Sine Design

Seas CA15RLY

woofer · EBP 105 → suits a ported box · nominal (full) — Seas datasheet (https://www.seas.no/images/stories/prestige/pdfdatasheet/H1216_CA15RLY_SRA_Datasheet_.pdf)

Thiele/Small parameters

Fs (resonance)44 Hz
Qts0.34
Qes / Qms0.42 / 1.88
Vas14.0 L
Re / nominal Z5.6 Ω / 8 Ω
Xmax—
Sensitivity86.4 dB (1 W/1 m, calc); 87.5 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) — Vb4.2 L
Sealed — Fc / F391.5 / 91.5 Hz
Ported (suggested) — Vb8.0 L
Ported — Fb / F352.4 / 55.2 Hz
Open in designer →Use my measured parameters →Buy at Parts Express →

Affiliate disclosure: some links are affiliate links and we may earn a commission on qualifying purchases at no extra cost to you. Prices are estimates at the time of writing; verify on the retailer's site.

About this driver

The Seas CA15RLY is a 5″ woofer with a free-air resonance of 44 Hz and a total Q (Qts) of 0.34. Its efficiency-bandwidth product (EBP) of 105 points toward a ported alignment. In a 4.2 L sealed box it reaches an F3 of 91.5 Hz (Qtc 0.707); a suggested 8.0 L box tuned to 52.4 Hz extends to about 55.2 Hz. See the sealed vs ported guide for how to choose.

Recommended partners

modeled estimate

The tweeters below pair well with the Seas CA15RLY 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.

Related woofers