Dayton Audio UM18-22 18

18" · 8 Ω · 1000 W · 89 dB · datasheet ↗

Thiele-Small parameters

Nominal size	18"
Impedance	8 Ω
Fs	19.5 Hz
Qts	0.487
Qes	0.578
Qms	3.082
Vas	216.8 L
Sd	1213 cm²
Xmax	12.2 mm
Re	4.46 Ω
Bl	24.5 T·m
Mms	633.2 g
Pe	1000 W
Sensitivity	89 dB

Alignment hint

EBP	34 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 195.6 L

EBP < 50: favours a sealed (closed) alignment.

Rules of thumb from T/S parameters only. Verify against a real simulation before cutting wood.

Substitute candidates

Driver	Fs (Hz)	Qts	Vas (L)	Xmax (mm)	Sens (dB)	Fit	Notes	Compare
Dayton Audio UM18-22 v2015	19.5 =	0.533 +0.05	212 -4.8	12.6 +0.4	88.6 -0.4	close		+
Dayton Audio UMII18-22 ULTIMAX II DVC	22 +2.5	0.53 +0.04	248.2 +31.4	13.8 +1.6	90.7 +1.7	usable		+
Dayton Audio SS18-22	21 +1.5	0.374 -0.11	224 +7.2	12.8 +0.6	90.6 +1.6	usable		+
FI Audio HT-3	21.3 +1.8	0.423 -0.06	235.9 +19.1	17 +4.8	92.9 +3.9	usable	4 Ω vs 8 Ω: amp load changes	+
Aura Sound NS18-992-4A	20 +0.5	0.47 -0.02	322 +105.2	14.5 +2.3	93.2 +4.2	usable	4 Ω vs 8 Ω: amp load changes	+
Stereo Integrity HST-18 Dual 2 Ohms	16.4 -3.1	0.388 -0.1	267 +50.2	19 +6.8	89.7 +0.7	usable	4 Ω vs 8 Ω: amp load changes	+
Dayton Audio RSS460HO-4	19.6 +0.1	0.387 -0.1	298 +81.2	12.8 +0.6	92.9 +3.9	usable	4 Ω vs 8 Ω: amp load changes	+
CSS Audio Maelstrom 18 DVC by Exodus Audio	17.4 -2.1	0.376 -0.11	313 +96.2	14.7 +2.5	91.2 +2.2	usable	4 Ω vs 8 Ω: amp load changes	+
TC Sounds LMS-ULTRA 5400	20.5 +1	0.325 -0.16	240.7 +23.9	16 +3.8	93.1 +4.1	usable	4 Ω vs 8 Ω: amp load changes	+
Dayton Audio RSS460HO-4 v2015	18.8 -0.7	0.322 -0.16	272 +55.2	11.9 -0.3	93.1 +4.1	usable	4 Ω vs 8 Ω: amp load changes · Xmax 11.9 mm < 12.2 mm: lower excursion-limited SPL	+

Compare the closest 3 against the UM18-22 18 →

Ranked on parameter similarity only (Qts, Fs, Vas, Xmax, sensitivity). Same nominal size required. A hint, not a simulation, model the swap before cutting or buying.

Used in enclosures (0)

No enclosure in the catalog uses this driver yet.