Sine Design

Dayton Audio UM8-22

subwoofer · EBP 42 → suits a sealed box · nominal (full) — Dayton Audio datasheet (https://www.daytonaudio.com/images/resources/295-508--dayton-audio-UM8-22-specifications.pdf)

Thiele/Small parameters

Fs (resonance)31.6 Hz
Qts0.58
Qes / Qms0.75 / 2.51
Vas21.3 L
Re / nominal Z4.2 Ω / 2 Ω
Xmax16.0 mm
Sensitivity81.4 dB (1 W/1 m, calc); 84.2 dB (2.83 V/1 m, mfr)
Power handling300 W

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

Datasheet (PDF) ↗ — manufacturer-hosted

Recommended enclosures

Sealed (Qtc 0.707) — Vb43.8 L
Sealed — Fc / F338.5 / 38.5 Hz
Ported (suggested) — Vb70.6 L
Ported — Fb / F321.8 / 20.0 Hz
Open in designer →Use my measured parameters →Buy at Parts Express →

Affiliate disclosure: some links are affiliate links and we may earn a commission on qualifying purchases at no extra cost to you. Prices are estimates at the time of writing; verify on the retailer's site.

About this driver

The Dayton Audio UM8-22 is a 8″ subwoofer with a free-air resonance of 31.6 Hz and a total Q (Qts) of 0.58. Its efficiency-bandwidth product (EBP) of 42 points toward a sealed alignment. In a 43.8 L sealed box it reaches an F3 of 38.5 Hz (Qtc 0.707); a suggested 70.6 L box tuned to 21.8 Hz extends to about 20.0 Hz. See the sealed vs ported guide for how to choose.

Recommended partners

modeled estimate

The tweeters below pair well with the Dayton Audio UM8-22 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.

Related subwoofers