Focal 25 A4

10" · 8 Ω · 200 W · 85.4 dB · datasheet ↗

Thiele-Small parameters

Nominal size	10"
Impedance	8 Ω
Fs	23.5 Hz
Qts	0.506
Qes	0.562
Qms	5.059
Vas	49.9 L
Sd	330.1 cm²
Xmax	4.3 mm
Re	4.19 Ω
Bl	12.4 T·m
Mms	140.5 g
Pe	200 W
Sensitivity	85.4 dB

Alignment hint

EBP	42 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 52.4 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
Phase Linear ALIANTE 10 SI	22 -1.5	0.504 =	50.3 +0.4	5.8 +1.5	84.4 -1	close	100 W vs 200 W: lower power handling	+
Dayton Audio RSS265HF-8	24.9 +1.4	0.497 -0.01	51.6 +1.7	9.4 +5.1	84.3 -1.1	close		+
Dayton Audio RSS265HF-8 v2018	24.9 +1.4	0.485 -0.02	52.5 +2.6	9.4 +5.1	84.3 -1.1	close		+
SB Acoustics SW26DAC76-4	22 -1.5	0.467 -0.04	45.3 -4.6	9.6 +5.3	85.8 +0.4	close	4 Ω vs 8 Ω: amp load changes	+
Focal SUB10	21 -2.5	0.526 +0.02	45 -4.9	9 +4.7	84.5 -0.9	close	4 Ω vs 8 Ω: amp load changes	+
Hertz Audio ES 250	26.9 +3.4	0.54 +0.03	54 +4.1	9 +4.7	84.4 -1	usable	4 Ω vs 8 Ω: amp load changes	+
JL Audio 10W1V2-8	26.5 +3	0.438 -0.07	49.1009 -0.8	9.906 +5.61	84.7 -0.7	usable		+
Sony XS-L103P5B	26.6 +3.1	0.41 -0.1	52.5 +2.6	6.2 +1.9	85.5 +0.1	usable	4 Ω vs 8 Ω: amp load changes	+
JL Audio 10W1V2-4	25.2 +1.7	0.405 -0.1	50.4601 +0.56	9.906 +5.61	84.6 -0.8	usable	4 Ω vs 8 Ω: amp load changes	+
Dayton Audio RSS265HF-4 V2015	25.6 +2.1	0.452 -0.05	54 +4.1	9.4 +5.1	87.9 +2.5	usable	4 Ω vs 8 Ω: amp load changes	+

Compare the closest 3 against the 25 A4 →

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.