PHL Audio 4021 vp kaz1
Thiele-Small parameters
| Nominal size | 12" |
|---|---|
| Impedance | 8 Ω |
| Fs | 40.4 Hz |
| Qts | 0.354 |
| Qes | 0.38 |
| Qms | 5.18 |
| Vas | 46.3 L |
| Sd | 530.9 cm² |
| Xmax | 5.5 mm |
| Re | 5.3 Ω |
| Bl | 21.7 T·m |
| Mms | 132.6 g |
| Pe | 450 W |
| Sensitivity | 92.8 dB |
Alignment hint
| EBP | 106 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 15.5 L |
EBP > 100: favours a ported (bass-reflex) 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-W1200PRO | 40 -0.4 | 0.376 +0.02 | 45.6 -0.7 | 5.8 +0.3 | 91.3 -1.5 | close | + | |
| Faital PRO 12RS550 | 42 +1.6 | 0.37 +0.02 | 45.4 -0.9 | 9.25 +3.75 | 93 +0.2 | close | + | |
| B&C 12 BG 100 | 39 -1.4 | 0.333 -0.02 | 41 -5.3 | 7.8 +2.3 | 92.4 -0.4 | close | + | |
| B&C 12BG100 | 39 -1.4 | 0.33 -0.02 | 41 -5.3 | 10.5 +5 | 93 +0.2 | close | + | |
| PD PDN 12SB40 | 47.2 +6.8 | 0.382 +0.03 | 45.1 -1.2 | 6 +0.5 | 94.2 +1.4 | close | + | |
| Precision Devices PDN 12SB40 | 47.2 +6.8 | 0.382 +0.03 | 45.1 -1.2 | 6 +0.5 | 94.2 +1.4 | close | + | |
| Beyma POWER 12 vp | 42.7 +2.3 | 0.358 = | 53.1 +6.8 | 5.9 +0.4 | 96.2 +3.4 | close | 4 Ω vs 8 Ω: amp load changes | + |
| Radian 2312-8 | 46.7 +6.3 | 0.36 +0.01 | 51.3 +5 | 4.9 -0.6 | 93.6 +0.8 | close | Xmax 4.9 mm < 5.5 mm: lower excursion-limited SPL | + |
| Focal 33K | 38.4 -2 | 0.415 +0.06 | 51.1 +4.8 | 5.9 +0.4 | 93.5 +0.7 | close | 4 Ω vs 8 Ω: amp load changes | + |
| Eminence DEFINIMAX 4012ULF-8 | 40 -0.4 | 0.31 -0.04 | 41.342 -4.96 | 6.7 +1.2 | 91 -1.8 | close | + |
Compare the closest 3 against the 4021 vp kaz1 →
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.