PURIFI PTT5.25X08-NFA-01
Best box: 4.6 L bass reflex tuned to 43.7 Hz · F3 48.5 Hz
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Comparable 5.25" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the PURIFI PTT5.25X08-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
- Port length (63.4 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) | 4.6 Liters |
| Tuning Frequency (Fb) | 43.7 Hz |
| F3 (-3 dB Cutoff) | 48.5 Hz |
| F6 / F10 Extension | 41.5 Hz / 35.7 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 63.4 cm |
| First Pipe Resonance | 271.0 Hz |
| Estimated MOL @ F3 | 113.4 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 2.3 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 83.0 Hz |
| F3 (-3 dB Cutoff) | 82.6 Hz |
| F6 / F10 Extension | 62.3 Hz / 46.9 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 32.0 Hz |
| Total Q (Qts) | 0.27 |
| Electrical Q (Qes) | 0.282 |
| Mechanical Q (Qms) | 6.6 |
| Equivalent Volume (Vas) | 13.2 Liters |
| Diaphragm Area (Sd) | 84.9 cm² |
| DC Resistance (Re) | 5.9 Ω |
| Efficiency Bandwidth Product (EBP) | 113.7 |
| Linear Excursion (Xmax) | 14.0 mm |
| Thermal Power (Pe) | N/A 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 PTT5.25X08-NFA-01?
Load Forge's calculated alignment puts PURIFI PTT5.25X08-NFA-01 in a 4.6 liter vented enclosure tuned to 43.7 Hz, reaching an F3 cutoff of approximately 48.5 Hz.
Can PURIFI PTT5.25X08-NFA-01 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 2.3 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 82.6 Hz.
What port dimensions should be used for PURIFI PTT5.25X08-NFA-01 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 63.4 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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