PHL Audio 1280-8
Best box: 10.0 L bass reflex tuned to 66.8 Hz · F3 68.1 Hz
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Comparable 6.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the PHL Audio 1280-8 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) | 10.0 Liters |
| Tuning Frequency (Fb) | 66.8 Hz |
| F3 (-3 dB Cutoff) | 68.1 Hz |
| F6 / F10 Extension | 59.7 Hz / 52.1 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 9.6 cm |
| First Pipe Resonance | 1789.0 Hz |
| Estimated MOL @ F3 | 107.8 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 4.5 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 121.7 Hz |
| F3 (-3 dB Cutoff) | 119.7 Hz |
| F6 / F10 Extension | 91.2 Hz / 69.0 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 57.0 Hz |
| Total Q (Qts) | 0.32 |
| Electrical Q (Qes) | 0.351 |
| Mechanical Q (Qms) | 3.6 |
| Equivalent Volume (Vas) | 17.5 Liters |
| Diaphragm Area (Sd) | 133.0 cm² |
| DC Resistance (Re) | 6.1 Ω |
| Efficiency Bandwidth Product (EBP) | 162.3 |
| Linear Excursion (Xmax) | 5.0 mm |
| Thermal Power (Pe) | 100.0 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 PHL Audio 1280-8?
Load Forge's calculated alignment puts PHL Audio 1280-8 in a 10.0 liter vented enclosure tuned to 66.8 Hz, reaching an F3 cutoff of approximately 68.1 Hz.
Can PHL Audio 1280-8 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 4.5 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 119.7 Hz.
What port dimensions should be used for PHL Audio 1280-8 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 9.6 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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