Focal R-300S

12" · 4 Ω · 300 W · 89.6 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	32.6 Hz
Qts	0.582
Qes	0.663
Qms	4.731
Vas	53.9 L
Sd	471.4 cm²
Xmax	6 mm
Re	3.89 Ω
Bl	12.9 T·m
Mms	137.7 g
Pe	300 W
Sensitivity	89.6 dB

Alignment hint

EBP	49 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 113.2 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
Kenwood W1024DB	33 +0.4	0.567 -0.02	51.3 -2.6	6.9 +0.9	91 +1.4	close		+
JBL S2-1224	32.4 -0.2	0.581 =	59.7 +5.8	5.3 -0.7	89.1 -0.5	close	8 Ω vs 4 Ω: amp load changes · Xmax 5.3 mm < 6 mm: lower excursion-limited SPL	+
JBL GT5-12 vp	29 -3.6	0.582 =	54.2 +0.3	6.7 +0.7	88.1 -1.5	close	8 Ω vs 4 Ω: amp load changes	+
MTX Audio RTS12-04	33.5 +0.9	0.631 +0.05	58.4 +4.5	5.8 -0.2	89.5 -0.1	close	Xmax 5.8 mm < 6 mm: lower excursion-limited SPL	+
Dayton Audio UMII12-22	31 -1.6	0.564 -0.02	53 -0.9	10 +4	88.2 -1.4	close	8 Ω vs 4 Ω: amp load changes	+
Scan-Speak 30W/4552-01	34 +1.4	0.525 -0.06	52.9 -1	6.6 +0.6	90.7 +1.1	close		+
Peerless SBS-300F38CP01-04	36 +3.4	0.611 +0.03	55.8 +1.9	5.9 -0.1	90.9 +1.3	close	Xmax 5.9 mm < 6 mm: lower excursion-limited SPL	+
Sony XS-L124P5B	33.1 +0.5	0.626 +0.04	44.5 -9.4	6 =	88.8 -0.8	close		+
JBL STAGE 1210	31.7 -0.9	0.55 -0.03	64.6 +10.7	6.6 +0.6	90.8 +1.2	close		+
Alpine SWS-1241	30 -2.6	0.563 -0.02	65 +11.1	6.7 +0.7	90.1 +0.5	close	200 W vs 300 W: lower power handling	+

Compare the closest 3 against the R-300S →

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.