Dayton Audio CX120-8 4" Coaxial Driver with 3/4" Silk Dome Tweeter 8 Ohm
Best box: 4.5 L bass reflex tuned to 71.1 Hz · F3 66.3 Hz
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Comparable 4.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Dayton Audio CX120-8 4" Coaxial Driver with 3/4" Silk Dome Tweeter 8 Ohm 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
- Limited linear excursion (Xmax: 3.0 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) | 4.5 Liters |
| Tuning Frequency (Fb) | 71.1 Hz |
| F3 (-3 dB Cutoff) | 66.3 Hz |
| F6 / F10 Extension | 59.2 Hz / 52.7 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 22.3 cm |
| First Pipe Resonance | 771.0 Hz |
| Estimated MOL @ F3 | 99.5 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 2.6 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 126.4 Hz |
| F3 (-3 dB Cutoff) | 118.3 Hz |
| F6 / F10 Extension | 90.2 Hz / 68.5 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 87.5 Hz |
| Total Q (Qts) | 0.48 |
| Electrical Q (Qes) | 0.576 |
| Mechanical Q (Qms) | 2.89 |
| Equivalent Volume (Vas) | 3.0 Liters |
| Diaphragm Area (Sd) | 52.5 cm² |
| DC Resistance (Re) | 6.22 Ω |
| Efficiency Bandwidth Product (EBP) | 152.0 |
| Linear Excursion (Xmax) | 3.0 mm |
| Thermal Power (Pe) | 40.0 W |
| Nominal Diameter | 4.0" |
| 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 CX120-8 4" Coaxial Driver with 3/4" Silk Dome Tweeter 8 Ohm?
Load Forge's calculated alignment puts Dayton Audio CX120-8 4" Coaxial Driver with 3/4" Silk Dome Tweeter 8 Ohm in a 4.5 liter vented enclosure tuned to 71.1 Hz, reaching an F3 cutoff of approximately 66.3 Hz.
Can Dayton Audio CX120-8 4" Coaxial Driver with 3/4" Silk Dome Tweeter 8 Ohm be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 2.6 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 118.3 Hz.
What port dimensions should be used for Dayton Audio CX120-8 4" Coaxial Driver with 3/4" Silk Dome Tweeter 8 Ohm to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 22.3 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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Not sure if CX120-8 4" Coaxial Driver with 3/4" Silk Dome Tweeter 8 Ohm fits your physical space?
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