Celestion TSQ1545
Best box: 67.3 L bass reflex tuned to 50.6 Hz · F3 48.7 Hz
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Comparable 15.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Celestion TSQ1545 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 (67.3 L at 42.2 Hz) would need a 64.3 cm port; the recommendation is retuned to 67.3 L at 50.6 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 67.3 Liters |
| Tuning Frequency (Fb) | 50.6 Hz |
| F3 (-3 dB Cutoff) | 48.7 Hz |
| F6 / F10 Extension | 44.1 Hz / 39.1 Hz |
| Port Inner Diameter | Ø 20.0 cm |
| Port Physical Length | 40.4 cm |
| First Pipe Resonance | 426.0 Hz |
| Estimated MOL @ F3 | 124.4 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 29.7 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 76.5 Hz |
| F3 (-3 dB Cutoff) | 77.6 Hz |
| F6 / F10 Extension | 58.4 Hz / 44.0 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 39.0 Hz |
| Total Q (Qts) | 0.349 |
| Electrical Q (Qes) | 0.372 |
| Mechanical Q (Qms) | 5.61 |
| Equivalent Volume (Vas) | 92.0 Liters |
| Diaphragm Area (Sd) | 855.3 cm² |
| DC Resistance (Re) | 5.05 Ω |
| Efficiency Bandwidth Product (EBP) | 104.8 |
| Linear Excursion (Xmax) | 16.0 mm |
| Thermal Power (Pe) | 1800.0 W |
| Nominal Diameter | 15.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Celestion TSQ1545?
Load Forge's calculated alignment puts Celestion TSQ1545 in a 67.3 liter vented enclosure tuned to 50.6 Hz, reaching an F3 cutoff of approximately 48.7 Hz.
Can Celestion TSQ1545 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 29.7 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 77.6 Hz.
What port dimensions should be used for Celestion TSQ1545 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 20.0 cm with a length of 40.4 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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