Sine Design

Eminence ALPHA-15A

woofer · EBP 27 → suits a sealed box · nominal (full) — Eminence datasheet (https://cdn.shopify.com/s/files/1/0270/8665/1462/files/Alpha_15A.pdf)

Thiele/Small parameters

Fs (resonance)41 Hz
Qts1.26
Qes / Qms1.53 / 7.23
Vas259.9 L
Re / nominal Z5.88 Ω / 8 Ω
Xmax3.8 mm
Sensitivity92.5 dB (1 W/1 m, calc); 97 dB (2.83 V/1 m, mfr)

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

Datasheet (PDF) ↗ — manufacturer-hosted

Recommended enclosures

Sealed (Qtc 0.707) — VbInfinity L
Sealed — Fc / F341.0 / 29.8 Hz
Ported (suggested) — Vb11146.5 L
Ported — Fb / F312.8 / 27.1 Hz
Open in designer →Use my measured parameters →Buy at Parts Express →

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About this driver

The Eminence ALPHA-15A is a 16″ woofer with a free-air resonance of 41 Hz and a total Q (Qts) of 1.26. Its efficiency-bandwidth product (EBP) of 27 points toward a sealed alignment. In a Infinity L sealed box it reaches an F3 of 29.8 Hz (Qtc 0.707); a suggested 11146.5 L box tuned to 12.8 Hz extends to about 27.1 Hz. See the sealed vs ported guide for how to choose.

Recommended partners

modeled estimate

The tweeters below pair well with the Eminence ALPHA-15A 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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