Bomber SUBWOOFER 12″ CARBON 500 WRMS 4+4 OHMS
Best box: 60.0 L sealed · Fc 48.1 Hz · F3 39.5 Hz
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Comparable 12.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Bomber SUBWOOFER 12″ CARBON 500 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
- Port length (51.6 cm) exceeds a straight internal run; use an elbow bend, slotted vent or 3D folded duct to fit the enclosure.
Textbook Bass Reflex — not recommended (4.5 dB bass hump)
PORT NEEDS ELBOW / 3D| Net Box Volume (Vb) | 48.0 Liters |
| Tuning Frequency (Fb) | 28.9 Hz |
| F3 (-3 dB Cutoff) | 44.0 Hz |
| F6 / F10 Extension | 37.9 Hz / 30.4 Hz |
| Port Inner Diameter | Ø 10.0 cm |
| Port Physical Length | 51.6 cm |
| First Pipe Resonance | 334.0 Hz |
| Estimated MOL @ F3 | 114.4 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 1.0 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.414; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 60.0 Liters |
| System Q (Qtc) | 1.414 (above Butterworth: Qtc cannot fall below Qts (1.00)) |
| System Resonance (Fc) | 48.1 Hz |
| F3 (-3 dB Cutoff) | 39.5 Hz |
| F6 / F10 Extension | 33.9 Hz / 28.1 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 34.0 Hz |
| Total Q (Qts) | 1.0 |
| Electrical Q (Qes) | 1.137 |
| Mechanical Q (Qms) | 8.29 |
| Equivalent Volume (Vas) | 60.0 Liters |
| Diaphragm Area (Sd) | 523.0 cm² |
| DC Resistance (Re) | 2.96 Ω |
| Efficiency Bandwidth Product (EBP) | 29.9 |
| Linear Excursion (Xmax) | 9.5 mm |
| Thermal Power (Pe) | 500.0 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″ CARBON 500 WRMS 4+4 OHMS?
A simple ported box is not recommended for Bomber SUBWOOFER 12″ CARBON 500 WRMS 4+4 OHMS: the textbook alignment (48.0 liters tuned to 28.9 Hz) needs a 51.6 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 SUBWOOFER 12″ CARBON 500 WRMS 4+4 OHMS be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 60.0 liters with a Qtc of 1.414 (above Butterworth: Qtc cannot fall below Qts (1.00)), the system exhibits an F3 of 39.5 Hz.
What port dimensions should be used for Bomber SUBWOOFER 12″ CARBON 500 WRMS 4+4 OHMS to avoid port chuffing?
A straight 10.0 cm port would need 51.6 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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