Eminence PF-400
Best box: 181.3 L bass reflex tuned to 45.5 Hz · F3 43.4 Hz
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Comparable 15.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Eminence PF-400 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
- Large enclosure volume (181.3 L) requires extensive internal matrix bracing to prevent panel resonance.
- Limited linear excursion (Xmax: 0.79 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 181.3 Liters |
| Tuning Frequency (Fb) | 45.5 Hz |
| F3 (-3 dB Cutoff) | 43.4 Hz |
| F6 / F10 Extension | 38.2 Hz / 33.9 Hz |
| Port Inner Diameter | Ø 15.0 cm |
| Port Physical Length | 3.4 cm |
| First Pipe Resonance | 5077.0 Hz |
| Estimated MOL @ F3 | 109.0 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 120.9 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 74.8 Hz |
| F3 (-3 dB Cutoff) | 76.2 Hz |
| F6 / F10 Extension | 57.6 Hz / 43.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 58.0 Hz |
| Total Q (Qts) | 0.5 |
| Electrical Q (Qes) | 0.543 |
| Mechanical Q (Qms) | 6.37 |
| Equivalent Volume (Vas) | 120.8 Liters |
| Diaphragm Area (Sd) | 889.6 cm² |
| DC Resistance (Re) | 7.45 Ω |
| Efficiency Bandwidth Product (EBP) | 106.9 |
| Linear Excursion (Xmax) | 0.8 mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 15.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Eminence PF-400?
Load Forge's calculated alignment puts Eminence PF-400 in a 181.3 liter vented enclosure tuned to 45.5 Hz, reaching an F3 cutoff of approximately 43.4 Hz.
Can Eminence PF-400 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 120.9 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 76.2 Hz.
What port dimensions should be used for Eminence PF-400 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 15.0 cm with a length of 3.4 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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