PURIFI PTT6.5X04-NAB-02
Best box: 13.7 L bass reflex tuned to 30.5 Hz · F3 32.3 Hz
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Comparable 6.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the PURIFI PTT6.5X04-NAB-02 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 (80.6 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) | 13.7 Liters |
| Tuning Frequency (Fb) | 30.5 Hz |
| F3 (-3 dB Cutoff) | 32.3 Hz |
| F6 / F10 Extension | 27.9 Hz / 24.2 Hz |
| Port Inner Diameter | Ø 6.8 cm |
| Port Physical Length | 80.6 cm |
| First Pipe Resonance | 214.0 Hz |
| Estimated MOL @ F3 | 104.4 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 6.2 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 56.9 Hz |
| F3 (-3 dB Cutoff) | 58.6 Hz |
| F6 / F10 Extension | 44.0 Hz / 33.2 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 26.0 Hz |
| Total Q (Qts) | 0.32 |
| Electrical Q (Qes) | 0.342 |
| Mechanical Q (Qms) | 5.0 |
| Equivalent Volume (Vas) | 24.0 Liters |
| Diaphragm Area (Sd) | 133.0 cm² |
| DC Resistance (Re) | 3.6 Ω |
| Efficiency Bandwidth Product (EBP) | 76.0 |
| Linear Excursion (Xmax) | 14.7 mm |
| Thermal Power (Pe) | 300.0 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 PURIFI PTT6.5X04-NAB-02?
Load Forge's calculated alignment puts PURIFI PTT6.5X04-NAB-02 in a 13.7 liter vented enclosure tuned to 30.5 Hz, reaching an F3 cutoff of approximately 32.3 Hz.
Can PURIFI PTT6.5X04-NAB-02 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 6.2 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 58.6 Hz.
What port dimensions should be used for PURIFI PTT6.5X04-NAB-02 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 6.8 cm with a length of 80.6 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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