Altec 4156-8A
Thiele-Small parameters
| Nominal size | 15" |
|---|---|
| Impedance | 8 Ω |
| Fs | 29 Hz |
| Qts | 0.28 |
| Qes | 0.31 |
| Qms | 2.91 |
| Vas | 353.7 L |
| Sd | 850 cm² |
| Xmax | 4.3 mm |
| Re | 5.6 Ω |
| Bl | 16.8 T·m |
| Mms | 86.2 g |
| Pe | 250 W |
| Sensitivity | 98 dB |
Alignment hint
| EBP | 94 · flexible |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 65.8 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 |
|---|---|---|---|---|---|---|---|---|
| Monacor SP-385PAX | 30 +1 | 0.285 = | 365 +11.3 | 4.5 +0.2 | 98 = | close | 175 W vs 250 W: lower power handling | + |
| Davis 40RCA15 | 27 -2 | 0.282 = | 350 -3.7 | 5 +0.7 | 97.7 -0.3 | close | + | |
| Davis 40RCA15DF | 27 -2 | 0.282 = | 350 -3.7 | 5 +0.7 | 97.7 -0.3 | close | + | |
| Davis 40RCADF | 27 -2 | 0.282 = | 350 -3.7 | 5 +0.7 | 97.7 -0.3 | close | + | |
| Kenwood TRIO | 27 -2 | 0.27 -0.01 | 350 -3.7 | 5 +0.7 | 97.4 -0.6 | close | + | |
| Usher Audio 15HM Studio | 27 -2 | 0.28 = | 385 +31.3 | 5.9 +1.6 | 98 = | close | 150 W vs 250 W: lower power handling | + |
| Focal AUDIOM 15B | 31.6 +2.6 | 0.282 = | 330 -23.7 | 6 +1.7 | 98.8 +0.8 | close | + | |
| Usher Audio 15 HM | 28.7 -0.3 | 0.299 +0.02 | 314.9 -38.8 | 5.5 +1.2 | 97.6 -0.4 | close | 150 W vs 250 W: lower power handling | + |
| Davis 39RPA15 | 31 +2 | 0.27 -0.01 | 340 -13.7 | 4 -0.3 | 99.3 +1.3 | close | Xmax 4 mm < 4.3 mm: lower excursion-limited SPL | + |
| Davis 38RCA15 | 29 = | 0.24 -0.04 | 373 +19.3 | 5 +0.7 | 98.2 +0.2 | close | + |
Compare the closest 3 against the 4156-8A →
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.