Sine Design

Tang Band W3-871SC

fullrange · EBP 155 → suits a ported box · nominal (full) — Tang Band datasheet (https://www.tb-speaker.com/uploads/files/f541a21197c78de3d83e1c5dbd9f5fc4.pdf)

Thiele/Small parameters

Fs (resonance)110 Hz
Qts0.59
Qes / Qms0.71 / 3.4
Vas1.6 L
Re / nominal Z6.6 Ω / 8 Ω
Xmax0.5 mm
Sensitivity86.7 dB (1 W/1 m, calc); 86 dB (2.83 V/1 m, mfr)
Power handling12 W

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

Datasheet (PDF) ↗ — manufacturer-hosted

Recommended enclosures

Sealed (Qtc 0.707) — Vb3.8 L
Sealed — Fc / F3131.8 / 131.8 Hz
Ported (suggested) — Vb5.8 L
Ported — Fb / F374.6 / 64.7 Hz
Open in designer →Use my measured parameters →Buy at Parts Express →

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About this driver

The Tang Band W3-871SC is a 3″ fullrange with a free-air resonance of 110 Hz and a total Q (Qts) of 0.59. Its efficiency-bandwidth product (EBP) of 155 points toward a ported alignment. In a 3.8 L sealed box it reaches an F3 of 131.8 Hz (Qtc 0.707); a suggested 5.8 L box tuned to 74.6 Hz extends to about 64.7 Hz. See the sealed vs ported guide for how to choose.

Recommended partners

modeled estimate

The tweeters below pair well with the Tang Band W3-871SC 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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