Rockford Fosgate P1S4-15

15" · 4 Ω · 250 W · 87.3 dB · datasheet ↗

Thiele-Small parameters

Nominal size	15"
Impedance	4 Ω
Fs	23 Hz
Qts	0.55
Qes	0.664
Qms	3.2
Vas	191.5 L
Sd	876 cm²
Xmax	9 mm
Re	3.6 Ω
Bl	14.6 T·m
Mms	272.1 g
Pe	250 W
Sensitivity	87.3 dB

Alignment hint

EBP	35 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 293.3 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
Rockford Fosgate P1S2-15	23 =	0.55 =	191.5 =	9 =	87.4 +0.1	close	2 Ω vs 4 Ω: amp load changes	+
Hertz Audio ES380.1	24.2 +1.2	0.52 -0.03	183 -8.5	9 =	88.2 +0.9	close		+
Rockford Fosgate P3D4-15	22.4 -0.6	0.566 +0.02	155.8 -35.7	11 +2	87.3 =	close	8 Ω vs 4 Ω: amp load changes	+
Oxygen AIR2 380	22.7 -0.3	0.543 -0.01	202.2 +10.7	11.5 +2.5	91.6 +4.3	close		+
Rockford Fosgate P115S4	24 +1	0.62 +0.07	172 -19.5	8 -1	87.3 =	close	Xmax 8 mm < 9 mm: lower excursion-limited SPL	+
GRS 15SSW-4HE	20.7 -2.3	0.487 -0.06	196.6 +5.1	9.5 +0.5	89.8 +2.5	close	8 Ω vs 4 Ω: amp load changes	+
Powerbass M-1504	22 -1	0.442 -0.11	181.7 -9.8	11 +2	87.7 +0.4	close		+
Hertz Audio DS 38.3	23 =	0.65 +0.1	244 +52.5	9 =	87.9 +0.6	usable		+
Rockford Fosgate P2D4-15	20.9 -2.1	0.655 +0.1	219.6 +28.1	11.3 +2.3	87.3 =	usable	8 Ω vs 4 Ω: amp load changes	+
Sony XS-L151P5	22.2 -0.8	0.46 -0.09	195.9 +4.4	7 -2	88.2 +0.9	usable	Xmax 7 mm < 9 mm: lower excursion-limited SPL	+

Compare the closest 3 against the P1S4-15 →

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.