Sine Design

Eminence ALPHA-3-8

fullrange · EBP 223 → suits a ported box · nominal (full) — Eminence datasheet (https://cdn.shopify.com/s/files/1/0270/8665/1462/files/Alpha_3_8.pdf)

Thiele/Small parameters

Fs (resonance)118 Hz
Qts0.5
Qes / Qms0.53 / 7.94
Vas0.8 L
Re / nominal Z5.12 Ω / —
Xmax2.4 mm
Sensitivity—

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

Datasheet (PDF) ↗ — manufacturer-hosted

Recommended enclosures

T/S are full — fetch the datasheet for the full parameters to model a box.

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About this driver

The Eminence ALPHA-3-8 is a 3″ fullrange with a free-air resonance of 118 Hz and a total Q (Qts) of 0.5. Its efficiency-bandwidth product (EBP) of 223 points toward a ported alignment. See the sealed vs ported guide for how to choose.

Recommended partners

modeled estimate

The tweeters below pair well with the Eminence ALPHA-3-8 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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