Focal SUB 12 a bobina singola
Best box: 135.0 L bass reflex tuned to 27.2 Hz · F3 24.3 Hz
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Comparable 11.8" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Focal SUB 12 a bobina singola 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 (135.0 L at 19.4 Hz) would need a 202.7 cm port; the recommendation is retuned to 135.0 L at 27.2 Hz so the port can be built.
- 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.
- Port length (95.5 cm) exceeds a straight internal run; use an elbow bend, slotted vent or 3D folded duct to fit the enclosure.
- Large enclosure volume (135.0 L) requires extensive internal matrix bracing to prevent panel resonance.
Recommended Bass Reflex (Vented)
PORT NEEDS ELBOW / 3D| Net Box Volume (Vb) | 135.0 Liters |
| Tuning Frequency (Fb) | 27.2 Hz |
| F3 (-3 dB Cutoff) | 24.3 Hz |
| F6 / F10 Extension | 22.4 Hz / 20.2 Hz |
| Port Inner Diameter ESTIMATED | Ø 21.7 cm |
| Port Physical Length | 95.5 cm |
| First Pipe Resonance | 180.0 Hz |
| Estimated MOL @ F3 | 109.6 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 79.4 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 34.5 Hz |
| F3 (-3 dB Cutoff) | 39.8 Hz |
| F6 / F10 Extension | 28.6 Hz / 20.9 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 24.0 Hz |
| Total Q (Qts) | 0.484 |
| Electrical Q (Qes) | 0.534 |
| Mechanical Q (Qms) | 5.15 |
| Equivalent Volume (Vas) | 90.0 Liters |
| Diaphragm Area (Sd) | 471.0 cm² |
| DC Resistance (Re) | 3.0 Ω |
| Efficiency Bandwidth Product (EBP) | 44.9 |
| 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 a bobina singola?
Load Forge's calculated alignment puts Focal SUB 12 a bobina singola in a 135.0 liter vented enclosure tuned to 27.2 Hz, reaching an F3 cutoff of approximately 24.3 Hz.
Can Focal SUB 12 a bobina singola be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 79.4 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 39.8 Hz.
What port dimensions should be used for Focal SUB 12 a bobina singola to avoid port chuffing?
Xmax is not published for Focal SUB 12 a bobina singola, so the port is an empirical estimate: a 21.7 cm diameter with a length of 95.5 cm (area at least 12 in² per ft³ of net volume). Check the air velocity at your power level in Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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