Sine Design

Eminence LEGEND-BP-122

subwoofer · EBP 61 → suits either box · nominal (full) — Eminence datasheet (https://cdn.shopify.com/s/files/1/0270/8665/1462/files/Legend_BP122.pdf)

Thiele/Small parameters

Fs (resonance)35 Hz
Qts0.54
Qes / Qms0.57 / 9.26
Vas157.4 L
Re / nominal Z5.66 Ω / 8 Ω
Xmax6.2 mm
Sensitivity92.6 dB (1 W/1 m, calc); 94.1 dB (2.83 V/1 m, mfr)
Power handling250 W

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

Datasheet (PDF) ↗ — manufacturer-hosted

Recommended enclosures

Sealed (Qtc 0.707) — Vb220.5 L
Sealed — Fc / F345.8 / 45.8 Hz
Ported (suggested) — Vb412.1 L
Ported — Fb / F326.0 / 22.8 Hz
Open in designer →Use my measured parameters →Buy at Parts Express →

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About this driver

The Eminence LEGEND-BP-122 is a 13″ subwoofer with a free-air resonance of 35 Hz and a total Q (Qts) of 0.54. Its efficiency-bandwidth product (EBP) of 61 points toward either alignment. In a 220.5 L sealed box it reaches an F3 of 45.8 Hz (Qtc 0.707); a suggested 412.1 L box tuned to 26.0 Hz extends to about 22.8 Hz. See the sealed vs ported guide for how to choose.

Recommended partners

modeled estimate

The tweeters below pair well with the Eminence LEGEND-BP-122 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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