Sine Design

Tang Band W4-1320SJ

fullrange · EBP 153 → suits a ported box · nominal (full) — Tang Band datasheet (https://www.tb-speaker.com/uploads/files/8147fc957978bdc6e1b9a3c16ed02dec.pdf)

Thiele/Small parameters

Fs (resonance)75 Hz
Qts0.35
Qes / Qms0.49 / 1.29
Vas6.4 L
Re / nominal Z6.8 Ω / 8 Ω
Xmax3.0 mm
Sensitivity89.2 dB (1 W/1 m, calc); 89 dB (2.83 V/1 m, mfr)
Power handling25 W

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

Datasheet (PDF) ↗ — manufacturer-hosted

Recommended enclosures

Sealed (Qtc 0.707) — Vb2.1 L
Sealed — Fc / F3151.5 / 151.5 Hz
Ported (suggested) — Vb4.0 L
Ported — Fb / F386.7 / 90.2 Hz
Open in designer →Use my measured parameters →Buy at Parts Express →

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About this driver

The Tang Band W4-1320SJ is a 4″ fullrange with a free-air resonance of 75 Hz and a total Q (Qts) of 0.35. Its efficiency-bandwidth product (EBP) of 153 points toward a ported alignment. In a 2.1 L sealed box it reaches an F3 of 151.5 Hz (Qtc 0.707); a suggested 4.0 L box tuned to 86.7 Hz extends to about 90.2 Hz. See the sealed vs ported guide for how to choose.

Recommended partners

modeled estimate

The tweeters below pair well with the Tang Band W4-1320SJ 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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