Hertz HEX 6 5 M
Best box: 5.2 L bass reflex tuned to 66.3 Hz · F3 97.6 Hz
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Comparable 6.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Hertz HEX 6 5 M 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
- 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) | 5.2 Liters |
| Tuning Frequency (Fb) | 66.3 Hz |
| F3 (-3 dB Cutoff) | 97.6 Hz |
| F6 / F10 Extension | 82.3 Hz / 64.2 Hz |
| Port Inner Diameter ESTIMATED | Ø 5.0 cm |
| Port Physical Length | 22.2 cm |
| First Pipe Resonance | 776.0 Hz |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.82 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.16; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 6.5 Liters |
| System Q (Qtc) | 1.16 (above Butterworth: Qtc cannot fall below Qts (0.82)) |
| System Resonance (Fc) | 110.3 Hz |
| F3 (-3 dB Cutoff) | 90.8 Hz |
| F6 / F10 Extension | 76.2 Hz / 61.9 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 78.0 Hz |
| Total Q (Qts) | 0.82 |
| Electrical Q (Qes) | 0.947 |
| Mechanical Q (Qms) | 6.1 |
| Equivalent Volume (Vas) | 6.5 Liters |
| Diaphragm Area (Sd) | 122.7 cm² |
| DC Resistance (Re) | 3.3 Ω |
| Efficiency Bandwidth Product (EBP) | 82.3 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 6.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Hertz HEX 6 5 M?
Load Forge's calculated alignment puts Hertz HEX 6 5 M in a 5.2 liter vented enclosure tuned to 66.3 Hz, reaching an F3 cutoff of approximately 97.6 Hz.
Can Hertz HEX 6 5 M be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 6.5 liters with a Qtc of 1.16 (above Butterworth: Qtc cannot fall below Qts (0.82)), the system exhibits an F3 of 90.8 Hz.
What port dimensions should be used for Hertz HEX 6 5 M to avoid port chuffing?
Xmax is not published for Hertz HEX 6 5 M, so the port is an empirical estimate: a 5.0 cm diameter with a length of 22.2 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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