Bomber WOOFER 15″ ATRACK 2.5K 4Ω 1250 WATTS RMS – BRANCO
Best box: 25.6 L bass reflex tuned to 59.5 Hz · F3 83.6 Hz
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Comparable 15.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Bomber WOOFER 15″ ATRACK 2.5K 4Ω 1250 WATTS RMS – BRANCO does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 25.6 Liters |
| Tuning Frequency (Fb) | 59.5 Hz |
| F3 (-3 dB Cutoff) | 83.6 Hz |
| F6 / F10 Extension | 70.6 Hz / 54.2 Hz |
| Port Inner Diameter | Ø 12.5 cm |
| Port Physical Length | 31.7 cm |
| First Pipe Resonance | 543.0 Hz |
| Estimated MOL @ F3 | 124.5 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.89 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.259; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 32.0 Liters |
| System Q (Qtc) | 1.259 (above Butterworth: Qtc cannot fall below Qts (0.89)) |
| System Resonance (Fc) | 99.0 Hz |
| F3 (-3 dB Cutoff) | 77.7 Hz |
| F6 / F10 Extension | 65.7 Hz / 53.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 70.0 Hz |
| Total Q (Qts) | 0.89 |
| Electrical Q (Qes) | 0.923 |
| Mechanical Q (Qms) | 24.8 |
| Equivalent Volume (Vas) | 32.0 Liters |
| Diaphragm Area (Sd) | 801.0 cm² |
| DC Resistance (Re) | 3.23 Ω |
| Efficiency Bandwidth Product (EBP) | 75.8 |
| Linear Excursion (Xmax) | 6.5 mm |
| Thermal Power (Pe) | 1250.0 W |
| Nominal Diameter | 15.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Bomber WOOFER 15″ ATRACK 2.5K 4Ω 1250 WATTS RMS – BRANCO?
Load Forge's calculated alignment puts Bomber WOOFER 15″ ATRACK 2.5K 4Ω 1250 WATTS RMS – BRANCO in a 25.6 liter vented enclosure tuned to 59.5 Hz, reaching an F3 cutoff of approximately 83.6 Hz.
Can Bomber WOOFER 15″ ATRACK 2.5K 4Ω 1250 WATTS RMS – BRANCO be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 32.0 liters with a Qtc of 1.259 (above Butterworth: Qtc cannot fall below Qts (0.89)), the system exhibits an F3 of 77.7 Hz.
What port dimensions should be used for Bomber WOOFER 15″ ATRACK 2.5K 4Ω 1250 WATTS RMS – BRANCO to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 12.5 cm with a length of 31.7 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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