Pioneer TS-W303R

12" · 4 Ω · 250 W · 87.8 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	24.1 Hz
Qts	0.637
Qes	0.76
Qms	3.94
Vas	86.3 L
Sd	471 cm²
Xmax	5 mm
Re	3.3 Ω
Bl	10.2 T·m
Mms	157.2 g
Pe	250 W
Sensitivity	87.8 dB

Alignment hint

EBP	32 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 371.6 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
Focal 30A4	24.7 +0.6	0.671 +0.03	86.9 +0.6	8.5 +3.5	87.3 -0.5	close	8 Ω vs 4 Ω: amp load changes	+
Focal 30A4 vp	24.7 +0.6	0.671 +0.03	86.9 +0.6	8.5 +3.5	87.3 -0.5	close	8 Ω vs 4 Ω: amp load changes	+
Pyle Audio PLD12WD vp	25 +0.9	0.674 +0.04	77.3 -9	8 +3	86.3 -1.5	close	8 Ω vs 4 Ω: amp load changes	+
Peerless XXLS-P830845 v2025	29 +4.9	0.654 +0.02	91.9 +5.6	7.6 +2.6	88.5 +0.7	close	8 Ω vs 4 Ω: amp load changes · 175 W vs 250 W: lower power handling	+
Dayton Audio UM12-22	24.9 +0.8	0.589 -0.05	71.6 -14.7	12.5 +7.5	87.7 -0.1	usable		+
Rockford Fosgate P1S2-12	25 +0.9	0.55 -0.09	88.3 +2	9 +4	85.1 -2.7	usable	2 Ω vs 4 Ω: amp load changes	+
Rockford Fosgate P1S4-12	25 +0.9	0.55 -0.09	88.3 +2	9 +4	85.1 -2.7	usable		+
Monacor CRB-12TC vp série	31 +6.9	0.611 -0.03	75 -11.3	4.9 -0.1	87.3 -0.5	usable	8 Ω vs 4 Ω: amp load changes · 100 W vs 250 W: lower power handling · Xmax 4.9 mm < 5 mm: lower excursion-limited SPL	+
Kenwood KFC-W3013	25 +0.9	0.82 +0.18	83.7 -2.6	7.6 +2.6	87.3 -0.5	usable		+
Rockford Fosgate P1S8-12	26 +1.9	0.593 -0.04	109 +22.7	9 +4	87.4 -0.4	usable	8 Ω vs 4 Ω: amp load changes	+

Compare the closest 3 against the TS-W303R →

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.