PURIFI PTT6.5M04-NAA-08
Best box: 7.9 L bass reflex tuned to 58.9 Hz · F3 59.4 Hz
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Comparable 6.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the PURIFI PTT6.5M04-NAA-08 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 (7.9 L at 49.1 Hz) would need a 52.3 cm port; the recommendation is retuned to 7.9 L at 58.9 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 7.9 Liters |
| Tuning Frequency (Fb) | 58.9 Hz |
| F3 (-3 dB Cutoff) | 59.4 Hz |
| F6 / F10 Extension | 53.0 Hz / 46.5 Hz |
| Port Inner Diameter | Ø 7.5 cm |
| Port Physical Length | 43.0 cm |
| First Pipe Resonance | 400.0 Hz |
| Estimated MOL @ F3 | 125.5 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 3.9 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 92.6 Hz |
| F3 (-3 dB Cutoff) | 92.1 Hz |
| F6 / F10 Extension | 69.7 Hz / 52.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 36.0 Hz |
| Total Q (Qts) | 0.27 |
| Electrical Q (Qes) | 0.281 |
| Mechanical Q (Qms) | 6.8 |
| Equivalent Volume (Vas) | 22.7 Liters |
| Diaphragm Area (Sd) | 132.7 cm² |
| DC Resistance (Re) | 3.9 Ω |
| Efficiency Bandwidth Product (EBP) | 128.0 |
| Linear Excursion (Xmax) | 14.5 mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 6.5" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for PURIFI PTT6.5M04-NAA-08?
Load Forge's calculated alignment puts PURIFI PTT6.5M04-NAA-08 in a 7.9 liter vented enclosure tuned to 58.9 Hz, reaching an F3 cutoff of approximately 59.4 Hz.
Can PURIFI PTT6.5M04-NAA-08 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 3.9 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 92.1 Hz.
What port dimensions should be used for PURIFI PTT6.5M04-NAA-08 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 7.5 cm with a length of 43.0 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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