Pioneer TS-W311S4

12" · 4 Ω · 400 W · 91.4 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	42 Hz
Qts	0.795
Qes	0.84
Qms	14.96
Vas	37.5 L
Sd	520 cm²
Xmax	5.8 mm
Re	3 Ω
Bl	11.7 T·m
Mms	145.1 g
Pe	400 W
Sensitivity	91.4 dB

Alignment hint

EBP	50 · flexible
Sealed Vb (Qtc ≈ 0.71)	Qts too high

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
Pioneer TS-W310D4	37 -5	0.778 -0.02	37.4 -0.1	6.2 +0.4	87 -4.4	close	8 Ω vs 4 Ω: amp load changes	+
MTX Audio T8500	35.5 -6.5	0.734 -0.06	41.5 +4	5.4 -0.4	92.2 +0.8	usable	2 Ω vs 4 Ω: amp load changes · Xmax 5.4 mm < 5.8 mm: lower excursion-limited SPL	+
Skar Audio EV-12 S2	43.1 +1.1	0.7 -0.1	36.7 -0.8	8.5 +2.7	87.6 -3.8	usable	2 Ω vs 4 Ω: amp load changes · 200 W vs 400 W: lower power handling	+
Pioneer TS-W309D4	37.2 -4.8	0.811 +0.02	33.8 -3.7	5.7 -0.1	86.4 -5	usable	8 Ω vs 4 Ω: amp load changes · Xmax 5.7 mm < 5.8 mm: lower excursion-limited SPL	+
Fountek FW300	37.3 -4.7	0.783 -0.01	50.1 +12.6	5.5 -0.3	89.8 -1.6	usable	300 W vs 400 W: lower power handling · Xmax 5.5 mm < 5.8 mm: lower excursion-limited SPL	+
Pioneer TS-W311D4	43 +1	0.95 +0.15	32.7 -4.8	4.8 -1	92.1 +0.7	usable	Xmax 4.8 mm < 5.8 mm: lower excursion-limited SPL	+
Skar Audio EV-12 S4	45.7 +3.7	0.71 -0.09	34.8 -2.7	8.5 +2.7	88 -3.4	usable	200 W vs 400 W: lower power handling	+
Pioneer TS-W310S4	35 -7	0.634 -0.16	35.4 -2.1	6.3 +0.5	89.9 -1.5	usable		+
Pioneer TS-A30S4	39.2 -2.8	0.7 -0.1	56.1 +18.6	6.6 +0.8	92.1 +0.7	usable		+
Selenium 12SW3A DVC 2+2	35 -7	0.724 -0.07	49 +11.5	6.5 +0.7	89.6 -1.8	usable		+

Compare the closest 3 against the TS-W311S4 →

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.