Sine Design

Eminence LEGEND-BP-102-4

woofer · EBP 88 → suits either box · nominal (full) — Eminence datasheet (https://cdn.shopify.com/s/files/1/0270/8665/1462/files/Legend_BP102_4.pdf)

Thiele/Small parameters

Fs (resonance)35 Hz
Qts0.38
Qes / Qms0.4 / 10.61
Vas103.9 L
Re / nominal Z2.7 Ω / 4 Ω
Xmax6.2 mm
Sensitivity92.3 dB (1 W/1 m, calc); 90.5 dB (2.83 V/1 m, mfr)
Power handling200 W

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

Datasheet (PDF) ↗ — manufacturer-hosted

Recommended enclosures

Sealed (Qtc 0.707) — Vb42.2 L
Sealed — Fc / F365.1 / 65.1 Hz
Ported (suggested) — Vb85.3 L
Ported — Fb / F337.2 / 37.3 Hz
Open in designer →Use my measured parameters →Buy at Parts Express →

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About this driver

The Eminence LEGEND-BP-102-4 is a 10.5″ woofer with a free-air resonance of 35 Hz and a total Q (Qts) of 0.38. Its efficiency-bandwidth product (EBP) of 88 points toward either alignment. In a 42.2 L sealed box it reaches an F3 of 65.1 Hz (Qtc 0.707); a suggested 85.3 L box tuned to 37.2 Hz extends to about 37.3 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-102-4 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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