Sine Design

Seas L26RFX-P

woofer · EBP 51 → suits either box · nominal (full) — Seas datasheet (https://www.seas.no/images/stories/prestige/pdfdatasheet/h1209_l26rfx_p_datasheet.pdf)

Thiele/Small parameters

Fs (resonance)20 Hz
Qts0.33
Qes / Qms0.39 / 2.15
Vas171.0 L
Re / nominal Z6.3 Ω / 8 Ω
Xmax—
Sensitivity87.3 dB (1 W/1 m, calc); 88 dB (2.83 V/1 m, mfr)
Power handling125 W

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

Datasheet (PDF) ↗ — manufacturer-hosted

Recommended enclosures

Sealed (Qtc 0.707) — Vb47.6 L
Sealed — Fc / F342.8 / 42.9 Hz
Ported (suggested) — Vb88.1 L
Ported — Fb / F324.6 / 26.2 Hz
Open in designer →Use my measured parameters →Buy at Parts Express →

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About this driver

The Seas L26RFX-P is a 10″ woofer with a free-air resonance of 20 Hz and a total Q (Qts) of 0.33. Its efficiency-bandwidth product (EBP) of 51 points toward either alignment. In a 47.6 L sealed box it reaches an F3 of 42.9 Hz (Qtc 0.707); a suggested 88.1 L box tuned to 24.6 Hz extends to about 26.2 Hz. See the sealed vs ported guide for how to choose.

Recommended partners

modeled estimate

The tweeters below pair well with the Seas L26RFX-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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