Apocalypse DB-5.5K 15" D1/D2
Best box: 41.9 L bass reflex tuned to 29.5 Hz · F3 27.7 Hz
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Comparable 15.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Apocalypse DB-5.5K 15" D1/D2 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 (41.9 L at 28.1 Hz) would need a 102.2 cm port; the recommendation is retuned to 41.9 L at 29.5 Hz so the port can be built.
- Port length (91.9 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) | 41.9 Liters |
| Tuning Frequency (Fb) | 29.5 Hz |
| F3 (-3 dB Cutoff) | 27.7 Hz |
| F6 / F10 Extension | 24.9 Hz / 22.1 Hz |
| Port Inner Diameter | Ø 12.5 cm |
| Port Physical Length | 91.9 cm |
| First Pipe Resonance | 187.0 Hz |
| Estimated MOL @ F3 | 119.6 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 18.3 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 51.3 Hz |
| F3 (-3 dB Cutoff) | 52.7 Hz |
| F6 / F10 Extension | 39.7 Hz / 29.9 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 30.0 Hz |
| Total Q (Qts) | 0.41 |
| Electrical Q (Qes) | 0.459 |
| Mechanical Q (Qms) | 3.84 |
| Equivalent Volume (Vas) | 36.1 Liters |
| Diaphragm Area (Sd) | 855.0 cm² |
| DC Resistance (Re) | 3.4 Ω |
| Efficiency Bandwidth Product (EBP) | 65.4 |
| Linear Excursion (Xmax) | 10.0 mm |
| Thermal Power (Pe) | 5500.0 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 Apocalypse DB-5.5K 15" D1/D2?
Load Forge's calculated alignment puts Apocalypse DB-5.5K 15" D1/D2 in a 41.9 liter vented enclosure tuned to 29.5 Hz, reaching an F3 cutoff of approximately 27.7 Hz.
Can Apocalypse DB-5.5K 15" D1/D2 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 18.3 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 52.7 Hz.
What port dimensions should be used for Apocalypse DB-5.5K 15" D1/D2 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 12.5 cm with a length of 91.9 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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Not sure if DB-5.5K 15" D1/D2 fits your physical space?
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