PHY-HP KM30 SAG
Best box: 59.5 L bass reflex tuned to 30.7 Hz · F3 29.6 Hz
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Comparable 12.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the PHY-HP KM30 SAG 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
- Limited linear excursion (Xmax: 3.0 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) | 59.5 Liters |
| Tuning Frequency (Fb) | 30.7 Hz |
| F3 (-3 dB Cutoff) | 29.6 Hz |
| F6 / F10 Extension | 26.3 Hz / 23.3 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 6.9 cm |
| First Pipe Resonance | 2485.0 Hz |
| Estimated MOL @ F3 | 103.5 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 25.9 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 55.5 Hz |
| F3 (-3 dB Cutoff) | 57.0 Hz |
| F6 / F10 Extension | 42.9 Hz / 32.3 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 32.0 Hz |
| Total Q (Qts) | 0.4 |
| Electrical Q (Qes) | 0.462 |
| Mechanical Q (Qms) | 3.0 |
| Equivalent Volume (Vas) | 55.0 Liters |
| Diaphragm Area (Sd) | 490.0 cm² |
| DC Resistance (Re) | 7.5 Ω |
| Efficiency Bandwidth Product (EBP) | 69.3 |
| Linear Excursion (Xmax) | 3.0 mm |
| Thermal Power (Pe) | 80.0 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 PHY-HP KM30 SAG?
Load Forge's calculated alignment puts PHY-HP KM30 SAG in a 59.5 liter vented enclosure tuned to 30.7 Hz, reaching an F3 cutoff of approximately 29.6 Hz.
Can PHY-HP KM30 SAG be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 25.9 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 57.0 Hz.
What port dimensions should be used for PHY-HP KM30 SAG to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 6.9 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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