Sine Design

Dayton Audio UMII8-22

subwoofer · EBP 46 → suits a sealed box · nominal (full) — Dayton Audio datasheet (https://www.daytonaudio.com/images/resources/295-708--dayton-audio-UMII8-22-spec-sheet.pdf)

Thiele/Small parameters

Fs (resonance)46 Hz
Qts0.75
Qes / Qms0.99 / 3.1
Vas8.4 L
Re / nominal Z3.9 Ω / 2 Ω
Xmax18.0 mm
Sensitivity81.0 dB (1 W/1 m, calc); 84.1 dB (2.83 V/1 m, mfr)
Power handling400 W

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

Datasheet (PDF) ↗ — manufacturer-hosted

Recommended enclosures

Sealed (Qtc 0.707) — VbInfinity L
Sealed — Fc / F346.0 / 43.5 Hz
Ported (suggested) — Vb65.0 L
Ported — Fb / F324.4 / 21.4 Hz
Open in designer →Use my measured parameters →Buy at Parts Express →

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About this driver

The Dayton Audio UMII8-22 is a 8″ subwoofer with a free-air resonance of 46 Hz and a total Q (Qts) of 0.75. Its efficiency-bandwidth product (EBP) of 46 points toward a sealed alignment. In a Infinity L sealed box it reaches an F3 of 43.5 Hz (Qtc 0.707); a suggested 65.0 L box tuned to 24.4 Hz extends to about 21.4 Hz. See the sealed vs ported guide for how to choose.

Recommended partners

modeled estimate

The tweeters below pair well with the Dayton Audio UMII8-22 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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