Infinity PRIMUS 1270

12" · 4 Ω · 300 W · 87.3 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	29.7 Hz
Qts	0.49
Qes	0.56
Qms	3.9
Vas	75.7 L
Sd	530 cm²
Xmax	11.3 mm
Re	3.6 Ω
Bl	13.4 T·m
Mms	149.5 g
Pe	300 W
Sensitivity	87.3 dB

Alignment hint

EBP	53 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 69.9 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 +0.3	0.49 =	67.79 -7.91	10 -1.3	87.2 -0.1	close	Xmax 10 mm < 11.3 mm: lower excursion-limited SPL	+
Audio System HX12 SQ	28.2 -1.5	0.5 +0.01	68 -7.7	11.8 +0.5	86.1 -1.2	close		+
JL Audio 12W1V3-4	26.21 -3.49	0.5 +0.01	76.63 +0.93	11 -0.3	86.1 -1.2	close	Xmax 11 mm < 11.3 mm: lower excursion-limited SPL	+
Sound Storm Labs CR12D	30.7 +1	0.522 +0.03	66.9 -8.8	10.3 -1	87.5 +0.2	close	8 Ω vs 4 Ω: amp load changes · Xmax 10.3 mm < 11.3 mm: lower excursion-limited SPL	+
Rockford Fosgate S2-124	27 -2.7	0.498 +0.01	77 +1.3	10.7 -0.6	89.9 +2.6	close	Xmax 10.7 mm < 11.3 mm: lower excursion-limited SPL	+
Powerbass S-1204D	31 +1.3	0.5 +0.01	65 -10.7	9.5 -1.8	87.2 -0.1	close	Xmax 9.5 mm < 11.3 mm: lower excursion-limited SPL	+
JL Audio 12W1V3-2	26.55 -3.15	0.52 +0.03	72 -3.7	11 -0.3	85.9 -1.4	close	2 Ω vs 4 Ω: amp load changes · Xmax 11 mm < 11.3 mm: lower excursion-limited SPL	+
Infinity REFERENCE 1240W	25.4 -4.3	0.47 -0.02	84.4 +8.7	11.5 +0.2	86.3 -1	close		+
Infinity REFERENCE 1250W	25.4 -4.3	0.47 -0.02	84.4 +8.7	11.5 +0.2	86.3 -1	close		+
JL Audio 12W6V2-D4	25 -4.7	0.45 -0.04	79.9 +4.2	12.7 +1.4	86.9 -0.4	close	8 Ω vs 4 Ω: amp load changes	+

Compare the closest 3 against the PRIMUS 1270 →

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.