Sine Design

Eminence DELTA-12LFA

woofer · EBP 100 → suits either box · nominal (full) — Eminence datasheet (https://cdn.shopify.com/s/files/1/0270/8665/1462/files/Delta_12LFA.pdf)

Thiele/Small parameters

Fs (resonance)51 Hz
Qts0.47
Qes / Qms0.51 / 7.28
Vas68.0 L
Re / nominal Z6.06 Ω / 8 Ω
Xmax4.8 mm
Sensitivity94.3 dB (1 W/1 m, calc); 94.6 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) — Vb53.8 L
Sealed — Fc / F376.7 / 76.7 Hz
Ported (suggested) — Vb112.5 L
Ported — Fb / F343.6 / 39.9 Hz
Open in designer →Use my measured parameters →Buy at Parts Express →

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About this driver

The Eminence DELTA-12LFA is a 12.5″ woofer with a free-air resonance of 51 Hz and a total Q (Qts) of 0.47. Its efficiency-bandwidth product (EBP) of 100 points toward either alignment. In a 53.8 L sealed box it reaches an F3 of 76.7 Hz (Qtc 0.707); a suggested 112.5 L box tuned to 43.6 Hz extends to about 39.9 Hz. See the sealed vs ported guide for how to choose.

Recommended partners

modeled estimate

The tweeters below pair well with the Eminence DELTA-12LFA 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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