PURIFI PTT5.25X08-NFA-01 Mid-range Woofer
Best box: 4.7 L bass reflex tuned to 52.0 Hz · F3 51.9 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the PURIFI PTT5.25X08-NFA-01 Mid-range Woofer 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 (4.1 L at 45.2 Hz) would need a 125.1 cm port; the recommendation is retuned to 4.7 L at 52.0 Hz so the port can be built.
- Port length (98.8 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) | 4.7 Liters |
| Tuning Frequency (Fb) | 52.0 Hz |
| F3 (-3 dB Cutoff) | 51.9 Hz |
| F6 / F10 Extension | 46.4 Hz / 40.8 Hz |
| Port Inner Diameter | Ø 7.5 cm |
| Port Physical Length | 98.8 cm |
| First Pipe Resonance | 174.0 Hz |
| Estimated MOL @ F3 | 105.1 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 2.0 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 86.5 Hz |
| F3 (-3 dB Cutoff) | 87.4 Hz |
| F6 / F10 Extension | 66.1 Hz / 49.8 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 32.0 Hz |
| Total Q (Qts) | 0.26 |
| Electrical Q (Qes) | 0.274 |
| Mechanical Q (Qms) | 5.0 |
| Equivalent Volume (Vas) | 13.0 Liters |
| Diaphragm Area (Sd) | 220.0 cm² |
| DC Resistance (Re) | 3.8 Ω |
| Efficiency Bandwidth Product (EBP) | 116.7 |
| Linear Excursion (Xmax) | 9.8 mm |
| Thermal Power (Pe) | 250.0 W |
| Nominal Diameter | 8.0" |
| 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 Mid-range Woofer?
Load Forge's calculated alignment puts PURIFI PTT5.25X08-NFA-01 Mid-range Woofer in a 4.7 liter vented enclosure tuned to 52.0 Hz, reaching an F3 cutoff of approximately 51.9 Hz.
Can PURIFI PTT5.25X08-NFA-01 Mid-range Woofer be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 2.0 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 87.4 Hz.
What port dimensions should be used for PURIFI PTT5.25X08-NFA-01 Mid-range Woofer to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 7.5 cm with a length of 98.8 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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