Apocalypse DB-SA2508 D2
Best box: 56.4 L bass reflex tuned to 29.0 Hz · F3 28.7 Hz
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Comparable 12.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Apocalypse DB-SA2508 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 (56.4 L at 25.2 Hz) would need a 58.6 cm port; the recommendation is retuned to 56.4 L at 29.0 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 56.4 Liters |
| Tuning Frequency (Fb) | 29.0 Hz |
| F3 (-3 dB Cutoff) | 28.7 Hz |
| F6 / F10 Extension | 24.6 Hz / 21.6 Hz |
| Port Inner Diameter | Ø 10.0 cm |
| Port Physical Length | 42.5 cm |
| First Pipe Resonance | 405.0 Hz |
| Estimated MOL @ F3 | 112.9 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 57.6 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 44.4 Hz |
| F3 (-3 dB Cutoff) | 45.1 Hz |
| F6 / F10 Extension | 34.1 Hz / 25.8 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 35.0 Hz |
| Total Q (Qts) | 0.55 |
| Electrical Q (Qes) | 0.616 |
| Mechanical Q (Qms) | 5.13 |
| Equivalent Volume (Vas) | 37.6 Liters |
| Diaphragm Area (Sd) | 530.0 cm² |
| DC Resistance (Re) | 3.4 Ω |
| Efficiency Bandwidth Product (EBP) | 56.8 |
| Linear Excursion (Xmax) | 10.0 mm |
| Thermal Power (Pe) | 800.0 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 Apocalypse DB-SA2508 D2?
Load Forge's calculated alignment puts Apocalypse DB-SA2508 D2 in a 56.4 liter vented enclosure tuned to 29.0 Hz, reaching an F3 cutoff of approximately 28.7 Hz.
Can Apocalypse DB-SA2508 D2 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 57.6 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 45.1 Hz.
What port dimensions should be used for Apocalypse DB-SA2508 D2 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 10.0 cm with a length of 42.5 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
Embed this design card on DIYAudio, AVSForum, Reddit, or Facebook. It shows the calculated F3, MOL (when the power rating is published) and box parameters.
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