PHL Audio 4071-1
Best box: 14.4 L bass reflex tuned to 71.3 Hz · F3 81.2 Hz
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Comparable 12.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the PHL Audio 4071-1 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) | 14.4 Liters |
| Tuning Frequency (Fb) | 71.3 Hz |
| F3 (-3 dB Cutoff) | 81.2 Hz |
| F6 / F10 Extension | 69.3 Hz / 59.1 Hz |
| Port Inner Diameter | Ø 12.5 cm |
| Port Physical Length | 41.3 cm |
| First Pipe Resonance | 416.0 Hz |
| Estimated MOL @ F3 | 117.6 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 7.5 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 133.0 Hz |
| F3 (-3 dB Cutoff) | 123.7 Hz |
| F6 / F10 Extension | 95.9 Hz / 73.0 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 47.0 Hz |
| Total Q (Qts) | 0.24 |
| Electrical Q (Qes) | 0.255 |
| Mechanical Q (Qms) | 4.14 |
| Equivalent Volume (Vas) | 57.8 Liters |
| Diaphragm Area (Sd) | 493.0 cm² |
| DC Resistance (Re) | 5.5 Ω |
| Efficiency Bandwidth Product (EBP) | 184.5 |
| Linear Excursion (Xmax) | 6.5 mm |
| Thermal Power (Pe) | 400.0 W |
| Nominal Diameter | 12.0" |
| 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 4071-1?
Load Forge's calculated alignment puts PHL Audio 4071-1 in a 14.4 liter vented enclosure tuned to 71.3 Hz, reaching an F3 cutoff of approximately 81.2 Hz.
Can PHL Audio 4071-1 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 7.5 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 123.7 Hz.
What port dimensions should be used for PHL Audio 4071-1 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 12.5 cm with a length of 41.3 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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