Bomber SUBWOOFER 12″ BICHO PAPÃO 1200 WRMS 4+4 OHMS
Best box: 31.1 L bass reflex tuned to 33.9 Hz · F3 41.3 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 1200 WRMS 4+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 (23.9 L at 32.3 Hz) would need a 138.6 cm port; the recommendation is retuned to 31.1 L at 33.9 Hz so the port can be built.
- Port length (94.0 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) | 31.1 Liters |
| Tuning Frequency (Fb) | 33.9 Hz |
| F3 (-3 dB Cutoff) | 41.3 Hz |
| F6 / F10 Extension | 33.5 Hz / 26.7 Hz |
| Port Inner Diameter | Ø 12.5 cm |
| Port Physical Length | 94.0 cm |
| First Pipe Resonance | 183.0 Hz |
| Estimated MOL @ F3 | 116.1 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.65 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 0.919; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 29.9 Liters |
| System Q (Qtc) | 0.919 (above Butterworth) |
| System Resonance (Fc) | 53.7 Hz |
| F3 (-3 dB Cutoff) | 46.6 Hz |
| F6 / F10 Extension | 37.8 Hz / 29.9 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 38.0 Hz |
| Total Q (Qts) | 0.65 |
| Electrical Q (Qes) | 0.694 |
| Mechanical Q (Qms) | 10.28 |
| Equivalent Volume (Vas) | 29.9 Liters |
| Diaphragm Area (Sd) | 453.0 cm² |
| DC Resistance (Re) | 3.6 Ω |
| Efficiency Bandwidth Product (EBP) | 54.8 |
| Linear Excursion (Xmax) | 18.0 mm |
| Thermal Power (Pe) | 1200.0 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 1200 WRMS 4+4 OHMS?
Load Forge's calculated alignment puts Bomber SUBWOOFER 12″ BICHO PAPÃO 1200 WRMS 4+4 OHMS in a 31.1 liter vented enclosure tuned to 33.9 Hz, reaching an F3 cutoff of approximately 41.3 Hz.
Can Bomber SUBWOOFER 12″ BICHO PAPÃO 1200 WRMS 4+4 OHMS be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 29.9 liters with a Qtc of 0.919 (above Butterworth), the system exhibits an F3 of 46.6 Hz.
What port dimensions should be used for Bomber SUBWOOFER 12″ BICHO PAPÃO 1200 WRMS 4+4 OHMS to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 12.5 cm with a length of 94.0 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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