SPL	+
JBL P1520	25.4 -1.9	0.502 -0.17	118.9 +12.4	8.1 +1.8	90.8 +0.8	usable		+
JBL P1520e	25.4 -1.9	0.502 -0.17	118.9 +12.4	8.1 +1.8	90.8 +0.8	usable		+
American Bass DX 15	30.4 +3.1	0.56 -0.11	89.6 -16.9	15 +8.7	90 =	usable		+
Rockford Fosgate T0D415	26.2 -1.1	0.521 -0.15	94.4 -12.1	9.7 +3.4	88 -2	usable	8 Ω vs 4 Ω: amp load changes	+

Compare the closest 3 against the GT5-15 →

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.