PURIFI PTT5.25X08-NAA-05
Best box: 5.9 L bass reflex tuned to 46.5 Hz · F3 45.6 Hz
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Comparable 5.25" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the PURIFI PTT5.25X08-NAA-05 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 (5.9 L at 37.2 Hz) would need a 68.5 cm port; the recommendation is retuned to 5.9 L at 46.5 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 5.9 Liters |
| Tuning Frequency (Fb) | 46.5 Hz |
| F3 (-3 dB Cutoff) | 45.6 Hz |
| F6 / F10 Extension | 41.2 Hz / 36.4 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 42.6 cm |
| First Pipe Resonance | 404.0 Hz |
| Estimated MOL @ F3 | 99.0 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 2.7 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 70.1 Hz |
| F3 (-3 dB Cutoff) | 71.7 Hz |
| F6 / F10 Extension | 53.7 Hz / 40.3 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 30.0 Hz |
| Total Q (Qts) | 0.3 |
| Electrical Q (Qes) | 0.316 |
| Mechanical Q (Qms) | 5.8 |
| Equivalent Volume (Vas) | 12.4 Liters |
| Diaphragm Area (Sd) | 84.9 cm² |
| DC Resistance (Re) | 5.9 Ω |
| Efficiency Bandwidth Product (EBP) | 94.8 |
| Linear Excursion (Xmax) | 9.8 mm |
| Thermal Power (Pe) | 70.0 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 PTT5.25X08-NAA-05?
Load Forge's calculated alignment puts PURIFI PTT5.25X08-NAA-05 in a 5.9 liter vented enclosure tuned to 46.5 Hz, reaching an F3 cutoff of approximately 45.6 Hz.
Can PURIFI PTT5.25X08-NAA-05 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 2.7 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 71.7 Hz.
What port dimensions should be used for PURIFI PTT5.25X08-NAA-05 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 42.6 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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