Focal SUB 12 DUAL a doppia bobina
Best box: 155.1 L sealed · Fc 29.1 Hz · F3 26.1 Hz
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Comparable 11.8" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Focal SUB 12 DUAL a doppia bobina 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
- Xmax is not published, so the port size is an empirical estimate (area ≥ 12 in² per ft³ of net volume, minimum by driver size), not a displacement calculation. Check air velocity in Load Forge Studio.
- Straight vent would be 276.6 cm long: not physically buildable as a simple tube. Use a passive radiator, a folded slot port or model a 3D folded duct in Load Forge Studio.
- Large enclosure volume (121.5 L) requires extensive internal matrix bracing to prevent panel resonance.
Textbook Bass Reflex — not recommended
PORT NOT BUILDABLE| Net Box Volume (Vb) | 121.5 Liters |
| Tuning Frequency (Fb) | 16.8 Hz |
| F3 (-3 dB Cutoff) | 26.2 Hz |
| F6 / F10 Extension | 21.4 Hz / 13.4 Hz |
| Port Inner Diameter ESTIMATED | Ø 20.6 cm |
| Port Physical Length | 276.6 cm |
| First Pipe Resonance | 62.0 Hz |
| Estimated MOL @ F3 | 108.0 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 155.1 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 29.1 Hz |
| F3 (-3 dB Cutoff) | 26.1 Hz |
| F6 / F10 Extension | 22.0 Hz / 17.9 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 24.0 Hz |
| Total Q (Qts) | 0.573 |
| Electrical Q (Qes) | 0.642 |
| Mechanical Q (Qms) | 5.34 |
| Equivalent Volume (Vas) | 81.0 Liters |
| Diaphragm Area (Sd) | 471.0 cm² |
| DC Resistance (Re) | 3.5 Ω |
| Efficiency Bandwidth Product (EBP) | 37.4 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | 300.0 W |
| Nominal Diameter | 11.8" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Focal SUB 12 DUAL a doppia bobina?
A simple ported box is not recommended for Focal SUB 12 DUAL a doppia bobina: the textbook alignment (121.5 liters tuned to 16.8 Hz) needs a 276.6 cm port, and no nearby retune stays buildable without a bass hump. A sealed box, a passive radiator or a folded duct is the practical choice.
Can Focal SUB 12 DUAL a doppia bobina be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 155.1 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 26.1 Hz.
What port dimensions should be used for Focal SUB 12 DUAL a doppia bobina to avoid port chuffing?
A straight 20.6 cm port would need 276.6 cm of length, which does not fit a practical cabinet. Use a passive radiator or a folded/3D duct instead of a straight tube.
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