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Dayton Audio UMII18-22 ULTIMAX II DVC

18" · 8 Ω · 1200 W · 90.7 dB · datasheet ↗

Thiele-Small parameters

Nominal size18"
Impedance8 Ω
Fs22 Hz
Qts0.53
Qes0.67
Qms2.53
Vas248.2 L
Sd1184 cm²
Xmax13.8 mm
Re4.2 Ω
Bl18.9 T·m
Mms414.4 g
Pe1200 W
Sensitivity90.7 dB

Alignment hint

EBP33 · sealed
Sealed Vb (Qtc ≈ 0.71)≈ 318.2 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

DriverFs (Hz)QtsVas (L)Xmax (mm)Sens (dB)FitNotesCompare
Dayton Audio UM18-22 v201519.5 -2.50.533 =212 -36.212.6 -1.288.6 -2.1closeXmax 12.6 mm < 13.8 mm: lower excursion-limited SPL+
FI Audio HT-321.3 -0.70.423 -0.11235.9 -12.317 +3.292.9 +2.2usable4 Ω vs 8 Ω: amp load changes+
Dayton Audio UM18-22 1819.5 -2.50.487 -0.04216.8 -31.412.2 -1.689 -1.7usableXmax 12.2 mm < 13.8 mm: lower excursion-limited SPL+
Aura Sound NS18-992-4A20 -20.47 -0.06322 +73.814.5 +0.793.2 +2.5usable4 Ω vs 8 Ω: amp load changes · 800 W vs 1200 W: lower power handling+
Dayton Audio SS18-2221 -10.374 -0.16224 -24.212.8 -190.6 -0.1usableXmax 12.8 mm < 13.8 mm: lower excursion-limited SPL+
Resonant Engineering XXX-1829 +70.569 +0.04244.2 -416 +2.297.9 +7.2usable2 Ω vs 8 Ω: amp load changes+
Dayton Audio RSS460HO-419.6 -2.40.387 -0.14298 +49.812.8 -192.9 +2.2usable4 Ω vs 8 Ω: amp load changes · 900 W vs 1200 W: lower power handling · Xmax 12.8 mm < 13.8 mm: lower excursion-limited SPL+
FI Audio IB318-SINGLE222.3 +0.30.652 +0.12381 +132.812.3 -1.593.4 +2.7usable4 Ω vs 8 Ω: amp load changes · 600 W vs 1200 W: lower power handling · Xmax 12.3 mm < 13.8 mm: lower excursion-limited SPL+
TC Sounds LMS-ULTRA 540020.5 -1.50.325 -0.2240.7 -7.516 +2.293.1 +2.4usable4 Ω vs 8 Ω: amp load changes+
Stereo Integrity HST-18 Dual 2 Ohms16.4 -5.60.388 -0.14267 +18.819 +5.289.7 -1usable4 Ω vs 8 Ω: amp load changes+

Compare the closest 3 against the UMII18-22 ULTIMAX II DVC →

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.