CT Sounds THERMO-15 // 1500 Watts RMS 15 Inch SPL Car Subwoofer
Best box: 60.3 L bass reflex tuned to 27.4 Hz · F3 25.5 Hz
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Comparable 15.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the CT Sounds THERMO-15 // 1500 Watts RMS 15 Inch SPL Car Subwoofer 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
- Port length (72.3 cm) exceeds a straight internal run; use an elbow bend, slotted vent or 3D folded duct to fit the enclosure.
Recommended Bass Reflex (Vented)
PORT NEEDS ELBOW / 3D| Net Box Volume (Vb) | 60.3 Liters |
| Tuning Frequency (Fb) | 27.4 Hz |
| F3 (-3 dB Cutoff) | 25.5 Hz |
| F6 / F10 Extension | 22.9 Hz / 20.5 Hz |
| Port Inner Diameter | Ø 12.5 cm |
| Port Physical Length | 72.3 cm |
| First Pipe Resonance | 238.0 Hz |
| Estimated MOL @ F3 | 88.0 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 27.0 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 49.5 Hz |
| F3 (-3 dB Cutoff) | 50.7 Hz |
| F6 / F10 Extension | 38.2 Hz / 28.8 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 31.7 Hz |
| Total Q (Qts) | 0.449 |
| Electrical Q (Qes) | 0.474 |
| Mechanical Q (Qms) | 8.44 |
| Equivalent Volume (Vas) | 40.0 Liters |
| Diaphragm Area (Sd) | 855.0 cm² |
| DC Resistance (Re) | 4.0 Ω |
| Efficiency Bandwidth Product (EBP) | 66.9 |
| Linear Excursion (Xmax) | 12.0 mm |
| Thermal Power (Pe) | 3.0 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 CT Sounds THERMO-15 // 1500 Watts RMS 15 Inch SPL Car Subwoofer?
Load Forge's calculated alignment puts CT Sounds THERMO-15 // 1500 Watts RMS 15 Inch SPL Car Subwoofer in a 60.3 liter vented enclosure tuned to 27.4 Hz, reaching an F3 cutoff of approximately 25.5 Hz.
Can CT Sounds THERMO-15 // 1500 Watts RMS 15 Inch SPL Car Subwoofer be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 27.0 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 50.7 Hz.
What port dimensions should be used for CT Sounds THERMO-15 // 1500 Watts RMS 15 Inch SPL Car Subwoofer to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 12.5 cm with a length of 72.3 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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