Rockford Fosgate T2D212

12" · 4 Ω · 1200 W · 87.3 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	38.7 Hz
Qts	0.489
Qes	0.54
Qms	5.15
Vas	13.6 L
Sd	430 cm²
Xmax	7.1 mm
Re	3.4 Ω
Bl	22.2 T·m
Mms	322.3 g
Pe	1200 W
Sensitivity	87.3 dB

Alignment hint

EBP	72 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 12.5 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
Rockford Fosgate T2D412	39.9 +1.2	0.595 +0.11	13.6 =	7.3 +0.2	83.8 -3.5	usable	8 Ω vs 4 Ω: amp load changes	+
DD Audio 712D4	37.7 -1	0.478 -0.01	20.2 +6.6	7 -0.1	91.2 +3.9	usable	Xmax 7 mm < 7.1 mm: lower excursion-limited SPL	+
Pioneer TS-W3002D2	30 -8.7	0.549 +0.06	13.1 -0.5	4.8 -2.3	87.2 -0.1	usable	2 Ω vs 4 Ω: amp load changes · 400 W vs 1200 W: lower power handling · Xmax 4.8 mm < 7.1 mm: lower excursion-limited SPL	+
Monacor RAPTOR 12 v2014 2	43 +4.3	0.548 +0.06	17.8 +4.2	6.8 -0.3	91.6 +4.3	usable	Xmax 6.8 mm < 7.1 mm: lower excursion-limited SPL	+
MTX Audio RFL12	35 -3.7	0.353 -0.14	14.6 +1	9.3 +2.2	90.3 +3	usable		+
Monacor RAPTOR 12 v2014	43 +4.3	0.545 +0.06	22.5 +8.9	7.7 +0.6	90.7 +3.4	usable		+
MTX Audio TX812	35 -3.7	0.422 -0.07	24.6 +11	10 +2.9	91.6 +4.3	usable		+
Dayton Audio RSS315HE-22	32 -6.7	0.461 -0.03	32.4 +18.8	8.2 +1.1	88.1 +0.8	usable	8 Ω vs 4 Ω: amp load changes · 800 W vs 1200 W: lower power handling	+
Hifonics MXZ 12D2	31 -7.7	0.443 -0.05	30 +16.4	10.3 +3.2	87.3 =	usable	8 Ω vs 4 Ω: amp load changes	+
Monacor RAPTOR 12 MK2	34 -4.7	0.523 +0.03	32 +18.4	10.1 +3	89.2 +1.9	usable		+

Compare the closest 3 against the T2D212 →

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.