Dayton Audio UMII18-22 ULTIMAX II DVC
Thiele-Small parameters
| Nominal size | 18" |
|---|---|
| Impedance | 8 Ω |
| Fs | 22 Hz |
| Qts | 0.53 |
| Qes | 0.67 |
| Qms | 2.53 |
| Vas | 248.2 L |
| Sd | 1184 cm² |
| Xmax | 13.8 mm |
| Re | 4.2 Ω |
| Bl | 18.9 T·m |
| Mms | 414.4 g |
| Pe | 1200 W |
| Sensitivity | 90.7 dB |
Alignment hint
| EBP | 33 · 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
| Driver | Fs (Hz) | Qts | Vas (L) | Xmax (mm) | Sens (dB) | Fit | Notes | Compare |
|---|---|---|---|---|---|---|---|---|
| Dayton Audio UM18-22 v2015 | 19.5 -2.5 | 0.533 = | 212 -36.2 | 12.6 -1.2 | 88.6 -2.1 | close | Xmax 12.6 mm < 13.8 mm: lower excursion-limited SPL | + |
| FI Audio HT-3 | 21.3 -0.7 | 0.423 -0.11 | 235.9 -12.3 | 17 +3.2 | 92.9 +2.2 | usable | 4 Ω vs 8 Ω: amp load changes | + |
| Dayton Audio UM18-22 18 | 19.5 -2.5 | 0.487 -0.04 | 216.8 -31.4 | 12.2 -1.6 | 89 -1.7 | usable | Xmax 12.2 mm < 13.8 mm: lower excursion-limited SPL | + |
| Aura Sound NS18-992-4A | 20 -2 | 0.47 -0.06 | 322 +73.8 | 14.5 +0.7 | 93.2 +2.5 | usable | 4 Ω vs 8 Ω: amp load changes · 800 W vs 1200 W: lower power handling | + |
| Dayton Audio SS18-22 | 21 -1 | 0.374 -0.16 | 224 -24.2 | 12.8 -1 | 90.6 -0.1 | usable | Xmax 12.8 mm < 13.8 mm: lower excursion-limited SPL | + |
| Resonant Engineering XXX-18 | 29 +7 | 0.569 +0.04 | 244.2 -4 | 16 +2.2 | 97.9 +7.2 | usable | 2 Ω vs 8 Ω: amp load changes | + |
| Dayton Audio RSS460HO-4 | 19.6 -2.4 | 0.387 -0.14 | 298 +49.8 | 12.8 -1 | 92.9 +2.2 | usable | 4 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-SINGLE2 | 22.3 +0.3 | 0.652 +0.12 | 381 +132.8 | 12.3 -1.5 | 93.4 +2.7 | usable | 4 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 5400 | 20.5 -1.5 | 0.325 -0.2 | 240.7 -7.5 | 16 +2.2 | 93.1 +2.4 | usable | 4 Ω vs 8 Ω: amp load changes | + |
| Stereo Integrity HST-18 Dual 2 Ohms | 16.4 -5.6 | 0.388 -0.14 | 267 +18.8 | 19 +5.2 | 89.7 -1 | usable | 4 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.