Audio System H 15 EVO
Best box: 74.6 L bass reflex tuned to 25.5 Hz · F3 26.3 Hz
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Comparable 15.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Audio System H 15 EVO 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
- Port length (98.5 cm) exceeds a straight internal run; use an elbow bend, slotted vent or 3D folded duct to fit the enclosure.
Recommended Bass Reflex (Vented)
PORT NEEDS ELBOW / 3D| Net Box Volume (Vb) | 74.6 Liters |
| Tuning Frequency (Fb) | 25.5 Hz |
| F3 (-3 dB Cutoff) | 26.3 Hz |
| F6 / F10 Extension | 22.9 Hz / 20.0 Hz |
| Port Inner Diameter | Ø 15.0 cm |
| Port Physical Length | 98.5 cm |
| First Pipe Resonance | 175.0 Hz |
| Estimated MOL @ F3 | 118.3 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 33.1 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 47.2 Hz |
| F3 (-3 dB Cutoff) | 48.7 Hz |
| F6 / F10 Extension | 36.6 Hz / 27.5 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 23.0 Hz |
| Total Q (Qts) | 0.34 |
| Electrical Q (Qes) | 0.372 |
| Mechanical Q (Qms) | 4.0 |
| Equivalent Volume (Vas) | 110.0 Liters |
| Diaphragm Area (Sd) | 855.0 cm² |
| DC Resistance (Re) | 2.0 Ω |
| Efficiency Bandwidth Product (EBP) | 61.9 |
| Linear Excursion (Xmax) | 20.0 mm |
| Thermal Power (Pe) | 2500.0 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 Audio System H 15 EVO?
Load Forge's calculated alignment puts Audio System H 15 EVO in a 74.6 liter vented enclosure tuned to 25.5 Hz, reaching an F3 cutoff of approximately 26.3 Hz.
Can Audio System H 15 EVO be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 33.1 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 48.7 Hz.
What port dimensions should be used for Audio System H 15 EVO to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 15.0 cm with a length of 98.5 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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