Sine Design

Tang Band W6-1139SI

subwoofer · EBP 81 → suits either box · nominal (full) — Tang Band datasheet (https://www.tb-speaker.com/uploads/files/5dd0617db1d4bed89bed1cc21f500e12.pdf)

Thiele/Small parameters

Fs (resonance)38 Hz
Qts0.4
Qes / Qms0.47 / 2.65
Vas11.8 L
Re / nominal Z— / 4 Ω
Xmax13.0 mm
Sensitivity83.2 dB (1 W/1 m, calc); 83 dB (2.83 V/1 m, mfr)
Power handling50 W

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

Datasheet (PDF) ↗ — manufacturer-hosted

Recommended enclosures

Sealed (Qtc 0.707) — Vb5.5 L
Sealed — Fc / F367.2 / 67.2 Hz
Ported (suggested) — Vb11.5 L
Ported — Fb / F338.3 / 37.5 Hz
Open in designer →Use my measured parameters →Buy at Parts Express →

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About this driver

The Tang Band W6-1139SI is a 6.5″ subwoofer with a free-air resonance of 38 Hz and a total Q (Qts) of 0.4. Its efficiency-bandwidth product (EBP) of 81 points toward either alignment. In a 5.5 L sealed box it reaches an F3 of 67.2 Hz (Qtc 0.707); a suggested 11.5 L box tuned to 38.3 Hz extends to about 37.5 Hz. See the sealed vs ported guide for how to choose.

Recommended partners

modeled estimate

The tweeters below pair well with the Tang Band W6-1139SI 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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