Celestion 4-inch
Best box: 1.7 L bass reflex tuned to 89.0 Hz · F3 130.7 Hz
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Comparable 4.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Celestion 4-inch 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: 2.75 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) | 1.7 Liters |
| Tuning Frequency (Fb) | 89.0 Hz |
| F3 (-3 dB Cutoff) | 130.7 Hz |
| F6 / F10 Extension | 109.9 Hz / 85.3 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 40.1 cm |
| First Pipe Resonance | 429.0 Hz |
| Estimated MOL @ F3 | 102.3 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.807 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.141; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 2.1 Liters |
| System Q (Qtc) | 1.141 (above Butterworth: Qtc cannot fall below Qts (0.81)) |
| System Resonance (Fc) | 148.1 Hz |
| F3 (-3 dB Cutoff) | 122.3 Hz |
| F6 / F10 Extension | 102.5 Hz / 83.1 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 104.7 Hz |
| Total Q (Qts) | 0.807 |
| Electrical Q (Qes) | 0.952 |
| Mechanical Q (Qms) | 5.31 |
| Equivalent Volume (Vas) | 2.1 Liters |
| Diaphragm Area (Sd) | 56.8 cm² |
| DC Resistance (Re) | 10.37 Ω |
| Efficiency Bandwidth Product (EBP) | 110.0 |
| Linear Excursion (Xmax) | 2.8 mm |
| Thermal Power (Pe) | 35.0 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 Celestion 4-inch?
Load Forge's calculated alignment puts Celestion 4-inch in a 1.7 liter vented enclosure tuned to 89.0 Hz, reaching an F3 cutoff of approximately 130.7 Hz.
Can Celestion 4-inch be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 2.1 liters with a Qtc of 1.141 (above Butterworth: Qtc cannot fall below Qts (0.81)), the system exhibits an F3 of 122.3 Hz.
What port dimensions should be used for Celestion 4-inch to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 40.1 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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