DB Drive WDXPRO9/6NC.4
Best box: 3.4 L bass reflex tuned to 146.6 Hz · F3 140.3 Hz
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Comparable 6.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the DB Drive WDXPRO9/6NC.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) | 3.4 Liters |
| Tuning Frequency (Fb) | 146.6 Hz |
| F3 (-3 dB Cutoff) | 140.3 Hz |
| F6 / F10 Extension | 125.3 Hz / 110.7 Hz |
| Port Inner Diameter ESTIMATED | Ø 5.0 cm |
| Port Physical Length | 4.5 cm |
| First Pipe Resonance | 3840.0 Hz |
| Estimated MOL @ F3 | 116.1 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 1.5 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 260.7 Hz |
| F3 (-3 dB Cutoff) | 261.5 Hz |
| F6 / F10 Extension | 198.2 Hz / 149.7 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 146.1 Hz |
| Total Q (Qts) | 0.38 |
| Electrical Q (Qes) | 0.412 |
| Mechanical Q (Qms) | 4.94 |
| Equivalent Volume (Vas) | 3.6 Liters |
| Diaphragm Area (Sd) | 159.4 cm² |
| DC Resistance (Re) | 3.1 Ω |
| Efficiency Bandwidth Product (EBP) | 354.9 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | 225.0 W |
| Nominal Diameter | 6.5" |
| 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 WDXPRO9/6NC.4?
Load Forge's calculated alignment puts DB Drive WDXPRO9/6NC.4 in a 3.4 liter vented enclosure tuned to 146.6 Hz, reaching an F3 cutoff of approximately 140.3 Hz.
Can DB Drive WDXPRO9/6NC.4 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 1.5 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 261.5 Hz.
What port dimensions should be used for DB Drive WDXPRO9/6NC.4 to avoid port chuffing?
Xmax is not published for DB Drive WDXPRO9/6NC.4, so the port is an empirical estimate: a 5.0 cm diameter with a length of 4.5 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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