Dayton Audio UM18-22
subwoofer · EBP 31 → suits a sealed box · nominal (full) — Dayton Audio spec sheet (manufacturer)
Thiele/Small parameters
| Fs (resonance) | 26.2 Hz |
| Qts | 0.7 |
| Qes / Qms | 0.85 / 4.05 |
| Vas | 144.7 L |
| Re / nominal Z | 4.3 Ω / 4 Ω |
| Xmax | 22.0 mm |
| Sensitivity | 86.7 dB (1 W/1 m, calc); 89.5 dB (2.83 V/1 m, mfr) |
| Power handling | 1000 W |
Published (nominal) values, params full — verify by measurement (DATS/REW) before building. datasheet
Recommended enclosures
| Sealed (Qtc 0.707) — Vb | 7199.0 L |
| Sealed — Fc / F3 | 26.5 / 26.5 Hz |
| Ported (suggested) — Vb | 891.9 L |
| Ported — Fb / F3 | 14.9 / 20.0 Hz |
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About this driver
The Dayton Audio UM18-22 is a 18″ subwoofer with a free-air resonance of 26.2 Hz and a total Q (Qts) of 0.7. Its efficiency-bandwidth product (EBP) of 31 points toward a sealed alignment. In a 7199.0 L sealed box it reaches an F3 of 26.5 Hz (Qtc 0.707); a suggested 891.9 L box tuned to 14.9 Hz extends to about 20.0 Hz. See the sealed vs ported guide for how to choose.
Ultimax; dual 2 ohm VC, params with coils in series; Vd 2681 cm3.
Recommended partners
modeled estimateThese tweeters could pair with the Dayton Audio UM18-22 in a two-way design, but the seed Thiele/Small data is too thin to grade the match yet — add or measure T/S (Fs, Sd, Xmax) to compute a real compatibility grade. You can still open a pair in the guided builder.
- Dayton Audio ND25FA-4Incompatible· 0/100
Crossover not modelable yet — tweeter needs published Thiele/Small data.
Build this pair → - Dayton Audio RS28F-4Incompatible· 0/100
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Build this pair → - Peerless by Tymphany D27TG35-06Incompatible· 0/100
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Build this pair → - SB Acoustics SB29RDC-C000-4Incompatible· 0/100
Crossover not modelable yet — tweeter needs published Thiele/Small data.
Build this pair → - Seas 27TBFC/G H1212-06Incompatible· 0/100
Crossover not modelable yet — tweeter needs published Thiele/Small data.
Build this pair →
Modeled estimate from T/S + geometry — no measurements. The verdict is robust; it improves with measured FRD/ZMA data.