PURIFI PTT4.0M04-NFC-01
Best box: 1.5 L bass reflex tuned to 121.1 Hz · F3 119.9 Hz
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Comparable 4.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the PURIFI PTT4.0M04-NFC-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
- The textbook alignment (1.5 L at 67.3 Hz) would need a 83.1 cm port; the recommendation is retuned to 1.5 L at 121.1 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 1.5 Liters |
| Tuning Frequency (Fb) | 121.1 Hz |
| F3 (-3 dB Cutoff) | 119.9 Hz |
| F6 / F10 Extension | 110.1 Hz / 98.7 Hz |
| Port Inner Diameter | Ø 6.8 cm |
| Port Physical Length | 44.6 cm |
| First Pipe Resonance | 385.0 Hz |
| Estimated MOL @ F3 | 129.7 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 0.77 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 128.7 Hz |
| F3 (-3 dB Cutoff) | 120.5 Hz |
| F6 / F10 Extension | 93.4 Hz / 71.2 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 46.0 Hz |
| Total Q (Qts) | 0.25 |
| Electrical Q (Qes) | 0.264 |
| Mechanical Q (Qms) | 4.6 |
| Equivalent Volume (Vas) | 5.4 Liters |
| Diaphragm Area (Sd) | 56.7 cm² |
| DC Resistance (Re) | 3.4 Ω |
| Efficiency Bandwidth Product (EBP) | 174.0 |
| Linear Excursion (Xmax) | 13.7 mm |
| Thermal Power (Pe) | N/A 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 PTT4.0M04-NFC-01?
Load Forge's calculated alignment puts PURIFI PTT4.0M04-NFC-01 in a 1.5 liter vented enclosure tuned to 121.1 Hz, reaching an F3 cutoff of approximately 119.9 Hz.
Can PURIFI PTT4.0M04-NFC-01 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.77 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 120.5 Hz.
What port dimensions should be used for PURIFI PTT4.0M04-NFC-01 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 6.8 cm with a length of 44.6 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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