Focal 33 K
Thiele-Small parameters
| Nominal size | 13" |
|---|---|
| Impedance | 4 Ω |
| Fs | 38.4 Hz |
| Qts | 0.41 |
| Qes | 0.44 |
| Qms | 7.2 |
| Vas | 51.8 L |
| Sd | 549 cm² |
| Xmax | 9 mm |
| Re | 3.7 Ω |
| Bl | 17 T·m |
| Mms | 141.5 g |
| Pe | 400 W |
| Sensitivity | 90.1 dB |
Alignment hint
| EBP | 87 · flexible |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 26.2 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 |
|---|---|---|---|---|---|---|---|---|
| Soundstream STEALTH-13 | 30.2 -8.2 | 0.85 +0.44 | 42.17 -9.63 | 6 -3 | 80.7 -9.4 | risky | 200 W vs 400 W: lower power handling · Xmax 6 mm < 9 mm: lower excursion-limited SPL | + |
| HiVi D5.8 | 52 +13.6 | 0.37 -0.04 | 5.6 -46.2 | 4.8 -4.2 | 84.6 -5.5 | risky | 8 Ω vs 4 Ω: amp load changes · 60 W vs 400 W: lower power handling · Xmax 4.8 mm < 9 mm: lower excursion-limited SPL | + |
Compare the closest 2 against the 33 K →
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.