Dayton Audio CF120-4 4-1/2" Woven Carbon Fiber Midwoofer 4 O
Best box: 1.9 L bass reflex tuned to 80.8 Hz · F3 80.7 Hz
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Comparable 4.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Dayton Audio CF120-4 4-1/2" Woven Carbon Fiber Midwoofer 4 O 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 (1.9 L at 70.3 Hz) would need a 59.1 cm port; the recommendation is retuned to 1.9 L at 80.8 Hz so the port can be built.
- Limited linear excursion (Xmax: 3.5 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 1.9 Liters |
| Tuning Frequency (Fb) | 80.8 Hz |
| F3 (-3 dB Cutoff) | 80.7 Hz |
| F6 / F10 Extension | 72.1 Hz / 63.2 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 43.9 cm |
| First Pipe Resonance | 392.0 Hz |
| Estimated MOL @ F3 | 97.1 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 0.9 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 132.5 Hz |
| F3 (-3 dB Cutoff) | 126.1 Hz |
| F6 / F10 Extension | 96.7 Hz / 73.1 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 53.2 Hz |
| Total Q (Qts) | 0.28 |
| Electrical Q (Qes) | 0.329 |
| Mechanical Q (Qms) | 1.89 |
| Equivalent Volume (Vas) | 4.8 Liters |
| Diaphragm Area (Sd) | 51.2 cm² |
| DC Resistance (Re) | 3.4 Ω |
| Efficiency Bandwidth Product (EBP) | 161.9 |
| Linear Excursion (Xmax) | 3.5 mm |
| Thermal Power (Pe) | 30.0 W |
| Nominal Diameter | 4.5" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Dayton Audio CF120-4 4-1/2" Woven Carbon Fiber Midwoofer 4 O?
Load Forge's calculated alignment puts Dayton Audio CF120-4 4-1/2" Woven Carbon Fiber Midwoofer 4 O in a 1.9 liter vented enclosure tuned to 80.8 Hz, reaching an F3 cutoff of approximately 80.7 Hz.
Can Dayton Audio CF120-4 4-1/2" Woven Carbon Fiber Midwoofer 4 O be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.9 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 126.1 Hz.
What port dimensions should be used for Dayton Audio CF120-4 4-1/2" Woven Carbon Fiber Midwoofer 4 O to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 43.9 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
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