Sine Design

Seas CA12RCY

fullrange · EBP 158 → suits a ported box · nominal (full) — Seas datasheet (https://www.seas.no/images/stories/prestige/pdfdatasheet/h1152_ca12rcy_datasheet.pdf)

Thiele/Small parameters

Fs (resonance)57 Hz
Qts0.31
Qes / Qms0.36 / 2.17
Vas5.0 L
Re / nominal Z6.4 Ω / 8 Ω
Xmax—
Sensitivity85.9 dB (1 W/1 m, calc); 86 dB (2.83 V/1 m, mfr)
Power handling60 W

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

Datasheet (PDF) ↗ — manufacturer-hosted

Recommended enclosures

Sealed (Qtc 0.707) — Vb1.2 L
Sealed — Fc / F3130.0 / 130.0 Hz
Ported (suggested) — Vb2.1 L
Ported — Fb / F374.6 / 82.1 Hz
Open in designer →Use my measured parameters →Buy at Parts Express →

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About this driver

The Seas CA12RCY is a 4″ fullrange with a free-air resonance of 57 Hz and a total Q (Qts) of 0.31. Its efficiency-bandwidth product (EBP) of 158 points toward a ported alignment. In a 1.2 L sealed box it reaches an F3 of 130.0 Hz (Qtc 0.707); a suggested 2.1 L box tuned to 74.6 Hz extends to about 82.1 Hz. See the sealed vs ported guide for how to choose.

Recommended partners

modeled estimate

The tweeters below pair well with the Seas CA12RCY 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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