Eminence ALPHA 4-8
Thiele-Small parameters
| Nominal size | 4" |
|---|---|
| Impedance | 8 Ω |
| Fs | 123 Hz |
| Qts | 0.75 |
| Qes | 0.84 |
| Qms | 6.83 |
| Vas | 1.94 L |
| Sd | 57.7 cm² |
| Xmax | 2.6 mm |
| Re | 6.73 Ω |
| Bl | 4.94 T·m |
| Mms | 4 g |
| Pe | 55 W |
| Sensitivity | 88 dB |
Alignment hint
| EBP | 146 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | Qts too high |
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 |
|---|---|---|---|---|---|---|---|---|
| Eminence ALPHA 4-4 | 120 -3 | 0.63 -0.12 | 1.76 -0.18 | 2.6 = | 88 = | close | 4 Ω vs 8 Ω: amp load changes | + |
| Faital PRO 4FE35 | 100 -23 | 0.83 +0.08 | 2.4 +0.46 | 2.73 +0.13 | 91 +3 | usable | 30 W vs 55 W: lower power handling | + |
| Faital PRO 4FE32 | 100 -23 | 0.61 -0.14 | 2.3 +0.36 | 2.73 +0.13 | 91 +3 | usable | 30 W vs 55 W: lower power handling | + |
| Faital PRO 4FE35 | 100 -23 | 0.73 -0.02 | 2.4 +0.46 | 1.73 -0.87 | 91 +3 | usable | 4 Ω vs 8 Ω: amp load changes · 30 W vs 55 W: lower power handling · Xmax 1.73 mm < 2.6 mm: lower excursion-limited SPL | + |
| Faital PRO 4FE32 | 100 -23 | 0.81 +0.06 | 2.4 +0.46 | 1.83 -0.77 | 91 +3 | usable | 16 Ω vs 8 Ω: amp load changes · 30 W vs 55 W: lower power handling · Xmax 1.83 mm < 2.6 mm: lower excursion-limited SPL | + |
| Sica 4 L 1 SL | 108.3 -14.7 | 0.63 -0.12 | 1.2 -0.74 | 2.4 -0.2 | 86.2 -1.8 | usable | Xmax 2.4 mm < 2.6 mm: lower excursion-limited SPL | + |
| Faital PRO 4FE42 | 110 -13 | 0.47 -0.28 | 1.9 -0.04 | 2.83 +0.23 | 94 +6 | usable | 40 W vs 55 W: lower power handling | + |
| Sica 4 D 0.8 CS | 140 +17 | 0.92 +0.17 | 1.2 -0.74 | 1.3 -1.3 | 87.5 -0.5 | risky | 4 Ω vs 8 Ω: amp load changes · 35 W vs 55 W: lower power handling · Xmax 1.3 mm < 2.6 mm: lower excursion-limited SPL | + |
| Faital PRO 4FE32 | 100 -23 | 0.53 -0.22 | 2.5 +0.56 | 1.73 -0.87 | 91 +3 | risky | 4 Ω vs 8 Ω: amp load changes · 30 W vs 55 W: lower power handling · Xmax 1.73 mm < 2.6 mm: lower excursion-limited SPL | + |
| Faital PRO 4FE35 | 100 -23 | 1.16 +0.41 | 2.3 +0.36 | 1.83 -0.77 | 91 +3 | risky | 16 Ω vs 8 Ω: amp load changes · 30 W vs 55 W: lower power handling · Xmax 1.83 mm < 2.6 mm: lower excursion-limited SPL | + |
Compare the closest 3 against the ALPHA 4-8 →
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.