Celestion TFX0515-16
Best box: 3.2 L bass reflex tuned to 74.8 Hz · F3 122.5 Hz
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Comparable 5.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Celestion TFX0515-16 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 (1.6 L at 93.5 Hz) would need a 38.5 cm port; the recommendation is retuned to 3.2 L at 74.8 Hz so the port can be built.
- Limited linear excursion (Xmax: 3.75 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) | 3.2 Liters |
| Tuning Frequency (Fb) | 74.8 Hz |
| F3 (-3 dB Cutoff) | 122.5 Hz |
| F6 / F10 Extension | 100.3 Hz / 72.9 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 29.3 cm |
| First Pipe Resonance | 587.0 Hz |
| Estimated MOL @ F3 | 110.0 dB SPL |
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) | 2.0 Liters |
| System Q (Qtc) | 1.131 (above Butterworth: Qtc cannot fall below Qts (0.80)) |
| System Resonance (Fc) | 155.6 Hz |
| F3 (-3 dB Cutoff) | 142.1 Hz |
| F6 / F10 Extension | 120.4 Hz / 98.5 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 110.0 Hz |
| Total Q (Qts) | 0.8 |
| Electrical Q (Qes) | 0.847 |
| Mechanical Q (Qms) | 14.33 |
| Equivalent Volume (Vas) | 2.0 Liters |
| Diaphragm Area (Sd) | 95.0 cm² |
| DC Resistance (Re) | 10.18 Ω |
| Efficiency Bandwidth Product (EBP) | 129.8 |
| Linear Excursion (Xmax) | 3.8 mm |
| Thermal Power (Pe) | 150.0 W |
| Nominal Diameter | 5.5" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Celestion TFX0515-16?
Load Forge's calculated alignment puts Celestion TFX0515-16 in a 3.2 liter vented enclosure tuned to 74.8 Hz, reaching an F3 cutoff of approximately 122.5 Hz.
Can Celestion TFX0515-16 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 2.0 liters with a Qtc of 1.131 (above Butterworth: Qtc cannot fall below Qts (0.80)), the system exhibits an F3 of 142.1 Hz.
What port dimensions should be used for Celestion TFX0515-16 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 29.3 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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