Sine Design

Tang Band W6-623I

woofer · EBP 102 → suits a ported box · nominal (full) — Tang Band datasheet (https://www.tb-speaker.com/uploads/files/47cd5e9ed8664dbc4b12ed5188c2fb5d.pdf)

Thiele/Small parameters

Fs (resonance)46 Hz
Qts0.41
Qes / Qms0.45 / 5.21
Vas29.8 L
Re / nominal Z6 Ω / 8 Ω
Xmax4.0 mm
Sensitivity89.9 dB (1 W/1 m, calc); 89 dB (2.83 V/1 m, mfr)
Power handling30 W

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

Datasheet (PDF) ↗ — manufacturer-hosted

Recommended enclosures

Sealed (Qtc 0.707) — Vb15.1 L
Sealed — Fc / F379.3 / 79.3 Hz
Ported (suggested) — Vb31.5 L
Ported — Fb / F345.2 / 43.8 Hz
Open in designer →Use my measured parameters →Buy at Parts Express →

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About this driver

The Tang Band W6-623I is a 6.5″ woofer with a free-air resonance of 46 Hz and a total Q (Qts) of 0.41. Its efficiency-bandwidth product (EBP) of 102 points toward a ported alignment. In a 15.1 L sealed box it reaches an F3 of 79.3 Hz (Qtc 0.707); a suggested 31.5 L box tuned to 45.2 Hz extends to about 43.8 Hz. See the sealed vs ported guide for how to choose.

Recommended partners

modeled estimate

The tweeters below pair well with the Tang Band W6-623I 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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