Hertz HMX 8 8 S LD SW 2
Best box: 44.2 L bass reflex tuned to 40.2 Hz · F3 41.0 Hz
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Comparable 8.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Hertz HMX 8 8 S LD SW 2 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 (44.2 L at 35.0 Hz) would need a 59.0 cm port; the recommendation is retuned to 44.2 L at 40.2 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.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 44.2 Liters |
| Tuning Frequency (Fb) | 40.2 Hz |
| F3 (-3 dB Cutoff) | 41.0 Hz |
| F6 / F10 Extension | 34.4 Hz / 30.0 Hz |
| Port Inner Diameter ESTIMATED | Ø 12.5 cm |
| Port Physical Length | 42.6 cm |
| First Pipe Resonance | 404.0 Hz |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 60.6 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 59.0 Hz |
| F3 (-3 dB Cutoff) | 59.7 Hz |
| F6 / F10 Extension | 45.2 Hz / 34.2 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 50.0 Hz |
| Total Q (Qts) | 0.58 |
| Electrical Q (Qes) | 0.612 |
| Mechanical Q (Qms) | 11.0 |
| Equivalent Volume (Vas) | 29.5 Liters |
| Diaphragm Area (Sd) | 238.8 cm² |
| DC Resistance (Re) | 3.1 Ω |
| Efficiency Bandwidth Product (EBP) | 81.7 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 8.5" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Hertz HMX 8 8 S LD SW 2?
Load Forge's calculated alignment puts Hertz HMX 8 8 S LD SW 2 in a 44.2 liter vented enclosure tuned to 40.2 Hz, reaching an F3 cutoff of approximately 41.0 Hz.
Can Hertz HMX 8 8 S LD SW 2 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 60.6 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 59.7 Hz.
What port dimensions should be used for Hertz HMX 8 8 S LD SW 2 to avoid port chuffing?
Xmax is not published for Hertz HMX 8 8 S LD SW 2, so the port is an empirical estimate: a 12.5 cm diameter with a length of 42.6 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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