Audio System HX 08 EVO
Best box: 17.7 L bass reflex tuned to 35.4 Hz · F3 32.7 Hz
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Comparable 7.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Audio System HX 08 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
- The textbook alignment (17.7 L at 27.2 Hz) would need a 172.6 cm port; the recommendation is retuned to 17.7 L at 35.4 Hz so the port can be built.
- Xmax is not published, so the port size is an empirical estimate (area ≥ 12 in² per ft³ of net volume, minimum by driver size), not a displacement calculation. Check air velocity in Load Forge Studio.
- Port length (99.0 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) | 17.7 Liters |
| Tuning Frequency (Fb) | 35.4 Hz |
| F3 (-3 dB Cutoff) | 32.7 Hz |
| F6 / F10 Extension | 30.4 Hz / 27.7 Hz |
| Port Inner Diameter ESTIMATED | Ø 10.0 cm |
| Port Physical Length | 99.0 cm |
| First Pipe Resonance | 174.0 Hz |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 13.9 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 48.5 Hz |
| F3 (-3 dB Cutoff) | 92.6 Hz |
| F6 / F10 Extension | 59.6 Hz / 38.0 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 36.0 Hz |
| Total Q (Qts) | 0.52 |
| Electrical Q (Qes) | 0.589 |
| Mechanical Q (Qms) | 4.46 |
| Equivalent Volume (Vas) | 11.8 Liters |
| Diaphragm Area (Sd) | 185.0 cm² |
| DC Resistance (Re) | 2.0 Ω |
| Efficiency Bandwidth Product (EBP) | 61.2 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 7.5" |
| 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 HX 08 EVO?
Load Forge's calculated alignment puts Audio System HX 08 EVO in a 17.7 liter vented enclosure tuned to 35.4 Hz, reaching an F3 cutoff of approximately 32.7 Hz.
Can Audio System HX 08 EVO be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 13.9 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 92.6 Hz.
What port dimensions should be used for Audio System HX 08 EVO to avoid port chuffing?
Xmax is not published for Audio System HX 08 EVO, so the port is an empirical estimate: a 10.0 cm diameter with a length of 99.0 cm (area at least 12 in² per ft³ of net volume). Check the air velocity at your power level in Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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