Sine Design

SB Acoustics SB21SDCN-C000-4

tweeter · EBP 347 → suits a ported box · nominal (partial) — SB Acoustics datasheet (https://sbacoustics.com/wp-content/uploads/2020/04/SB21SDCN-C000-4.pdf)

Thiele/Small parameters

Fs (resonance)850 Hz
Qts1.22
Qes / Qms2.45 / 2.44
Vas—
Re / nominal Z— / 4 Ω
Xmax—
Sensitivity90 dB (2.83 V/1 m, mfr)
Power handling40 W

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

Datasheet (PDF) ↗ — manufacturer-hosted

Recommended enclosures

This is a tweeter; Thiele/Small box parameters are not used for enclosure design.

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About this driver

The SB Acoustics SB21SDCN-C000-4 is a 1″ tweeter with a free-air resonance of 850 Hz and a total Q (Qts) of 1.22. Its efficiency-bandwidth product (EBP) of 347 points toward a ported alignment. See the sealed vs ported guide for how to choose.

Recommended partners

modeled estimate

The woofers and midranges below pair well with the SB Acoustics SB21SDCN-C000-4 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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