Powerbass S-1204D

12" · 4 Ω · 300 W · 87.2 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	31 Hz
Qts	0.5
Qes	0.563
Qms	4.5
Vas	65 L
Sd	511 cm²
Xmax	9.5 mm
Re	1.59 Ω
Bl	9.1 T·m
Mms	150.5 g
Pe	300 W
Sensitivity	87.2 dB

Alignment hint

EBP	55 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 65 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

Driver	Fs (Hz)	Qts	Vas (L)	Xmax (mm)	Sens (dB)	Fit	Notes	Compare
Alpine SWA-12S4	30 -1	0.49 -0.01	67.79 +2.79	10 +0.5	87.2 =	close		+
Sound Storm Labs CR12D	30.7 -0.3	0.522 +0.02	66.9 +1.9	10.3 +0.8	87.5 +0.3	close	8 Ω vs 4 Ω: amp load changes	+
Audio System HX12 SQ	28.2 -2.8	0.5 =	68 +3	11.8 +2.3	86.1 -1.1	close		+
Infinity PRIMUS 1270	29.7 -1.3	0.49 -0.01	75.7 +10.7	11.3 +1.8	87.3 +0.1	close		+
Rockford Fosgate P3D4-12	27.7 -3.3	0.517 +0.02	57.7 -7.3	9.4 -0.1	86.3 -0.9	close	8 Ω vs 4 Ω: amp load changes · Xmax 9.4 mm < 9.5 mm: lower excursion-limited SPL	+
Monacor BLACKBASS-12 8 Ohms	29 -2	0.482 -0.02	61 -4	7.5 -2	87.1 -0.1	close	8 Ω vs 4 Ω: amp load changes · Xmax 7.5 mm < 9.5 mm: lower excursion-limited SPL	+
Infinity KAPPA 1200W	26.5 -4.5	0.496 =	64.47 -0.53	12.75 +3.25	85.1 -2.1	close	2 Ω vs 4 Ω: amp load changes	+
Audiomobile ELITE 2212	28 -3	0.48 -0.02	59.46 -5.54	12.7 +3.2	85.8 -1.4	close		+
Rockford Fosgate P3D2-12	26.5 -4.5	0.491 -0.01	57.7 -7.3	9.5 =	89 +1.8	close		+
Dayton Audio UMII12-22	31 =	0.564 +0.06	53 -12	10 +0.5	88.2 +1	close	8 Ω vs 4 Ω: amp load changes	+

Compare the closest 3 against the S-1204D →

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.