PURIFI PTT5.25X04-NFA-02
Best box: 3.5 L bass reflex tuned to 59.4 Hz · F3 59.9 Hz
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Comparable 5.25" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the PURIFI PTT5.25X04-NFA-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
- The textbook alignment (3.5 L at 44.0 Hz) would need a 83.3 cm port; the recommendation is retuned to 3.5 L at 59.4 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 3.5 Liters |
| Tuning Frequency (Fb) | 59.4 Hz |
| F3 (-3 dB Cutoff) | 59.9 Hz |
| F6 / F10 Extension | 53.9 Hz / 47.5 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 44.1 cm |
| First Pipe Resonance | 390.0 Hz |
| Estimated MOL @ F3 | 105.7 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 1.8 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 84.7 Hz |
| F3 (-3 dB Cutoff) | 85.1 Hz |
| F6 / F10 Extension | 64.0 Hz / 48.0 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 29.0 Hz |
| Total Q (Qts) | 0.24 |
| Electrical Q (Qes) | 0.249 |
| Mechanical Q (Qms) | 6.9 |
| Equivalent Volume (Vas) | 14.0 Liters |
| Diaphragm Area (Sd) | 85.0 cm² |
| DC Resistance (Re) | 3.7 Ω |
| Efficiency Bandwidth Product (EBP) | 116.6 |
| Linear Excursion (Xmax) | 9.8 mm |
| Thermal Power (Pe) | 250.0 W |
| Nominal Diameter | 5.25" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for PURIFI PTT5.25X04-NFA-02?
Load Forge's calculated alignment puts PURIFI PTT5.25X04-NFA-02 in a 3.5 liter vented enclosure tuned to 59.4 Hz, reaching an F3 cutoff of approximately 59.9 Hz.
Can PURIFI PTT5.25X04-NFA-02 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 1.8 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 85.1 Hz.
What port dimensions should be used for PURIFI PTT5.25X04-NFA-02 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 44.1 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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