Sine Design

Dayton Audio SD270A-88

subwoofer · EBP 52 → suits either box · nominal (full) — Dayton Audio datasheet (https://www.daytonaudio.com/images/resources/295-486-dayton-audio-sd270a-88-specifications-47085.pdf)

Thiele/Small parameters

Fs (resonance)26.2 Hz
Qts0.43
Qes / Qms0.5 / 3.23
Vas107.5 L
Re / nominal Z3.16 Ω / 4 Ω
Xmax6.0 mm
Sensitivity87.7 dB (1 W/1 m, calc); 87.8 dB (2.83 V/1 m, mfr)
Power handling80 W

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

Datasheet (PDF) ↗ — manufacturer-hosted

Recommended enclosures

Sealed (Qtc 0.707) — Vb63.1 L
Sealed — Fc / F343.1 / 43.1 Hz
Ported (suggested) — Vb132.7 L
Ported — Fb / F324.5 / 23.3 Hz
Open in designer →Use my measured parameters →Buy at Parts Express →

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About this driver

The Dayton Audio SD270A-88 is a 10.5″ subwoofer with a free-air resonance of 26.2 Hz and a total Q (Qts) of 0.43. Its efficiency-bandwidth product (EBP) of 52 points toward either alignment. In a 63.1 L sealed box it reaches an F3 of 43.1 Hz (Qtc 0.707); a suggested 132.7 L box tuned to 24.5 Hz extends to about 23.3 Hz. See the sealed vs ported guide for how to choose.

Recommended partners

modeled estimate

The tweeters below pair well with the Dayton Audio SD270A-88 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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