Rockford Fosgate T112D2

12" · 4 Ω · 600 W · 89 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	31 Hz
Qts	0.474
Qes	0.53
Qms	4.46
Vas	34.8 L
Sd	460 cm²
Xmax	8.2 mm
Re	3.1 Ω
Bl	16 T·m
Mms	224.7 g
Pe	600 W
Sensitivity	89 dB

Alignment hint

EBP	58 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 28.4 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
Dayton Audio RSS315HE-22	32 +1	0.461 -0.01	32.4 -2.4	8.2 =	88.1 -0.9	close	8 Ω vs 4 Ω: amp load changes	+
Hifonics MXZ 12D2	31 =	0.443 -0.03	30 -4.8	10.3 +2.1	87.3 -1.7	close	8 Ω vs 4 Ω: amp load changes	+
Monacor RAPTOR 12 MK2	34 +3	0.523 +0.05	32 -2.8	10.1 +1.9	89.2 +0.2	close		+
Dayton Audio RSS315HO-4	31.6 +0.6	0.407 -0.07	33.5 -1.3	7.2 -1	89.4 +0.4	close	Xmax 7.2 mm < 8.2 mm: lower excursion-limited SPL	+
JBL W12GTI	31.8 +0.8	0.508 +0.03	44.8 +10	9.9 +1.7	90.1 +1.1	close		+
JBL W12GTi MKII	31.8 +0.8	0.508 +0.03	44.8 +10	9.9 +1.7	90.1 +1.1	close		+
JBL W12GTIe	31.8 +0.8	0.508 +0.03	44.8 +10	9.9 +1.7	90.1 +1.1	close		+
Massive Audio REBEL 124	32.6 +1.6	0.485 +0.01	38 +3.2	7.1 -1.1	92.4 +3.4	close	2 Ω vs 4 Ω: amp load changes · Xmax 7.1 mm < 8.2 mm: lower excursion-limited SPL	+
Pioneer TS-W306DVC	32.9 +1.9	0.478 =	51.8 +17	8.3 +0.1	88.9 -0.1	close	8 Ω vs 4 Ω: amp load changes · 400 W vs 600 W: lower power handling	+
JL Audio 12TW1-4	32.35 +1.35	0.529 +0.06	33.67 -1.13	10 +1.8	85.15 -3.85	close	300 W vs 600 W: lower power handling	+

Compare the closest 3 against the T112D2 →

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.