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Rockford Fosgate S1-124

12" · 4 Ω · 300 W · 96.2 dB · datasheet ↗

Thiele-Small parameters

Nominal size12"
Impedance4 Ω
Fs28 Hz
Qts0.326
Qes0.36
Qms3.41
Vas186 L
Sd545 cm²
Xmax9.9 mm
Re3.4 Ω
Bl11 T·m
Mms72.3 g
Pe300 W
Sensitivity96.2 dB

Alignment hint

EBP78 · flexible
Sealed Vb (Qtc ≈ 0.71)≈ 50.2 L

EBP 50-100: works in either a sealed or ported alignment.

Rules of thumb from T/S parameters only. Verify against a real simulation before cutting wood.

Substitute candidates

DriverFs (Hz)QtsVas (L)Xmax (mm)Sens (dB)FitNotesCompare
Westra SW-300-280830 +20.322 =209 +239.3 -0.694.7 -1.5close8 Ω vs 4 Ω: amp load changes · Xmax 9.3 mm < 9.9 mm: lower excursion-limited SPL+
Visaton TD130.3 +2.30.327 =200 +147.6 -2.395.3 -0.9close8 Ω vs 4 Ω: amp load changes · 150 W vs 300 W: lower power handling · Xmax 7.6 mm < 9.9 mm: lower excursion-limited SPL+
Visaton WS33NG30 +20.308 -0.02190 +48 -1.994.5 -1.7close8 Ω vs 4 Ω: amp load changes · 200 W vs 300 W: lower power handling · Xmax 8 mm < 9.9 mm: lower excursion-limited SPL+
Focal 12V 726DB25.9 -2.10.354 +0.03210.5 +24.58.5 -1.496 -0.2close150 W vs 300 W: lower power handling · Xmax 8.5 mm < 9.9 mm: lower excursion-limited SPL+
Visaton TD31 +30.324 =200 +147.3 -2.695.5 -0.7close8 Ω vs 4 Ω: amp load changes · 150 W vs 300 W: lower power handling · Xmax 7.3 mm < 9.9 mm: lower excursion-limited SPL+
Jensen RS12045SW25 -30.3 -0.03220 +3411 +1.195.6 -0.6close+
Cabasse 30M2231.5 +3.50.315 -0.01196.1 +10.18 -1.997.7 +1.5close8 Ω vs 4 Ω: amp load changes · 200 W vs 300 W: lower power handling · Xmax 8 mm < 9.9 mm: lower excursion-limited SPL+
Dayton Audio ST305-8 S&eacute;ries II26.2 -1.80.334 +0.01164 -228 -1.992.3 -3.9usable8 Ω vs 4 Ω: amp load changes · Xmax 8 mm < 9.9 mm: lower excursion-limited SPL+
Magnat SUPREME 300029 +10.31 -0.02131 -558 -1.996.4 +0.2usableXmax 8 mm < 9.9 mm: lower excursion-limited SPL+
Dayton Audio 12 DVC25 -30.347 +0.02147.3 -38.715.5 +5.694 -2.2usable+

Compare the closest 3 against the S1-124 →

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.