Infinity REFERENCE 1200S

12" · 4 Ω · 250 W · 84.4 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	22.8 Hz
Qts	0.54
Qes	0.64
Qms	3.6
Vas	97.56 L
Sd	503 cm²
Xmax	7.6 mm
Re	4.2 Ω
Bl	12.9 T·m
Mms	177 g
Pe	250 W
Sensitivity	84.4 dB

Alignment hint

EBP	36 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 136.5 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

Driver	Fs (Hz)	Qts	Vas (L)	Xmax (mm)	Sens (dB)	Fit	Notes	Compare
Rockford Fosgate P1S2-12	25 +2.2	0.55 +0.01	88.3 -9.26	9 +1.4	85.1 +0.7	close	2 Ω vs 4 Ω: amp load changes	+
Rockford Fosgate P1S4-12	25 +2.2	0.55 +0.01	88.3 -9.26	9 +1.4	85.1 +0.7	close		+
Dayton Audio RSS315HFA-8 v2016	22.2 -0.6	0.444 -0.1	97.2 -0.36	11 +3.4	85.8 +1.4	close	8 Ω vs 4 Ω: amp load changes	+
Sony XS-L121P5S	22.6 -0.2	0.51 -0.03	102.1 +4.54	11.5 +3.9	89 +4.6	close		+
Dayton Audio RSS315HFA-8	25 +2.2	0.526 -0.01	75 -22.56	9.9 +2.3	85.5 +1.1	usable	8 Ω vs 4 Ω: amp load changes	+
JL Audio 12W1V2-8	24.98 +2.18	0.458 -0.08	100.15 +2.59	9.5 +1.9	86.8 +2.4	usable	8 Ω vs 4 Ω: amp load changes	+
Infinity KAPPA PERFECT 12.1	23.32 +0.52	0.44 -0.1	99.97 +2.41	14.15 +6.55	86.2 +1.8	usable		+
Focal AUDITOR RSB-300	25 +2.2	0.466 -0.07	93 -4.56	10.2 +2.6	87.4 +3	usable	8 Ω vs 4 Ω: amp load changes	+
Rockford Fosgate P1S412	25 +2.2	0.537 =	109 +11.44	9 +1.4	90.4 +6	usable		+
Rockford Fosgate P1S8-12	26 +3.2	0.593 +0.05	109 +11.44	9 +1.4	87.4 +3	usable	8 Ω vs 4 Ω: amp load changes	+

Compare the closest 3 against the REFERENCE 1200S →

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.