Sine Design

Eminence ALPHA-4-4

tweeter · EBP 171 → suits a ported box · nominal (full) — Eminence datasheet (https://cdn.shopify.com/s/files/1/0270/8665/1462/files/Alpha_4_4.pdf)

Thiele/Small parameters

Fs (resonance)120 Hz
Qts0.63
Qes / Qms0.7 / 6.41
Vas1.7 L
Re / nominal Z3.42 Ω / —
Xmax2.6 mm
Sensitivity—

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

Datasheet (PDF) ↗ — manufacturer-hosted

Recommended enclosures

This is a tweeter; Thiele/Small box parameters are not used for enclosure design.

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About this driver

The Eminence ALPHA-4-4 is a 4″ tweeter with a free-air resonance of 120 Hz and a total Q (Qts) of 0.63. Its efficiency-bandwidth product (EBP) of 171 points toward a ported alignment. See the sealed vs ported guide for how to choose.

Recommended partners

modeled estimate

The woofers and midranges below pair well with the Eminence ALPHA-4-4 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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