Sine Design

Eminence ALPHA-6C

woofer · EBP 218 → suits a ported box · nominal (full) — Eminence datasheet (https://cdn.shopify.com/s/files/1/0270/8665/1462/files/Alpha_6C.pdf)

Thiele/Small parameters

Fs (resonance)107 Hz
Qts0.45
Qes / Qms0.49 / 6.12
Vas5.7 L
Re / nominal Z3.2 Ω / 4 Ω
Xmax3.5 mm
Sensitivity93.3 dB (1 W/1 m, calc); 93.3 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) — Vb3.9 L
Sealed — Fc / F3168.1 / 168.1 Hz
Ported (suggested) — Vb8.1 L
Ported — Fb / F395.7 / 89.1 Hz
Open in designer →Use my measured parameters →Buy at Parts Express →

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About this driver

The Eminence ALPHA-6C is a 6.5″ woofer with a free-air resonance of 107 Hz and a total Q (Qts) of 0.45. Its efficiency-bandwidth product (EBP) of 218 points toward a ported alignment. In a 3.9 L sealed box it reaches an F3 of 168.1 Hz (Qtc 0.707); a suggested 8.1 L box tuned to 95.7 Hz extends to about 89.1 Hz. See the sealed vs ported guide for how to choose.

Recommended partners

modeled estimate

The tweeters below pair well with the Eminence ALPHA-6C 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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