Dayton Audio UMII12-22 Ultimax II 12" DVC Subwoofer 2 Ohm Per Coil
Best box: 79.4 L bass reflex tuned to 21.9 Hz · F3 28.4 Hz
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Comparable 12.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Dayton Audio UMII12-22 Ultimax II 12" DVC Subwoofer 2 Ohm Per Coil does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.
⚠️ Engineering Notice for Builders
- Port length (87.7 cm) exceeds a straight internal run; use an elbow bend, slotted vent or 3D folded duct to fit the enclosure.
Recommended Bass Reflex (Vented)
PORT NEEDS ELBOW / 3D| Net Box Volume (Vb) | 79.4 Liters |
| Tuning Frequency (Fb) | 21.9 Hz |
| F3 (-3 dB Cutoff) | 28.4 Hz |
| F6 / F10 Extension | 20.0 Hz / 16.8 Hz |
| Port Inner Diameter | Ø 12.5 cm |
| Port Physical Length | 87.7 cm |
| First Pipe Resonance | 196.0 Hz |
| Estimated MOL @ F3 | 111.9 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 89.2 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 38.5 Hz |
| F3 (-3 dB Cutoff) | 39.1 Hz |
| F6 / F10 Extension | 29.8 Hz / 22.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 31.0 Hz |
| Total Q (Qts) | 0.56 |
| Electrical Q (Qes) | 0.703 |
| Mechanical Q (Qms) | 2.75 |
| Equivalent Volume (Vas) | 53.0 Liters |
| Diaphragm Area (Sd) | 528.0 cm² |
| DC Resistance (Re) | 4.2 Ω |
| Efficiency Bandwidth Product (EBP) | 44.1 |
| Linear Excursion (Xmax) | 22.0 mm |
| Thermal Power (Pe) | 800.0 W |
| Nominal Diameter | 12.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Dayton Audio UMII12-22 Ultimax II 12" DVC Subwoofer 2 Ohm Per Coil?
Load Forge's calculated alignment puts Dayton Audio UMII12-22 Ultimax II 12" DVC Subwoofer 2 Ohm Per Coil in a 79.4 liter vented enclosure tuned to 21.9 Hz, reaching an F3 cutoff of approximately 28.4 Hz.
Can Dayton Audio UMII12-22 Ultimax II 12" DVC Subwoofer 2 Ohm Per Coil be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 89.2 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 39.1 Hz.
What port dimensions should be used for Dayton Audio UMII12-22 Ultimax II 12" DVC Subwoofer 2 Ohm Per Coil to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 12.5 cm with a length of 87.7 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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