Dayton Audio UM8-22
Best box: 13.4 L bass reflex tuned to 29.2 Hz · F3 41.2 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Dayton Audio UM8-22 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 (90.4 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) | 13.4 Liters |
| Tuning Frequency (Fb) | 29.2 Hz |
| F3 (-3 dB Cutoff) | 41.2 Hz |
| F6 / F10 Extension | 33.6 Hz / 25.6 Hz |
| Port Inner Diameter | Ø 6.8 cm |
| Port Physical Length | 90.4 cm |
| First Pipe Resonance | 190.0 Hz |
| Estimated MOL @ F3 | 104.9 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.64 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 0.905; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 16.7 Liters |
| System Q (Qtc) | 0.905 (above Butterworth) |
| System Resonance (Fc) | 48.5 Hz |
| F3 (-3 dB Cutoff) | 42.2 Hz |
| F6 / F10 Extension | 34.2 Hz / 27.0 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 34.3 Hz |
| Total Q (Qts) | 0.64 |
| Electrical Q (Qes) | 0.864 |
| Mechanical Q (Qms) | 2.47 |
| Equivalent Volume (Vas) | 16.7 Liters |
| Diaphragm Area (Sd) | 211.2 cm² |
| DC Resistance (Re) | 4.2 Ω |
| Efficiency Bandwidth Product (EBP) | 39.7 |
| Linear Excursion (Xmax) | 16.0 mm |
| Thermal Power (Pe) | 300.0 W |
| Nominal Diameter | 8.0" |
| 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 UM8-22?
Load Forge's calculated alignment puts Dayton Audio UM8-22 in a 13.4 liter vented enclosure tuned to 29.2 Hz, reaching an F3 cutoff of approximately 41.2 Hz.
Can Dayton Audio UM8-22 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 16.7 liters with a Qtc of 0.905 (above Butterworth), the system exhibits an F3 of 42.2 Hz.
What port dimensions should be used for Dayton Audio UM8-22 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 6.8 cm with a length of 90.4 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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