Sine Design

Seas L18RNX-P

woofer · EBP 100 → suits either box · nominal (full) — Seas datasheet (https://www.seas.no/images/stories/prestige/pdfdatasheet/h1224_l18rnx_p_datasheet.pdf)

Thiele/Small parameters

Fs (resonance)36 Hz
Qts0.31
Qes / Qms0.36 / 2.09
Vas30.0 L
Re / nominal Z5.8 Ω / 8 Ω
Xmax—
Sensitivity87.7 dB (1 W/1 m, calc); 88 dB (2.83 V/1 m, mfr)
Power handling100 W

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

Datasheet (PDF) ↗ — manufacturer-hosted

Recommended enclosures

Sealed (Qtc 0.707) — Vb7.1 L
Sealed — Fc / F382.1 / 82.1 Hz
Ported (suggested) — Vb12.6 L
Ported — Fb / F347.1 / 51.8 Hz
Open in designer →Use my measured parameters →Buy at Parts Express →

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About this driver

The Seas L18RNX-P is a 6″ woofer with a free-air resonance of 36 Hz and a total Q (Qts) of 0.31. Its efficiency-bandwidth product (EBP) of 100 points toward either alignment. In a 7.1 L sealed box it reaches an F3 of 82.1 Hz (Qtc 0.707); a suggested 12.6 L box tuned to 47.1 Hz extends to about 51.8 Hz. See the sealed vs ported guide for how to choose.

Recommended partners

modeled estimate

The tweeters below pair well with the Seas L18RNX-P 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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