Altec 917-8A
Thiele-Small parameters
| Nominal size | 12" |
|---|---|
| Impedance | 8 Ω |
| Fs | 45.3 Hz |
| Qts | 0.298 |
| Qes | 0.34 |
| Qms | 2.41 |
| Vas | 95.1 L |
| Sd | 503.2 cm² |
| Xmax | 1.3 mm |
| Re | 5.8 Ω |
| Bl | 15 T·m |
| Mms | 46.1 g |
| Pe | 60 W |
| Sensitivity | 97.5 dB |
Alignment hint
| EBP | 133 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 20.5 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 |
|---|---|---|---|---|---|---|---|---|
| Ciare CW321 | 45 -0.3 | 0.26 -0.04 | 94 -1.1 | 1.35 +0.05 | 96.5 -1 | close | 4 Ω vs 8 Ω: amp load changes | + |
| MC Kenzie C12.200L | 45 -0.3 | 0.296 = | 90 -5.1 | 4.2 +2.9 | 97.4 -0.1 | close | + | |
| Fertin Acoustics 30AP | 42 -3.3 | 0.282 -0.02 | 101 +5.9 | 2 +0.7 | 97.3 -0.2 | close | 30 W vs 60 W: lower power handling | + |
| Fertin Acoustics 30S | 42 -3.3 | 0.282 -0.02 | 101 +5.9 | 2 +0.7 | 97.2 -0.3 | close | 30 W vs 60 W: lower power handling | + |
| Eminence LEGEND EM 12 | 49 +3.7 | 0.279 -0.02 | 102.3 +7.2 | 1.3 = | 99 +1.5 | close | + | |
| Audax PR33ST150 | 46 +0.7 | 0.327 +0.03 | 90 -5.1 | 3.5 +2.2 | 97.2 -0.3 | close | + | |
| PHL Audio 4550 | 45 -0.3 | 0.289 -0.01 | 106 +10.9 | 4 +2.7 | 98.3 +0.8 | close | + | |
| Sica 12 N 3 PL | 46 +0.7 | 0.3 = | 87.9 -7.2 | 5.5 +4.2 | 98.5 +1 | close | + | |
| Ciare PW328 | 48 +2.7 | 0.32 +0.02 | 91 -4.1 | 3 +1.7 | 96.3 -1.2 | close | + | |
| Monacor SP-30A/200PRO | 45 -0.3 | 0.332 +0.03 | 114 +18.9 | 2 +0.7 | 98 +0.5 | close | + |
Compare the closest 3 against the 917-8A →
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.