Focal Utopia M SUB 10WM
Best box: 28.1 L bass reflex tuned to 29.0 Hz · F3 26.5 Hz
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Comparable 10.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Focal Utopia M SUB 10WM 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
- The textbook alignment (28.1 L at 27.6 Hz) would need a 102.8 cm port; the recommendation is retuned to 28.1 L at 29.0 Hz so the port can be built.
- Port length (92.5 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) | 28.1 Liters |
| Tuning Frequency (Fb) | 29.0 Hz |
| F3 (-3 dB Cutoff) | 26.5 Hz |
| F6 / F10 Extension | 24.1 Hz / 21.6 Hz |
| Port Inner Diameter | Ø 10.0 cm |
| Port Physical Length | 92.5 cm |
| First Pipe Resonance | 186.0 Hz |
| Estimated MOL @ F3 | 106.5 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 12.6 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 49.9 Hz |
| F3 (-3 dB Cutoff) | 51.2 Hz |
| F6 / F10 Extension | 38.5 Hz / 29.1 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 32.0 Hz |
| Total Q (Qts) | 0.45 |
| Electrical Q (Qes) | 0.526 |
| Mechanical Q (Qms) | 3.12 |
| Equivalent Volume (Vas) | 18.5 Liters |
| Diaphragm Area (Sd) | 346.0 cm² |
| DC Resistance (Re) | 4.0 Ω |
| Efficiency Bandwidth Product (EBP) | 60.9 |
| Linear Excursion (Xmax) | 14.0 mm |
| Thermal Power (Pe) | 500.0 W |
| Nominal Diameter | 10.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Focal Utopia M SUB 10WM?
Load Forge's calculated alignment puts Focal Utopia M SUB 10WM in a 28.1 liter vented enclosure tuned to 29.0 Hz, reaching an F3 cutoff of approximately 26.5 Hz.
Can Focal Utopia M SUB 10WM be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 12.6 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 51.2 Hz.
What port dimensions should be used for Focal Utopia M SUB 10WM to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 10.0 cm with a length of 92.5 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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