← all drivers

Eminence ALPHA 4-8

4" · 8 Ω · 55 W · 88 dB · datasheet ↗

Thiele-Small parameters

Nominal size4"
Impedance8 Ω
Fs123 Hz
Qts0.75
Qes0.84
Qms6.83
Vas1.94 L
Sd57.7 cm²
Xmax2.6 mm
Re6.73 Ω
Bl4.94 T·m
Mms4 g
Pe55 W
Sensitivity88 dB

Alignment hint

EBP146 · 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

DriverFs (Hz)QtsVas (L)Xmax (mm)Sens (dB)FitNotesCompare
Eminence ALPHA 4-4120 -30.63 -0.121.76 -0.182.6 =88 =close4 Ω vs 8 Ω: amp load changes+
Faital PRO 4FE35100 -230.83 +0.082.4 +0.462.73 +0.1391 +3usable30 W vs 55 W: lower power handling+
Faital PRO 4FE32100 -230.61 -0.142.3 +0.362.73 +0.1391 +3usable30 W vs 55 W: lower power handling+
Faital PRO 4FE35100 -230.73 -0.022.4 +0.461.73 -0.8791 +3usable4 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 4FE32100 -230.81 +0.062.4 +0.461.83 -0.7791 +3usable16 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 SL108.3 -14.70.63 -0.121.2 -0.742.4 -0.286.2 -1.8usableXmax 2.4 mm < 2.6 mm: lower excursion-limited SPL+
Faital PRO 4FE42110 -130.47 -0.281.9 -0.042.83 +0.2394 +6usable40 W vs 55 W: lower power handling+
Sica 4 D 0.8 CS140 +170.92 +0.171.2 -0.741.3 -1.387.5 -0.5risky4 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 4FE32100 -230.53 -0.222.5 +0.561.73 -0.8791 +3risky4 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 4FE35100 -231.16 +0.412.3 +0.361.83 -0.7791 +3risky16 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.