Sine Design

Faital Pro 4FE42

fullrange · EBP 220 → suits a ported box · nominal (full) — Faital Pro datasheet (https://faitalpro.com/products/files/4FE42/8/4FE42_datasheet_8.pdf)

Thiele/Small parameters

Fs (resonance)110 Hz
Qts0.47
Qes / Qms0.5 / 8
Vas1.9 L
Re / nominal Z5.4 Ω / 8 Ω
Xmax2.8 mm
Sensitivity88.9 dB (1 W/1 m, calc); 94 dB (2.83 V/1 m, mfr)
Power handling40 W

Published (nominal) values, params full — verify by measurement (DATS/REW) before building.

Datasheet (PDF) ↗ — manufacturer-hosted

Recommended enclosures

Sealed (Qtc 0.707) — Vb1.5 L
Sealed — Fc / F3165.5 / 165.5 Hz
Ported (suggested) — Vb3.1 L
Ported — Fb / F394.1 / 86.1 Hz
Open in designer →Use my measured parameters →Buy at Parts Express →

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About this driver

The Faital Pro 4FE42 is a 4″ fullrange with a free-air resonance of 110 Hz and a total Q (Qts) of 0.47. Its efficiency-bandwidth product (EBP) of 220 points toward a ported alignment. In a 1.5 L sealed box it reaches an F3 of 165.5 Hz (Qtc 0.707); a suggested 3.1 L box tuned to 94.1 Hz extends to about 86.1 Hz. See the sealed vs ported guide for how to choose.

Recommended partners

modeled estimate

The tweeters below pair well with the Faital Pro 4FE42 in a two-way design — each grade is a modeled estimate of the crossover match, with a suggested crossover point. Open any pair in the guided builder to design the crossover and total the parts.

Modeled estimate from T/S + geometry — no measurements. The verdict is robust; it improves with measured FRD/ZMA data.

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