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Focal W31B

12" · 8 Ω · 250 W · 95.8 dB · datasheet ↗

Thiele-Small parameters

Nominal size12"
Impedance8 Ω
Fs40 Hz
Qts0.58
Qes0.659
Qms4.84
Vas125 L
Sd518.8 cm²
Xmax6 mm
Re4 Ω
Bl8.5 T·m
Mms47.8 g
Pe250 W
Sensitivity95.8 dB

Alignment hint

EBP61 · flexible
Sealed Vb (Qtc ≈ 0.71)≈ 257 L

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

DriverFs (Hz)QtsVas (L)Xmax (mm)Sens (dB)FitNotesCompare
JL Audio 12IB440.5 +0.50.631 +0.05112.4 -12.66 =93.6 -2.2close125 W vs 250 W: lower power handling+
AE Speakers LO12-D8 v201641.9 +1.90.67 +0.09117.9 -7.17.4 +1.497.1 +1.3close4 Ω vs 8 Ω: amp load changes+
AE Speakers LO12-D1641.9 +1.90.67 +0.09119.7 -5.37.4 +1.494.1 -1.7close+
Eminence LTD-12MK237.9 -2.10.485 -0.09123.2 -1.85.6 -0.498 +2.2usable4 Ω vs 8 Ω: amp load changes · 150 W vs 250 W: lower power handling · Xmax 5.6 mm < 6 mm: lower excursion-limited SPL+
Pioneer TS-W302F33.4 -6.60.6 +0.02105.6 -19.46 =94.3 -1.5usable4 Ω vs 8 Ω: amp load changes · 150 W vs 250 W: lower power handling+
Audax LFP50140 =0.521 -0.06138 +134.5 -1.594.6 -1.2usable150 W vs 250 W: lower power handling · Xmax 4.5 mm < 6 mm: lower excursion-limited SPL+
Audax PR30ST10040 =0.521 -0.06138 +134.5 -1.594.6 -1.2usable100 W vs 250 W: lower power handling · Xmax 4.5 mm < 6 mm: lower excursion-limited SPL+
Infinity 120W.IB32 -80.527 -0.05127 +28.1 +2.194.9 -0.9usable4 Ω vs 8 Ω: amp load changes+
Pioneer TS-A2503i vp41 +10.579 =162 +375 -198.2 +2.4usable4 Ω vs 8 Ω: amp load changes · 80 W vs 250 W: lower power handling · Xmax 5 mm < 6 mm: lower excursion-limited SPL+
SB Audience BIANCO-120B15044 +40.623 +0.04103.8 -21.26.8 +0.893.5 -2.3usable+

Compare the closest 3 against the W31B →

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.