Hertz C 165 F
Best box: 7.5 L bass reflex tuned to 68.0 Hz · F3 99.4 Hz
Open and tweak this box live ↗
Will it fit your requirements?
Check the Hertz C 165 F against your space and targets — instant, no sign-up.
Free, no sign-up to simulate · a free account saves your design
Comparable 7.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Hertz C 165 F 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) | 7.5 Liters |
| Tuning Frequency (Fb) | 68.0 Hz |
| F3 (-3 dB Cutoff) | 99.4 Hz |
| F6 / F10 Extension | 83.8 Hz / 65.3 Hz |
| Port Inner Diameter ESTIMATED | Ø 6.8 cm |
| Port Physical Length | 26.5 cm |
| First Pipe Resonance | 648.0 Hz |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.8 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.131; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 9.4 Liters |
| System Q (Qtc) | 1.131 (above Butterworth: Qtc cannot fall below Qts (0.80)) |
| System Resonance (Fc) | 113.1 Hz |
| F3 (-3 dB Cutoff) | 92.5 Hz |
| F6 / F10 Extension | 77.6 Hz / 63.0 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 80.0 Hz |
| Total Q (Qts) | 0.8 |
| Electrical Q (Qes) | 1.046 |
| Mechanical Q (Qms) | 3.4 |
| Equivalent Volume (Vas) | 9.4 Liters |
| Diaphragm Area (Sd) | 142.8 cm² |
| DC Resistance (Re) | 2.7 Ω |
| Efficiency Bandwidth Product (EBP) | 76.5 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 7.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Hertz C 165 F?
Load Forge's calculated alignment puts Hertz C 165 F in a 7.5 liter vented enclosure tuned to 68.0 Hz, reaching an F3 cutoff of approximately 99.4 Hz.
Can Hertz C 165 F be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 9.4 liters with a Qtc of 1.131 (above Butterworth: Qtc cannot fall below Qts (0.80)), the system exhibits an F3 of 92.5 Hz.
What port dimensions should be used for Hertz C 165 F to avoid port chuffing?
Xmax is not published for Hertz C 165 F, so the port is an empirical estimate: a 6.8 cm diameter with a length of 26.5 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
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.
Not sure if C 165 F fits your physical space?
Don't force a driver into the wrong box. Use Bass Match to calculate which of 8,000+ catalog drivers delivers the highest SPL, lowest F3, and cleanest port air velocity for your exact trunk or room dimensions.
Run Bass Match for Your Space