CT Sounds STRATO-15 // 1250 Watts RMS 15 Inch Car Subwoofer
Best box: 94.3 L bass reflex tuned to 19.7 Hz · F3 25.6 Hz
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Comparable 15.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the CT Sounds STRATO-15 // 1250 Watts RMS 15 Inch 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 (57.2 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) | 94.3 Liters |
| Tuning Frequency (Fb) | 19.7 Hz |
| F3 (-3 dB Cutoff) | 25.6 Hz |
| F6 / F10 Extension | 18.1 Hz / 15.1 Hz |
| Port Inner Diameter | Ø 10.0 cm |
| Port Physical Length | 57.2 cm |
| First Pipe Resonance | 301.0 Hz |
| Estimated MOL @ F3 | 87.7 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 129.4 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 34.0 Hz |
| F3 (-3 dB Cutoff) | 34.5 Hz |
| F6 / F10 Extension | 26.1 Hz / 19.7 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 28.2 Hz |
| Total Q (Qts) | 0.58 |
| Electrical Q (Qes) | 0.635 |
| Mechanical Q (Qms) | 6.67 |
| Equivalent Volume (Vas) | 62.9 Liters |
| Diaphragm Area (Sd) | 855.0 cm² |
| DC Resistance (Re) | 0.98 Ω |
| Efficiency Bandwidth Product (EBP) | 44.4 |
| 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 STRATO-15 // 1250 Watts RMS 15 Inch Car Subwoofer?
Load Forge's calculated alignment puts CT Sounds STRATO-15 // 1250 Watts RMS 15 Inch Car Subwoofer in a 94.3 liter vented enclosure tuned to 19.7 Hz, reaching an F3 cutoff of approximately 25.6 Hz.
Can CT Sounds STRATO-15 // 1250 Watts RMS 15 Inch Car Subwoofer be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 129.4 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 34.5 Hz.
What port dimensions should be used for CT Sounds STRATO-15 // 1250 Watts RMS 15 Inch Car Subwoofer to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 10.0 cm with a length of 57.2 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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Not sure if STRATO-15 // 1250 Watts RMS 15 Inch Car Subwoofer fits your physical space?
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