JBL P1200

12" · 8 Ω · 250 W · 92.8 dB

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	30 Hz
Qts	0.45
Qes	0.49
Qms	5.5
Vas	123 L
Sd	551 cm²
Xmax	7.8 mm
Re	4.5 Ω
Bl	13 T·m
Mms	97.4 g
Pe	250 W
Sensitivity	92.8 dB

Alignment hint

EBP	61 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 83.7 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
JBL GT2-12	29.5 -0.5	0.42 -0.03	114.9 -8.1	8 +0.2	94.1 +1.3	close	4 Ω vs 8 Ω: amp load changes	+
Beyma 12"BR70	31 +1	0.5 +0.05	142 +19	8 +0.2	93 +0.2	close	125 W vs 250 W: lower power handling	+
Faital PRO 12FE330	33 +3	0.45 =	146.7 +23.7	8.32 +0.52	94 +1.2	close		+
MTX Audio T4124A	29.3 -0.7	0.549 +0.1	118.8 -4.2	8.4 +0.6	92.9 +0.1	close	4 Ω vs 8 Ω: amp load changes	+
Focal 33S	25.9 -4.1	0.464 +0.01	107.9 -15.1	7.5 -0.3	92.8 =	close	4 Ω vs 8 Ω: amp load changes · Xmax 7.5 mm < 7.8 mm: lower excursion-limited SPL	+
Focal 33V	25.2 -4.8	0.479 +0.03	128.8 +5.8	7.5 -0.3	93 +0.2	close	4 Ω vs 8 Ω: amp load changes · Xmax 7.5 mm < 7.8 mm: lower excursion-limited SPL	+
Dayton Audio ST305-8	29.6 -0.4	0.348 -0.1	128.1 +5.1	8 +0.2	92.9 +0.1	close		+
Infinity 120W.IB	32 +2	0.527 +0.08	127 +4	8.1 +0.3	94.9 +2.1	close	4 Ω vs 8 Ω: amp load changes	+
HiVi D10G	26 -4	0.465 +0.02	117.3 -5.7	8.3 +0.5	89 -3.8	close	150 W vs 250 W: lower power handling	+
GRS 12PT-8	35 +5	0.387 -0.06	112 -11	7.8 =	93 +0.2	usable		+

Compare the closest 3 against the P1200 →

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.