Purifi Audio PTT4.0X04-NFA-01
Best box: 4.2 L bass reflex tuned to 68.2 Hz · F3 66.5 Hz
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Comparable 4.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Purifi Audio PTT4.0X04-NFA-01 does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 4.2 Liters |
| Tuning Frequency (Fb) | 68.2 Hz |
| F3 (-3 dB Cutoff) | 66.5 Hz |
| F6 / F10 Extension | 58.9 Hz / 51.9 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 26.6 cm |
| First Pipe Resonance | 648.0 Hz |
| Estimated MOL @ F3 | 101.8 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) | 123.9 Hz |
| F3 (-3 dB Cutoff) | 123.9 Hz |
| F6 / F10 Extension | 94.1 Hz / 71.1 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 68.0 Hz |
| Total Q (Qts) | 0.38 |
| Electrical Q (Qes) | 0.398 |
| Mechanical Q (Qms) | 8.3 |
| Equivalent Volume (Vas) | 4.5 Liters |
| Diaphragm Area (Sd) | 50.0 cm² |
| DC Resistance (Re) | 3.4 Ω |
| Efficiency Bandwidth Product (EBP) | 170.8 |
| Linear Excursion (Xmax) | 5.5 mm |
| Thermal Power (Pe) | 60.0 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 Audio PTT4.0X04-NFA-01?
Load Forge's calculated alignment puts Purifi Audio PTT4.0X04-NFA-01 in a 4.2 liter vented enclosure tuned to 68.2 Hz, reaching an F3 cutoff of approximately 66.5 Hz.
Can Purifi Audio PTT4.0X04-NFA-01 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 123.9 Hz.
What port dimensions should be used for Purifi Audio PTT4.0X04-NFA-01 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 26.6 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
Embed this design card on DIYAudio, AVSForum, Reddit, or Facebook. It shows the calculated F3, MOL (when the power rating is published) and box parameters.
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