Sine Design

Seas RW220

subwoofer · EBP 67 → suits either box · nominal (full) — Seas datasheet (https://www.seas.no/images/stories/lotus/pdfdataheet/rw220-l0022-04_v2.pdf)

Thiele/Small parameters

Fs (resonance)29 Hz
Qts0.36
Qes / Qms0.43 / 2.11
Vas68.0 L
Re / nominal Z3.2 Ω / 4 Ω
Xmax—
Sensitivity87.7 dB (1 W/1 m, calc)

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

Datasheet (PDF) ↗ — manufacturer-hosted

Recommended enclosures

Sealed (Qtc 0.707) — Vb23.8 L
Sealed — Fc / F357.0 / 57.0 Hz
Ported (suggested) — Vb46.7 L
Ported — Fb / F332.6 / 33.4 Hz
Open in designer →Use my measured parameters →Buy at Parts Express →

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About this driver

The Seas RW220 is a 8″ subwoofer with a free-air resonance of 29 Hz and a total Q (Qts) of 0.36. Its efficiency-bandwidth product (EBP) of 67 points toward either alignment. In a 23.8 L sealed box it reaches an F3 of 57.0 Hz (Qtc 0.707); a suggested 46.7 L box tuned to 32.6 Hz extends to about 33.4 Hz. See the sealed vs ported guide for how to choose.

Recommended partners

modeled estimate

The tweeters below pair well with the Seas RW220 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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