Bomber 3.27.438-1.16.335-MANUAL-5-BBR-55W-RMS-4-OHMS
Best box: 3.4 L sealed · Fc 151.3 Hz · F3 131.5 Hz
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Comparable 5.25" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Bomber 3.27.438-1.16.335-MANUAL-5-BBR-55W-RMS-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
- Limited linear excursion (Xmax: 1.25 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Textbook Bass Reflex — not recommended (6.0 dB bass hump)
PORT BUILDABLE| Net Box Volume (Vb) | 2.7 Liters |
| Tuning Frequency (Fb) | 91.0 Hz |
| F3 (-3 dB Cutoff) | 153.2 Hz |
| F6 / F10 Extension | 141.4 Hz / 125.0 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 22.7 cm |
| First Pipe Resonance | 756.0 Hz |
| Estimated MOL @ F3 | 103.0 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 2.73 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 3.861; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 3.4 Liters |
| System Q (Qtc) | 3.861 (above Butterworth: Qtc cannot fall below Qts (2.73)) |
| System Resonance (Fc) | 151.3 Hz |
| F3 (-3 dB Cutoff) | 131.5 Hz |
| F6 / F10 Extension | 121.6 Hz / 108.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 107.0 Hz |
| Total Q (Qts) | 2.73 |
| Electrical Q (Qes) | 3.878 |
| Mechanical Q (Qms) | 9.22 |
| Equivalent Volume (Vas) | 3.4 Liters |
| Diaphragm Area (Sd) | 84.9 cm² |
| DC Resistance (Re) | 3.8 Ω |
| Efficiency Bandwidth Product (EBP) | 27.6 |
| Linear Excursion (Xmax) | 1.2 mm |
| Thermal Power (Pe) | 55.0 W |
| Nominal Diameter | 5.25" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Bomber 3.27.438-1.16.335-MANUAL-5-BBR-55W-RMS-4-OHMS?
A simple ported box is not recommended for Bomber 3.27.438-1.16.335-MANUAL-5-BBR-55W-RMS-4-OHMS: the textbook alignment (2.7 liters tuned to 91.0 Hz) needs a 22.7 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 Bomber 3.27.438-1.16.335-MANUAL-5-BBR-55W-RMS-4-OHMS be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 3.4 liters with a Qtc of 3.861 (above Butterworth: Qtc cannot fall below Qts (2.73)), the system exhibits an F3 of 131.5 Hz.
What port dimensions should be used for Bomber 3.27.438-1.16.335-MANUAL-5-BBR-55W-RMS-4-OHMS to avoid port chuffing?
A straight 5.0 cm port would need 22.7 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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