PURIFI PTT6.5M04-NFA-01
Best box: 7.3 L bass reflex tuned to 62.7 Hz · F3 63.7 Hz
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Comparable 6.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the PURIFI PTT6.5M04-NFA-01 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
- Limited linear excursion (Xmax: 3.9 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 7.3 Liters |
| Tuning Frequency (Fb) | 62.7 Hz |
| F3 (-3 dB Cutoff) | 63.7 Hz |
| F6 / F10 Extension | 55.9 Hz / 48.7 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 16.9 cm |
| First Pipe Resonance | 1016.0 Hz |
| Estimated MOL @ F3 | 109.5 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 3.3 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 115.3 Hz |
| F3 (-3 dB Cutoff) | 112.2 Hz |
| F6 / F10 Extension | 85.8 Hz / 65.1 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 55.0 Hz |
| Total Q (Qts) | 0.33 |
| Electrical Q (Qes) | 0.358 |
| Mechanical Q (Qms) | 4.2 |
| Equivalent Volume (Vas) | 11.7 Liters |
| Diaphragm Area (Sd) | 132.7 cm² |
| DC Resistance (Re) | 3.9 Ω |
| Efficiency Bandwidth Product (EBP) | 153.6 |
| Linear Excursion (Xmax) | 3.9 mm |
| Thermal Power (Pe) | 250.0 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 PTT6.5M04-NFA-01?
Load Forge's calculated alignment puts PURIFI PTT6.5M04-NFA-01 in a 7.3 liter vented enclosure tuned to 62.7 Hz, reaching an F3 cutoff of approximately 63.7 Hz.
Can PURIFI PTT6.5M04-NFA-01 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 3.3 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 112.2 Hz.
What port dimensions should be used for PURIFI PTT6.5M04-NFA-01 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 16.9 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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