Pioneer TS-W309D4

12" · 8 Ω · 400 W · 86.4 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	37.2 Hz
Qts	0.811
Qes	0.87
Qms	11.86
Vas	33.8 L
Sd	518.8 cm²
Xmax	5.7 mm
Re	5.8 Ω
Bl	17.8 T·m
Mms	204.4 g
Pe	400 W
Sensitivity	86.4 dB

Alignment hint

EBP	43 · sealed
Sealed Vb (Qtc ≈ 0.71)	Qts too high

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
Pioneer TS-W310D4	37 -0.2	0.778 -0.03	37.4 +3.6	6.2 +0.5	87 +0.6	close		+
Selenium 12SW13ADVC 4+4	37 -0.2	0.854 +0.04	47 +13.2	7 +1.3	86.2 -0.2	close		+
Pioneer TS-W311S4	42 +4.8	0.795 -0.02	37.5 +3.7	5.8 +0.1	91.4 +5	usable	4 Ω vs 8 Ω: amp load changes	+
Ground Zero GZIW 12XSPL-D2	32.5 -4.7	0.736 -0.08	40.4 +6.6	7.6 +1.9	87.1 +0.7	usable		+
Skar Audio EV-12 S2	43.1 +5.9	0.7 -0.11	36.7 +2.9	8.5 +2.8	87.6 +1.2	usable	2 Ω vs 8 Ω: amp load changes · 200 W vs 400 W: lower power handling	+
Skar Audio EV-12 S4	45.7 +8.5	0.71 -0.1	34.8 +1	8.5 +2.8	88 +1.6	usable	4 Ω vs 8 Ω: amp load changes · 200 W vs 400 W: lower power handling	+
Focal 33KX	39 +1.8	0.733 -0.08	25 -8.8	5 -0.7	87.2 +0.8	usable	Xmax 5 mm < 5.7 mm: lower excursion-limited SPL	+
Fountek FW300	37.3 +0.1	0.783 -0.03	50.1 +16.3	5.5 -0.2	89.8 +3.4	usable	4 Ω vs 8 Ω: amp load changes · 300 W vs 400 W: lower power handling · Xmax 5.5 mm < 5.7 mm: lower excursion-limited SPL	+
Pioneer TS-W308D4	34.5 -2.7	0.625 -0.19	34.7 +0.9	6.4 +0.7	89.4 +3	usable	4 Ω vs 8 Ω: amp load changes	+
Pioneer TS-W310S4	35 -2.2	0.634 -0.18	35.4 +1.6	6.3 +0.6	89.9 +3.5	usable	4 Ω vs 8 Ω: amp load changes	+

Compare the closest 3 against the TS-W309D4 →

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.