Altec 425-8H-II
Thiele-Small parameters
| Nominal size | 10" |
|---|---|
| Impedance | 8 Ω |
| Fs | 73.9 Hz |
| Qts | 0.234 |
| Qes | 0.26 |
| Qms | 2.3 |
| Vas | 25.8 L |
| Sd | 348.4 cm² |
| Xmax | 1.3 mm |
| Re | 5.5 Ω |
| Bl | 17.3 T·m |
| Mms | 30.6 g |
| Pe | 60 W |
| Sensitivity | 99.6 dB |
Alignment hint
| EBP | 284 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 3.2 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 |
|---|---|---|---|---|---|---|---|---|
| P.Audio P10/100MB | 73 -0.9 | 0.234 = | 26.7 +0.9 | 2.5 +1.2 | 99.1 -0.5 | close | + | |
| RCF 10 CX251 | 72 -1.9 | 0.237 = | 25 -0.8 | 3 +1.7 | 99.6 = | close | + | |
| RCF CX 10 N 251 | 72 -1.9 | 0.237 = | 25 -0.8 | 3 +1.7 | 99.6 = | close | + | |
| RCF CX 10N251 | 72 -1.9 | 0.237 = | 25 -0.8 | 3 +1.7 | 99.6 = | close | + | |
| RCF CX 10N251 v2015 | 72 -1.9 | 0.237 = | 25 -0.8 | 3 +1.7 | 99.6 = | close | + | |
| RCF L 10/750YK | 68 -5.9 | 0.236 = | 26 +0.2 | 2.5 +1.2 | 99.1 -0.5 | close | + | |
| PHL Audio 3450 | 80 +6.1 | 0.242 +0.01 | 25 -0.8 | 2.2 +0.9 | 100.8 +1.2 | close | + | |
| RCF L10/750YK | 68 -5.9 | 0.24 +0.01 | 26 +0.2 | 2.5 +1.2 | 97 -2.6 | close | 6 Ω vs 8 Ω: amp load changes | + |
| 18 Sound 10M600 | 70 -3.9 | 0.23 = | 25.6 -0.2 | 4 +2.7 | 102 +2.4 | close | + | |
| B&C 10 MD 26 | 76 +2.1 | 0.21 -0.02 | 20 -5.8 | 1.5 +0.2 | 99.4 -0.2 | close | + |
Compare the closest 3 against the 425-8H-II →
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.