Hertz HMS 10 B4 LD C
Best box: 29.6 L bass reflex tuned to 34.9 Hz · F3 49.9 Hz
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Comparable 10.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Hertz HMS 10 B4 LD C 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 (58.1 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) | 29.6 Liters |
| Tuning Frequency (Fb) | 34.9 Hz |
| F3 (-3 dB Cutoff) | 49.9 Hz |
| F6 / F10 Extension | 41.4 Hz / 31.8 Hz |
| Port Inner Diameter | Ø 10.0 cm |
| Port Physical Length | 58.1 cm |
| First Pipe Resonance | 296.0 Hz |
| Estimated MOL @ F3 | 118.4 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.71 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.004; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 37.0 Liters |
| System Q (Qtc) | 1.004 (above Butterworth: Qtc cannot fall below Qts (0.71)) |
| System Resonance (Fc) | 58.0 Hz |
| F3 (-3 dB Cutoff) | 48.5 Hz |
| F6 / F10 Extension | 40.0 Hz / 32.0 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 41.0 Hz |
| Total Q (Qts) | 0.71 |
| Electrical Q (Qes) | 0.759 |
| Mechanical Q (Qms) | 11.0 |
| Equivalent Volume (Vas) | 37.0 Liters |
| Diaphragm Area (Sd) | 347.0 cm² |
| DC Resistance (Re) | 4.5 Ω |
| Efficiency Bandwidth Product (EBP) | 54.0 |
| Linear Excursion (Xmax) | 13.5 mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 10.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Hertz HMS 10 B4 LD C?
Load Forge's calculated alignment puts Hertz HMS 10 B4 LD C in a 29.6 liter vented enclosure tuned to 34.9 Hz, reaching an F3 cutoff of approximately 49.9 Hz.
Can Hertz HMS 10 B4 LD C be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 37.0 liters with a Qtc of 1.004 (above Butterworth: Qtc cannot fall below Qts (0.71)), the system exhibits an F3 of 48.5 Hz.
What port dimensions should be used for Hertz HMS 10 B4 LD C to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 10.0 cm with a length of 58.1 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
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