Focal 40A

15" · 4 Ω · 400 W · 94.5 dB · datasheet ↗

Thiele-Small parameters

Nominal size	15"
Impedance	4 Ω
Fs	41.3 Hz
Qts	0.633
Qes	0.72
Qms	5.22
Vas	74.6 L
Sd	881.4 cm²
Xmax	4.7 mm
Re	3.3 Ω
Bl	16.1 T·m
Mms	216.7 g
Pe	400 W
Sensitivity	94.5 dB

Alignment hint

EBP	57 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 301 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
B&C 15BG76	44 +2.7	0.56 -0.07	68.4 -6.2	9.6 +4.9	93.4 -1.1	usable	8 Ω vs 4 Ω: amp load changes	+
MTX Audio TH9515.44	31.9 -9.4	0.653 +0.02	70 -4.6	6.3 +1.6	93.3 -1.2	usable	2 Ω vs 4 Ω: amp load changes	+
Gladen SQX15	35.5 -5.8	0.513 -0.12	80.7 +6.1	7 +2.3	94.3 -0.2	usable		+
Monacor RAPTOR 15	39 -2.3	0.696 +0.06	56 -18.6	7.4 +2.7	92 -2.5	usable		+
Monacor RAPTOR 15 MK2	39 -2.3	0.696 +0.06	56 -18.6	7.4 +2.7	92 -2.5	usable		+
the box Speaker 15-300/8-A	52.6 +11.3	0.64 +0.01	100.3 +25.7	4.6 -0.1	96.8 +2.3	usable	8 Ω vs 4 Ω: amp load changes · 300 W vs 400 W: lower power handling · Xmax 4.6 mm < 4.7 mm: lower excursion-limited SPL	+
DD Audio 615 D2	32.3 -9	0.689 +0.06	81.6 +7	5 +0.3	90.5 -4	usable	8 Ω vs 4 Ω: amp load changes · 300 W vs 400 W: lower power handling	+
hertz Hertz Audio SX380D	43 +1.7	0.651 +0.02	45 -29.6	6.1 +1.4	92.1 -2.4	usable	8 Ω vs 4 Ω: amp load changes	+
Bose 38 CM CAR AUDIO vp	46 +4.7	0.526 -0.11	108.8 +34.2	4.5 -0.2	94.6 +0.1	usable	8 Ω vs 4 Ω: amp load changes · 250 W vs 400 W: lower power handling · Xmax 4.5 mm < 4.7 mm: lower excursion-limited SPL	+
JBL 15WT3000	41 -0.3	0.44 -0.19	76.3 +1.7	10.6 +5.9	92.5 -2	usable		+

Compare the closest 3 against the 40A →

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.