Altec 420A
Thiele-Small parameters
| Nominal size | 15" |
|---|---|
| Impedance | 8 Ω |
| Fs | 22.6 Hz |
| Qts | 0.473 |
| Qes | 0.51 |
| Qms | 6.59 |
| Vas | 798.5 L |
| Sd | 825.8 cm² |
| Xmax | 2.8 mm |
| Re | 4.6 Ω |
| Bl | 8.7 T·m |
| Mms | 59.4 g |
| Pe | 25 W |
| Sensitivity | 97 dB |
Alignment hint
| EBP | 44 · sealed |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 646.6 L |
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 |
|---|---|---|---|---|---|---|---|---|
| Altec 415C | 24.6 +2 | 0.526 +0.05 | 749.2 -49.3 | 3 +0.2 | 97.4 +0.4 | close | + | |
| EMS B15EX-05.0V | 22 -0.6 | 0.374 -0.1 | 791 -7.5 | 7 +4.2 | 96.1 -0.9 | usable | + | |
| Altec 416-8 Heathkit | 26.9 +4.3 | 0.466 -0.01 | 498 -300.5 | 3.8 +1 | 94.6 -2.4 | usable | + | |
| Altec 420A vp Daniel 1 | 23.6 +1 | 0.555 +0.08 | 509.1 -289.4 | 2.8 = | 94 -3 | usable | + | |
| Europsonic TS38/300 | 30 +7.4 | 0.553 +0.08 | 608.5 -190 | 4.5 +1.7 | 97.5 +0.5 | usable | + | |
| Great Plains Audio 416-8B v2016 | 21.5 -1.1 | 0.271 -0.2 | 787 -11.5 | 4 +1.2 | 97.2 +0.2 | usable | + | |
| Supravox 400-2000 vp1 | 21 -1.6 | 0.283 -0.19 | 780 -18.5 | 5 +2.2 | 96.8 -0.2 | usable | + | |
| Focal AUDIOM 15AX | 22.8 +0.2 | 0.311 -0.16 | 635 -163.5 | 6 +3.2 | 96.9 -0.1 | usable | + | |
| AE Speakers TD15S-4 Ohms | 22.8 +0.2 | 0.371 -0.1 | 467 -331.5 | 7 +4.2 | 96.9 -0.1 | usable | 4 Ω vs 8 Ω: amp load changes | + |
| AE Speakers TD15S-4ohm | 22.8 +0.2 | 0.371 -0.1 | 467 -331.5 | 7 +4.2 | 96.9 -0.1 | usable | 4 Ω vs 8 Ω: amp load changes | + |
Compare the closest 3 against the 420A →
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.