JBL P1520

15" · 4 Ω · 400 W · 90.8 dB

Thiele-Small parameters

Nominal size	15"
Impedance	4 Ω
Fs	25.4 Hz
Qts	0.502
Qes	0.54
Qms	7.2
Vas	118.9 L
Sd	780 cm²
Xmax	8.1 mm
Re	3.81 Ω
Bl	17.8 T·m
Mms	282 g
Pe	400 W
Sensitivity	90.8 dB

Alignment hint

EBP	47 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 120.8 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
JBL P1520e	25.4 =	0.502 =	118.9 =	8.1 =	90.8 =	close		+
JBL W15GTI	25.2 -0.2	0.476 -0.03	132.2 +13.3	10.2 +2.1	92.5 +1.7	close		+
JBL W15GTI MK2	25.2 -0.2	0.476 -0.03	132.2 +13.3	10.2 +2.1	92.5 +1.7	close		+
TC Sounds LMS R15	23.6 -1.8	0.446 -0.06	123 +4.1	12.1 +4	90.2 -0.6	close		+
Audiobahn AW1571T	28.2 +2.8	0.49 -0.01	133.088 +14.19	11 +2.9	89.2 -1.6	close		+
JBL GTO 1514	25.1 -0.3	0.484 -0.02	153.5 +34.6	7.3 -0.8	91.9 +1.1	close	Xmax 7.3 mm < 8.1 mm: lower excursion-limited SPL	+
Stereo Integrity SQL-15 15	23.8 -1.6	0.418 -0.08	115 -3.9	12.1 +4	90.9 +0.1	close		+
Rockford Fosgate T0D215	25.5 +0.1	0.438 -0.06	94.4 -24.5	9.3 +1.2	90.9 +0.1	close		+
MTX Audio T615-44	26.2 +0.8	0.498 =	113 -5.9	5.6 -2.5	88.8 -2	close	8 Ω vs 4 Ω: amp load changes · 250 W vs 400 W: lower power handling · Xmax 5.6 mm < 8.1 mm: lower excursion-limited SPL	+
MTX Audio T615-22	25.7 +0.3	0.431 -0.07	110 -8.9	7.1 -1	92.1 +1.3	close	Xmax 7.1 mm < 8.1 mm: lower excursion-limited SPL	+

Compare the closest 3 against the P1520 →

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.