Bomber PENTAXIAL 6X9″ BICHO PAPÃO 300 WRMS 4 OHMS PAR
Best box: 15.3 L bass reflex tuned to 51.0 Hz · F3 76.1 Hz
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Comparable 6.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Bomber PENTAXIAL 6X9″ BICHO PAPÃO 300 WRMS 4 OHMS PAR 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
- Limited linear excursion (Xmax: 2.0 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 15.3 Liters |
| Tuning Frequency (Fb) | 51.0 Hz |
| F3 (-3 dB Cutoff) | 76.1 Hz |
| F6 / F10 Extension | 65.0 Hz / 51.4 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 11.2 cm |
| First Pipe Resonance | 1534.0 Hz |
| Estimated MOL @ F3 | 103.9 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.91 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.287; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 19.1 Liters |
| System Q (Qtc) | 1.287 (above Butterworth: Qtc cannot fall below Qts (0.91)) |
| System Resonance (Fc) | 84.9 Hz |
| F3 (-3 dB Cutoff) | 69.1 Hz |
| F6 / F10 Extension | 58.8 Hz / 48.2 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 60.0 Hz |
| Total Q (Qts) | 0.91 |
| Electrical Q (Qes) | 1.209 |
| Mechanical Q (Qms) | 3.68 |
| Equivalent Volume (Vas) | 19.1 Liters |
| Diaphragm Area (Sd) | 204.2 cm² |
| DC Resistance (Re) | 3.3 Ω |
| Efficiency Bandwidth Product (EBP) | 49.6 |
| Linear Excursion (Xmax) | 2.0 mm |
| Thermal Power (Pe) | 150.0 W |
| Nominal Diameter | 6.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Bomber PENTAXIAL 6X9″ BICHO PAPÃO 300 WRMS 4 OHMS PAR?
Load Forge's calculated alignment puts Bomber PENTAXIAL 6X9″ BICHO PAPÃO 300 WRMS 4 OHMS PAR in a 15.3 liter vented enclosure tuned to 51.0 Hz, reaching an F3 cutoff of approximately 76.1 Hz.
Can Bomber PENTAXIAL 6X9″ BICHO PAPÃO 300 WRMS 4 OHMS PAR be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 19.1 liters with a Qtc of 1.287 (above Butterworth: Qtc cannot fall below Qts (0.91)), the system exhibits an F3 of 69.1 Hz.
What port dimensions should be used for Bomber PENTAXIAL 6X9″ BICHO PAPÃO 300 WRMS 4 OHMS PAR to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 11.2 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
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