Focal W31B
Thiele-Small parameters
| Nominal size | 12" |
|---|---|
| Impedance | 8 Ω |
| Fs | 40 Hz |
| Qts | 0.58 |
| Qes | 0.659 |
| Qms | 4.84 |
| Vas | 125 L |
| Sd | 518.8 cm² |
| Xmax | 6 mm |
| Re | 4 Ω |
| Bl | 8.5 T·m |
| Mms | 47.8 g |
| Pe | 250 W |
| Sensitivity | 95.8 dB |
Alignment hint
| EBP | 61 · 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
| Driver | Fs (Hz) | Qts | Vas (L) | Xmax (mm) | Sens (dB) | Fit | Notes | Compare |
|---|---|---|---|---|---|---|---|---|
| JL Audio 12IB4 | 40.5 +0.5 | 0.631 +0.05 | 112.4 -12.6 | 6 = | 93.6 -2.2 | close | 125 W vs 250 W: lower power handling | + |
| AE Speakers LO12-D8 v2016 | 41.9 +1.9 | 0.67 +0.09 | 117.9 -7.1 | 7.4 +1.4 | 97.1 +1.3 | close | 4 Ω vs 8 Ω: amp load changes | + |
| AE Speakers LO12-D16 | 41.9 +1.9 | 0.67 +0.09 | 119.7 -5.3 | 7.4 +1.4 | 94.1 -1.7 | close | + | |
| Eminence LTD-12MK2 | 37.9 -2.1 | 0.485 -0.09 | 123.2 -1.8 | 5.6 -0.4 | 98 +2.2 | usable | 4 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-W302F | 33.4 -6.6 | 0.6 +0.02 | 105.6 -19.4 | 6 = | 94.3 -1.5 | usable | 4 Ω vs 8 Ω: amp load changes · 150 W vs 250 W: lower power handling | + |
| Audax LFP501 | 40 = | 0.521 -0.06 | 138 +13 | 4.5 -1.5 | 94.6 -1.2 | usable | 150 W vs 250 W: lower power handling · Xmax 4.5 mm < 6 mm: lower excursion-limited SPL | + |
| Audax PR30ST100 | 40 = | 0.521 -0.06 | 138 +13 | 4.5 -1.5 | 94.6 -1.2 | usable | 100 W vs 250 W: lower power handling · Xmax 4.5 mm < 6 mm: lower excursion-limited SPL | + |
| Infinity 120W.IB | 32 -8 | 0.527 -0.05 | 127 +2 | 8.1 +2.1 | 94.9 -0.9 | usable | 4 Ω vs 8 Ω: amp load changes | + |
| Pioneer TS-A2503i vp | 41 +1 | 0.579 = | 162 +37 | 5 -1 | 98.2 +2.4 | usable | 4 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-120B150 | 44 +4 | 0.623 +0.04 | 103.8 -21.2 | 6.8 +0.8 | 93.5 -2.3 | usable | + |
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.