Focal 33S

12" · 4 Ω · 300 W · 92.8 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	25.9 Hz
Qts	0.464
Qes	0.48
Qms	14.3
Vas	107.9 L
Sd	530.9 cm²
Xmax	7.5 mm
Re	2.6 Ω
Bl	11 T·m
Mms	138.3 g
Pe	300 W
Sensitivity	92.8 dB

Alignment hint

EBP	54 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 81.6 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
Focal 33V	25.2 -0.7	0.479 +0.01	128.8 +20.9	7.5 =	93 +0.2	close		+
HiVi D10G	26 +0.1	0.465 =	117.3 +9.4	8.3 +0.8	89 -3.8	close	8 Ω vs 4 Ω: amp load changes · 150 W vs 300 W: lower power handling	+
Ground Zero GZTW 30	25 -0.9	0.44 -0.02	110 +2.1	11.2 +3.7	90.7 -2.1	close		+
Ground Zero GZTW 30T	25 -0.9	0.443 -0.02	110 +2.1	11.9 +4.4	90.7 -2.1	close		+
Cerwin-Vega HED-12 2	26 +0.1	0.501 +0.04	109 +1.1	6 -1.5	93.6 +0.8	close	2 Ω vs 4 Ω: amp load changes · Xmax 6 mm < 7.5 mm: lower excursion-limited SPL	+
JBL P1200	30 +4.1	0.45 -0.01	123 +15.1	7.8 +0.3	92.8 =	close	8 Ω vs 4 Ω: amp load changes	+
Rythmik Audio DS1200	26 +0.1	0.444 -0.02	88 -19.9	8.8 +1.3	91.7 -1.1	close		+
Rockford Fosgate P112S4	25 -0.9	0.52 +0.06	110 +2.1	7.3 -0.2	90.6 -2.2	close	150 W vs 300 W: lower power handling · Xmax 7.3 mm < 7.5 mm: lower excursion-limited SPL	+
Nakamichi SP-W30S	27.8 +1.9	0.464 =	92.3 -15.6	6.6 -0.9	91.3 -1.5	close	200 W vs 300 W: lower power handling · Xmax 6.6 mm < 7.5 mm: lower excursion-limited SPL	+
Rockford Fosgate P1S412	25 -0.9	0.537 +0.07	109 +1.1	9 +1.5	90.4 -2.4	close		+

Compare the closest 3 against the 33S →

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.