Sine Design

Tang Band W3-881SJ

fullrange · EBP 161 → suits a ported box · nominal (full) — Tang Band datasheet (https://www.tb-speaker.com/uploads/files/f862594ec53a7dd0e8227b6ab04c9a5f.pdf)

Thiele/Small parameters

Fs (resonance)100 Hz
Qts0.58
Qes / Qms0.62 / 7.19
Vas2.3 L
Re / nominal Z6.6 Ω / 8 Ω
Xmax0.2 mm
Sensitivity87.5 dB (1 W/1 m, calc); 86 dB (2.83 V/1 m, mfr)
Power handling15 W

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

Datasheet (PDF) ↗ — manufacturer-hosted

Recommended enclosures

Sealed (Qtc 0.707) — Vb4.8 L
Sealed — Fc / F3121.9 / 121.9 Hz
Ported (suggested) — Vb7.7 L
Ported — Fb / F369.0 / 59.9 Hz
Open in designer →Use my measured parameters →Buy at Parts Express →

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About this driver

The Tang Band W3-881SJ is a 3″ fullrange with a free-air resonance of 100 Hz and a total Q (Qts) of 0.58. Its efficiency-bandwidth product (EBP) of 161 points toward a ported alignment. In a 4.8 L sealed box it reaches an F3 of 121.9 Hz (Qtc 0.707); a suggested 7.7 L box tuned to 69.0 Hz extends to about 59.9 Hz. See the sealed vs ported guide for how to choose.

Recommended partners

modeled estimate

The tweeters below pair well with the Tang Band W3-881SJ 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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