Sine Design

Eminence KAPPA-12A

fullrange · EBP 161 → suits a ported box · nominal (full) — Eminence datasheet (https://cdn.shopify.com/s/files/1/0270/8665/1462/files/Kappa_12A.pdf)

Thiele/Small parameters

Fs (resonance)45 Hz
Qts0.27
Qes / Qms0.28 / 7.76
Vas112.1 L
Re / nominal Z5.41 Ω / 8 Ω
Xmax3.2 mm
Sensitivity97.5 dB (1 W/1 m, calc); 99.3 dB (2.83 V/1 m, mfr)
Power handling450 W

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

Datasheet (PDF) ↗ — manufacturer-hosted

Recommended enclosures

Sealed (Qtc 0.707) — Vb19.1 L
Sealed — Fc / F3117.8 / 117.9 Hz
Ported (suggested) — Vb29.8 L
Ported — Fb / F367.9 / 79.8 Hz
Open in designer →Use my measured parameters →Buy at Parts Express →

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About this driver

The Eminence KAPPA-12A is a 12.5″ fullrange with a free-air resonance of 45 Hz and a total Q (Qts) of 0.27. Its efficiency-bandwidth product (EBP) of 161 points toward a ported alignment. In a 19.1 L sealed box it reaches an F3 of 117.9 Hz (Qtc 0.707); a suggested 29.8 L box tuned to 67.9 Hz extends to about 79.8 Hz. See the sealed vs ported guide for how to choose.

Recommended partners

modeled estimate

The tweeters below pair well with the Eminence KAPPA-12A 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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