Hertz Audio DS 38.3

15" · 4 Ω · 300 W · 87.9 dB · datasheet ↗

Thiele-Small parameters

Nominal size	15"
Impedance	4 Ω
Fs	23 Hz
Qts	0.65
Qes	0.74
Qms	5.4
Vas	244 L
Sd	847 cm²
Xmax	9 mm
Re	3.3 Ω
Bl	11.4 T·m
Mms	198 g
Pe	300 W
Sensitivity	87.9 dB

Alignment hint

EBP	31 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 1330.2 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 P2D4-15	20.9 -2.1	0.655 +0.01	219.6 -24.4	11.3 +2.3	87.3 -0.6	close	8 Ω vs 4 Ω: amp load changes	+
Dayton Audio IB385-8	21.5 -1.5	0.588 -0.06	248.9 +4.9	12.4 +3.4	89.8 +1.9	close	8 Ω vs 4 Ω: amp load changes	+
Rockford Fosgate P1S2-15	23 =	0.55 -0.1	191.5 -52.5	9 =	87.4 -0.5	usable	2 Ω vs 4 Ω: amp load changes	+
Rockford Fosgate P1S4-15	23 =	0.55 -0.1	191.5 -52.5	9 =	87.3 -0.6	usable		+
Rockford Fosgate P115S4	24 +1	0.62 -0.03	172 -72	8 -1	87.3 -0.6	usable	200 W vs 300 W: lower power handling · Xmax 8 mm < 9 mm: lower excursion-limited SPL	+
Hertz Audio ES380.1	24.2 +1.2	0.52 -0.13	183 -61	9 =	88.2 +0.3	usable		+
Oxygen AIR2 380	22.7 -0.3	0.543 -0.11	202.2 -41.8	11.5 +2.5	91.6 +3.7	usable		+
Rockford Fosgate P3D4-15	22.4 -0.6	0.566 -0.08	155.8 -88.2	11 +2	87.3 -0.6	usable	8 Ω vs 4 Ω: amp load changes	+
Dayton Audio DCS380-4	22.9 -0.1	0.504 -0.15	233.9 -10.1	8.4 -0.6	92.9 +5	usable	Xmax 8.4 mm < 9 mm: lower excursion-limited SPL	+
Hertz Audio ES380	24 +1	0.52 -0.13	220 -24	9 =	93.7 +5.8	usable		+

Compare the closest 3 against the DS 38.3 →

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.