DB Drive WDXPRO9/8NC.4
Best box: 16.5 L bass reflex tuned to 92.6 Hz · F3 85.6 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the DB Drive WDXPRO9/8NC.4 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
- Xmax is not published, so the port size is an empirical estimate (area ≥ 12 in² per ft³ of net volume, minimum by driver size), not a displacement calculation. Check air velocity in Load Forge Studio.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 16.5 Liters |
| Tuning Frequency (Fb) | 92.6 Hz |
| F3 (-3 dB Cutoff) | 85.6 Hz |
| F6 / F10 Extension | 77.3 Hz / 69.0 Hz |
| Port Inner Diameter ESTIMATED | Ø 10.0 cm |
| Port Physical Length | 9.5 cm |
| First Pipe Resonance | 1813.0 Hz |
| Estimated MOL @ F3 | 117.7 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 7.3 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 160.3 Hz |
| F3 (-3 dB Cutoff) | 162.4 Hz |
| F6 / F10 Extension | 122.9 Hz / 92.8 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 103.2 Hz |
| Total Q (Qts) | 0.43 |
| Electrical Q (Qes) | 0.47 |
| Mechanical Q (Qms) | 5.1 |
| Equivalent Volume (Vas) | 12.4 Liters |
| Diaphragm Area (Sd) | 249.0 cm² |
| DC Resistance (Re) | 3.0 Ω |
| Efficiency Bandwidth Product (EBP) | 219.8 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | 300.0 W |
| Nominal Diameter | 8.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for DB Drive WDXPRO9/8NC.4?
Load Forge's calculated alignment puts DB Drive WDXPRO9/8NC.4 in a 16.5 liter vented enclosure tuned to 92.6 Hz, reaching an F3 cutoff of approximately 85.6 Hz.
Can DB Drive WDXPRO9/8NC.4 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 7.3 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 162.4 Hz.
What port dimensions should be used for DB Drive WDXPRO9/8NC.4 to avoid port chuffing?
Xmax is not published for DB Drive WDXPRO9/8NC.4, so the port is an empirical estimate: a 10.0 cm diameter with a length of 9.5 cm (area at least 12 in² per ft³ of net volume). Check the air velocity at your power level in Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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