JBL P1222 vp

12" · 2 Ω · 400 W · 93.4 dB

Thiele-Small parameters

Nominal size	12"
Impedance	2 Ω
Fs	28.6 Hz
Qts	0.545
Qes	0.58
Qms	9.04
Vas	43.3 L
Sd	562 cm²
Xmax	6.9 mm
Re	1 Ω
Bl	9.9 T·m
Mms	316.7 g
Pe	400 W
Sensitivity	93.4 dB

Alignment hint

EBP	49 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 63.4 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
Alpine 1242D	29 +0.4	0.47 -0.08	45 +1.7	9.1 +2.2	91.4 -2	close	4 Ω vs 2 Ω: amp load changes	+
JBL P1220	28.7 +0.1	0.448 -0.1	47.4 +4.1	7.8 +0.9	91.8 -1.6	close		+
Pioneer TS-W307D4	34.8 +6.2	0.52 -0.03	40.9 -2.4	7.4 +0.5	91.3 -2.1	close	4 Ω vs 2 Ω: amp load changes	+
Dayton Audio TITANIC	36.3 +7.7	0.506 -0.04	44 +0.7	7.4 +0.5	92 -1.4	close	4 Ω vs 2 Ω: amp load changes	+
JBL W12GTI	31.8 +3.2	0.508 -0.04	44.8 +1.5	9.9 +3	90.1 -3.3	usable	4 Ω vs 2 Ω: amp load changes	+
JBL W12GTi MKII	31.8 +3.2	0.508 -0.04	44.8 +1.5	9.9 +3	90.1 -3.3	usable	4 Ω vs 2 Ω: amp load changes	+
JBL W12GTIe	31.8 +3.2	0.508 -0.04	44.8 +1.5	9.9 +3	90.1 -3.3	usable	4 Ω vs 2 Ω: amp load changes	+
Massive Audio REBEL 124	32.6 +4	0.485 -0.06	38 -5.3	7.1 +0.2	92.4 -1	usable		+
Kenwood W1024DB	33 +4.4	0.567 +0.02	51.3 +8	6.9 =	91 -2.4	usable	4 Ω vs 2 Ω: amp load changes · 300 W vs 400 W: lower power handling	+
Powerbass L-124D 12	29 +0.4	0.489 -0.06	59 +15.7	9 +2.1	93.2 -0.2	usable		+

Compare the closest 3 against the P1222 vp →

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.