Celestion FTR18-4080FD
Best box: 168.8 L bass reflex tuned to 32.7 Hz · F3 34.6 Hz
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Comparable 18.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Celestion FTR18-4080FD 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
- Large enclosure volume (168.8 L) requires extensive internal matrix bracing to prevent panel resonance.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 168.8 Liters |
| Tuning Frequency (Fb) | 32.7 Hz |
| F3 (-3 dB Cutoff) | 34.6 Hz |
| F6 / F10 Extension | 30.1 Hz / 26.1 Hz |
| Port Inner Diameter | Ø 12.5 cm |
| Port Physical Length | 11.4 cm |
| First Pipe Resonance | 1503.0 Hz |
| Estimated MOL @ F3 | 121.4 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 80.0 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 59.1 Hz |
| F3 (-3 dB Cutoff) | 60.9 Hz |
| F6 / F10 Extension | 45.6 Hz / 34.3 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 25.2 Hz |
| Total Q (Qts) | 0.286 |
| Electrical Q (Qes) | 0.304 |
| Mechanical Q (Qms) | 4.75 |
| Equivalent Volume (Vas) | 408.7 Liters |
| Diaphragm Area (Sd) | 1134.1 cm² |
| DC Resistance (Re) | 5.62 Ω |
| Efficiency Bandwidth Product (EBP) | 82.8 |
| Linear Excursion (Xmax) | 8.5 mm |
| Thermal Power (Pe) | 1000.0 W |
| Nominal Diameter | 18.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Celestion FTR18-4080FD?
Load Forge's calculated alignment puts Celestion FTR18-4080FD in a 168.8 liter vented enclosure tuned to 32.7 Hz, reaching an F3 cutoff of approximately 34.6 Hz.
Can Celestion FTR18-4080FD be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 80.0 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 60.9 Hz.
What port dimensions should be used for Celestion FTR18-4080FD to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 12.5 cm with a length of 11.4 cm is suggested; check the port air velocity at your drive level in the 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.
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