Infinity KAPPA 120.9W

12" · 8 Ω · 350 W · 87.9 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	27.2 Hz
Qts	0.43
Qes	0.52
Qms	2.47
Vas	54.4 L
Sd	518.8 cm²
Xmax	6.7 mm
Re	4.3 Ω
Bl	18.3 T·m
Mms	237.3 g
Pe	350 W
Sensitivity	87.9 dB

Alignment hint

EBP	52 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 31.9 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
Sony XS-L121P5	26.4 -0.8	0.42 -0.01	55.5 +1.1	7.5 +0.8	85.5 -2.4	close	4 Ω vs 8 Ω: amp load changes	+
Monacor SONIC 12 vp	27 -0.2	0.469 +0.04	51 -3.4	6.3 -0.4	88.1 +0.2	close	Xmax 6.3 mm < 6.7 mm: lower excursion-limited SPL	+
Alpine SWR-12D2 vp	27 -0.2	0.441 +0.01	46 -8.4	10 +3.3	87.8 -0.1	close		+
Max Speaker MF300/77S4	26.4 -0.8	0.383 -0.05	53.1 -1.3	6.7 =	89 +1.1	close	4 Ω vs 8 Ω: amp load changes	+
Infinity 120.3SE	28.4 +1.2	0.475 +0.04	55.6 +1.2	6.8 +0.1	89.5 +1.6	close	4 Ω vs 8 Ω: amp load changes	+
Earthquake Sound SUBZERO-12	26.8 -0.4	0.424 -0.01	58.1 +3.7	12.7 +6	86.2 -1.7	close		+
Rockford Fosgate T0D212	25.3 -1.9	0.473 +0.04	55 +0.6	10.5 +3.8	88 +0.1	close	4 Ω vs 8 Ω: amp load changes	+
JBL GTO 1214	28 +0.8	0.469 +0.04	58.2 +3.8	7.3 +0.6	89.4 +1.5	close	4 Ω vs 8 Ω: amp load changes	+
Ground Zero GZRW 12XD-AL	29 +1.8	0.451 +0.02	52 -2.4	9.2 +2.5	86.1 -1.8	close		+
Pioneer TS-W126C(PREMIER)	32.6 +5.4	0.42 -0.01	55.614 +1.21	8.7 +2	88.4 +0.5	close	4 Ω vs 8 Ω: amp load changes	+

Compare the closest 3 against the KAPPA 120.9W →

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.