Bomber SUBWOOFER 12″ BICHO PAPÃO 400 WRMS 4 OHMS
Best box: 66.2 L bass reflex tuned to 26.8 Hz · F3 35.2 Hz
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Comparable 12.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Bomber SUBWOOFER 12″ BICHO PAPÃO 400 WRMS 4 OHMS 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 (66.2 L at 25.5 Hz) would need a 47.5 cm port; the recommendation is retuned to 66.2 L at 26.8 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 66.2 Liters |
| Tuning Frequency (Fb) | 26.8 Hz |
| F3 (-3 dB Cutoff) | 35.2 Hz |
| F6 / F10 Extension | 28.7 Hz / 22.4 Hz |
| Port Inner Diameter | Ø 10.0 cm |
| Port Physical Length | 42.4 cm |
| First Pipe Resonance | 406.0 Hz |
| Estimated MOL @ F3 | 112.2 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 241.1 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 34.0 Hz |
| F3 (-3 dB Cutoff) | 34.4 Hz |
| F6 / F10 Extension | 26.0 Hz / 19.7 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 30.0 Hz |
| Total Q (Qts) | 0.61 |
| Electrical Q (Qes) | 0.671 |
| Mechanical Q (Qms) | 6.68 |
| Equivalent Volume (Vas) | 82.8 Liters |
| Diaphragm Area (Sd) | 519.0 cm² |
| DC Resistance (Re) | 3.23 Ω |
| Efficiency Bandwidth Product (EBP) | 44.7 |
| Linear Excursion (Xmax) | 9.5 mm |
| Thermal Power (Pe) | 400.0 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 Bomber SUBWOOFER 12″ BICHO PAPÃO 400 WRMS 4 OHMS?
Load Forge's calculated alignment puts Bomber SUBWOOFER 12″ BICHO PAPÃO 400 WRMS 4 OHMS in a 66.2 liter vented enclosure tuned to 26.8 Hz, reaching an F3 cutoff of approximately 35.2 Hz.
Can Bomber SUBWOOFER 12″ BICHO PAPÃO 400 WRMS 4 OHMS be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 241.1 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 34.4 Hz.
What port dimensions should be used for Bomber SUBWOOFER 12″ BICHO PAPÃO 400 WRMS 4 OHMS to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 10.0 cm with a length of 42.4 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
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