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Rockford Fosgate P2D4-12

12" · 8 Ω · 400 W · 86.8 dB · datasheet ↗

Thiele-Small parameters

Nominal size12"
Impedance8 Ω
Fs27 Hz
Qts0.581
Qes0.62
Qms9.3
Vas70.3 L
Sd510 cm²
Xmax10.1 mm
Re5.9 Ω
Bl17.1 T·m
Mms180.2 g
Pe400 W
Sensitivity86.8 dB

Alignment hint

EBP44 · sealed
Sealed Vb (Qtc ≈ 0.71)≈ 146.1 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

DriverFs (Hz)QtsVas (L)Xmax (mm)Sens (dB)FitNotesCompare
Dayton Audio UM12-2224.9 -2.10.589 +0.0171.6 +1.312.5 +2.487.7 +0.9close4 Ω vs 8 Ω: amp load changes+
JL Audio 12W1V3-226.55 -0.450.52 -0.0672 +1.711 +0.985.9 -0.9close2 Ω vs 8 Ω: amp load changes · 300 W vs 400 W: lower power handling+
Audio System HX12 SQ28.2 +1.20.5 -0.0868 -2.311.8 +1.786.1 -0.7close4 Ω vs 8 Ω: amp load changes+
Dayton Audio RSS315HFA-825 -20.526 -0.0575 +4.79.9 -0.285.5 -1.3closeXmax 9.9 mm < 10.1 mm: lower excursion-limited SPL+
JL Audio 12W1V3-426.21 -0.790.5 -0.0876.63 +6.3311 +0.986.1 -0.7close4 Ω vs 8 Ω: amp load changes · 300 W vs 400 W: lower power handling+
Wavecor SW310WA0128.5 +1.50.603 +0.0265.5 -4.87.6 -2.586.8 =close250 W vs 400 W: lower power handling · Xmax 7.6 mm < 10.1 mm: lower excursion-limited SPL+
Sound Storm Labs CR12D30.7 +3.70.522 -0.0666.9 -3.410.3 +0.287.5 +0.7close+
JL Audio 12W0V3-428.4 +1.40.67 +0.0971.6 +1.39.3 -0.888.3 +1.5close300 W vs 400 W: lower power handling · Xmax 9.3 mm < 10.1 mm: lower excursion-limited SPL+
Alpine SWA-12S430 +30.49 -0.0967.79 -2.5110 -0.187.2 +0.4close4 Ω vs 8 Ω: amp load changes · 250 W vs 400 W: lower power handling · Xmax 10 mm < 10.1 mm: lower excursion-limited SPL+
Rockford Fosgate T1D41229.2 +2.20.613 +0.0355.8 -14.510.9 +0.885.8 -1close+

Compare the closest 3 against the P2D4-12 →

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.