Stereo Integrity SQL-12 D2
Best box: 77.5 L bass reflex tuned to 21.0 Hz · F3 19.9 Hz
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Comparable 12.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Stereo Integrity SQL-12 D2 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 (98.7 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) | 77.5 Liters |
| Tuning Frequency (Fb) | 21.0 Hz |
| F3 (-3 dB Cutoff) | 19.9 Hz |
| F6 / F10 Extension | 17.8 Hz / 15.8 Hz |
| Port Inner Diameter | Ø 12.5 cm |
| Port Physical Length | 98.7 cm |
| First Pipe Resonance | 174.0 Hz |
| Estimated MOL @ F3 | 110.9 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 34.2 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 38.1 Hz |
| F3 (-3 dB Cutoff) | 39.2 Hz |
| F6 / F10 Extension | 29.5 Hz / 22.2 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 23.4 Hz |
| Total Q (Qts) | 0.43 |
| Electrical Q (Qes) | 0.469 |
| Mechanical Q (Qms) | 5.2 |
| Equivalent Volume (Vas) | 58.2 Liters |
| Diaphragm Area (Sd) | 510.0 cm² |
| DC Resistance (Re) | 3.8 Ω |
| Efficiency Bandwidth Product (EBP) | 49.9 |
| Linear Excursion (Xmax) | 28.0 mm |
| Thermal Power (Pe) | 1000.0 W |
| Nominal Diameter | 12.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Stereo Integrity SQL-12 D2?
Load Forge's calculated alignment puts Stereo Integrity SQL-12 D2 in a 77.5 liter vented enclosure tuned to 21.0 Hz, reaching an F3 cutoff of approximately 19.9 Hz.
Can Stereo Integrity SQL-12 D2 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 34.2 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 39.2 Hz.
What port dimensions should be used for Stereo Integrity SQL-12 D2 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 12.5 cm with a length of 98.7 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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