PURIFI PTT4.0X08-NAC-03
Best box: 5.3 L bass reflex tuned to 48.4 Hz · F3 45.7 Hz
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Comparable 4.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the PURIFI PTT4.0X08-NAC-03 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 (5.3 L at 42.1 Hz) would need a 59.1 cm port; the recommendation is retuned to 5.3 L at 48.4 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 5.3 Liters |
| Tuning Frequency (Fb) | 48.4 Hz |
| F3 (-3 dB Cutoff) | 45.7 Hz |
| F6 / F10 Extension | 41.4 Hz / 36.8 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 43.8 cm |
| First Pipe Resonance | 392.0 Hz |
| Estimated MOL @ F3 | 102.8 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) | 77.2 Hz |
| F3 (-3 dB Cutoff) | 78.6 Hz |
| F6 / F10 Extension | 59.0 Hz / 44.4 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 43.0 Hz |
| Total Q (Qts) | 0.39 |
| Electrical Q (Qes) | 0.431 |
| Mechanical Q (Qms) | 4.1 |
| Equivalent Volume (Vas) | 5.3 Liters |
| Diaphragm Area (Sd) | 56.7 cm² |
| DC Resistance (Re) | 6.5 Ω |
| Efficiency Bandwidth Product (EBP) | 99.8 |
| Linear Excursion (Xmax) | 6.8 mm |
| Thermal Power (Pe) | 200.0 W |
| Nominal Diameter | 4.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for PURIFI PTT4.0X08-NAC-03?
Load Forge's calculated alignment puts PURIFI PTT4.0X08-NAC-03 in a 5.3 liter vented enclosure tuned to 48.4 Hz, reaching an F3 cutoff of approximately 45.7 Hz.
Can PURIFI PTT4.0X08-NAC-03 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 78.6 Hz.
What port dimensions should be used for PURIFI PTT4.0X08-NAC-03 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 43.8 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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